The document provides an introduction to Visual Basic programming fundamentals including modules, data types, variables, operators, and functions. It discusses the different types of modules that can contain code in Visual Basic. It also describes the various data types like numeric, string, date, and boolean. Additionally, it covers variable declaration and scope, as well as the different types of operators and built-in functions available in Visual Basic.
Interfaces are reference types that define a contract that other classes can implement. Interfaces cannot contain fields or constructors, and all members are implicitly public and abstract. A class can implement multiple interfaces, allowing it to inherit functionality from different sources, while only being able to inherit from one base class. Explicit interface implementation allows a class to implement the same method signature defined in multiple interfaces to avoid name collisions.
This document discusses variables and data types in software design and development. It explains that variables must be declared with a name and data type depending on the kind of value they will hold. The document then describes several common basic data types including string, boolean, decimal, short, integer, single, and double. It provides the ranges and storage sizes for each data type. The document also discusses naming conventions for variables, using prefixes to indicate data type, and defines constants.
An interface defines a contract that specifies functionality without implementation. It defines a set of methods that classes implement. Interfaces allow for multiple inheritance by allowing a class to implement multiple interfaces. Interfaces cannot contain data members, constructors, destructors, or static members. Both interfaces and abstract classes cannot be instantiated but interfaces only define method signatures while abstract classes can contain implementations. A class implements an interface by listing the interface name after the class name and providing implementations for all interface methods.
This document discusses classes, objects, and methods in Java. It defines a class as a user-defined data type that contains fields and methods. Objects are instances of classes that allocate memory at runtime. Methods define behaviors for objects and are declared within classes. The document covers defining classes, creating objects, accessing members, constructors, method overloading and overriding, static members, passing objects as parameters, recursion, and visibility control.
The document discusses functions in C programming. The key points are:
1. A function is a block of code that performs a specific task. Functions allow code reusability and modularity.
2. main() is the starting point of a C program where execution begins. User-defined functions are called from main() or other functions.
3. Functions can take arguments and return values. There are different ways functions can be defined based on these criteria.
4. Variables used within a function have local scope while global variables can be accessed from anywhere. Pointers allow passing arguments by reference.
Visual Basic .NET (VB.NET or VB .NET) is a version of Microsoft's Visual Basic that was designed, as part of the company's .NET product group, to make Web services applications easier to develop.
This document defines object-oriented programming and compares it to structured programming. It outlines the main principles of OOP including encapsulation, abstraction, inheritance, and polymorphism. Encapsulation binds code and data together for security and consistency. Abstraction hides implementation details and provides functionality. Inheritance allows classes to acquire properties from other classes in a hierarchy. Polymorphism enables different types to perform the same methods.
Programming involves developing programs by specifying computational steps in a programming language. An algorithm is a logical list of steps to solve a problem. Developing good algorithms involves specifying clear input/output, variables, and ensuring the algorithm terminates in a finite number of steps. Flowcharts provide a pictorial representation of algorithm steps and are useful for explaining programs. A computer program consists of instructions provided to the computer to solve a problem.
Interfaces are reference types that define a contract that other classes can implement. Interfaces cannot contain fields or constructors, and all members are implicitly public and abstract. A class can implement multiple interfaces, allowing it to inherit functionality from different sources, while only being able to inherit from one base class. Explicit interface implementation allows a class to implement the same method signature defined in multiple interfaces to avoid name collisions.
This document discusses variables and data types in software design and development. It explains that variables must be declared with a name and data type depending on the kind of value they will hold. The document then describes several common basic data types including string, boolean, decimal, short, integer, single, and double. It provides the ranges and storage sizes for each data type. The document also discusses naming conventions for variables, using prefixes to indicate data type, and defines constants.
An interface defines a contract that specifies functionality without implementation. It defines a set of methods that classes implement. Interfaces allow for multiple inheritance by allowing a class to implement multiple interfaces. Interfaces cannot contain data members, constructors, destructors, or static members. Both interfaces and abstract classes cannot be instantiated but interfaces only define method signatures while abstract classes can contain implementations. A class implements an interface by listing the interface name after the class name and providing implementations for all interface methods.
This document discusses classes, objects, and methods in Java. It defines a class as a user-defined data type that contains fields and methods. Objects are instances of classes that allocate memory at runtime. Methods define behaviors for objects and are declared within classes. The document covers defining classes, creating objects, accessing members, constructors, method overloading and overriding, static members, passing objects as parameters, recursion, and visibility control.
The document discusses functions in C programming. The key points are:
1. A function is a block of code that performs a specific task. Functions allow code reusability and modularity.
2. main() is the starting point of a C program where execution begins. User-defined functions are called from main() or other functions.
3. Functions can take arguments and return values. There are different ways functions can be defined based on these criteria.
4. Variables used within a function have local scope while global variables can be accessed from anywhere. Pointers allow passing arguments by reference.
Visual Basic .NET (VB.NET or VB .NET) is a version of Microsoft's Visual Basic that was designed, as part of the company's .NET product group, to make Web services applications easier to develop.
This document defines object-oriented programming and compares it to structured programming. It outlines the main principles of OOP including encapsulation, abstraction, inheritance, and polymorphism. Encapsulation binds code and data together for security and consistency. Abstraction hides implementation details and provides functionality. Inheritance allows classes to acquire properties from other classes in a hierarchy. Polymorphism enables different types to perform the same methods.
Programming involves developing programs by specifying computational steps in a programming language. An algorithm is a logical list of steps to solve a problem. Developing good algorithms involves specifying clear input/output, variables, and ensuring the algorithm terminates in a finite number of steps. Flowcharts provide a pictorial representation of algorithm steps and are useful for explaining programs. A computer program consists of instructions provided to the computer to solve a problem.
The document provides an overview of Visual Basic 6 and its integrated development environment (IDE). It discusses the history of programming languages and how Visual Basic fits as an event-driven language. It then covers the key components of the Visual Basic IDE, including the toolbox, properties window, and how to attach event handlers to controls. Examples are provided of common events like mouse clicks and key presses. The document is intended as an introduction for developers to Visual Basic 6.
This document provides an introduction to the C++ programming language. It discusses what C++ is, its origins as an extension of the C language, and some key concepts in C++ programs. These include variables, data types, functions, input/output statements, and a simple example program. The document then demonstrates arithmetic, relational, and logical operations and examines pseudocode as a way to design algorithms before coding. Decision statements and flowcharts are introduced as tools for programming logic and conditional execution.
This document discusses methods in C#, including how they are declared, invoked, and used. It covers key concepts like the main method, passing parameters by value and reference, output parameters, variable argument lists, and method overloading. Methods are declared inside classes and give objects their behavioral characteristics by allowing processing of data and responses to messages from other objects. The main method is the starting point of all C# programs and must be static. Parameters can be passed by value or reference, and output parameters pass results back using the out keyword. Variable argument lists use params arrays, and overloading methods have the same name but different parameters.
This document provides an overview of basic object-oriented programming (OOP) concepts including objects, classes, inheritance, polymorphism, encapsulation, and data abstraction. It defines objects as entities with both data (characteristics) and behavior (operations). Classes are blueprints that are used to create objects. Inheritance allows objects to inherit properties from parent classes. Polymorphism allows code to take different forms. Encapsulation wraps data and functions into classes, hiding information. Data abstraction focuses on important descriptions without details.
This document assigns a group project on data types in C++ to seven students. It discusses the three main data types in C++ - character, integer, and float. Character data can store single characters, integer data stores whole numbers, and float data stores numeric values with decimals. It also covers variable declaration and initialization in C++, noting that variables must be declared before use and can be initialized with a value upon declaration. The document assigns different aspects of the data types topic to the seven students listed at the top for further explanation in the project.
Constructor and destructor are special types of methods in object-oriented programming. Constructors are used to initialize objects and are called when an object is created, while destructors are used to destroy objects and are called when an object is deleted or goes out of scope. There are different types of constructors like default, parameterized, and copy constructors. Constructors cannot be inherited or virtual. Destructors are used to clean up resources used by an object and are called automatically when an object is destroyed. The key differences between constructors and destructors are that constructors initialize objects and can have parameters, while destructors destroy objects and have no parameters.
The document discusses namespaces in .NET. Namespaces help organize classes and interfaces logically and avoid naming conflicts. Namespaces use dot notation and can be defined using the namespace keyword. Assemblies contain namespaces and provide execution context and versioning. Private assemblies are used within one application while public assemblies in the global assembly cache can be used across applications. The compiler compiles to CIL and produces metadata. The runtime loads assemblies and the JIT compiler converts CIL to native code for the CPU.
ADO.NET is a set of libraries included with the .NET Framework that help communicate with various data stores from .NET applications. The ADO.NET libraries include classes for connecting to a data source, submitting queries, and processing results. ADO.NET also allows for disconnected data access using objects like the DataSet which allows data to be cached and edited offline. The core ADO.NET objects include connections, commands, data readers, data adapters and data sets which provide functionality similar to but also improvements over ADO.
This document provides an introduction to Visual Basic (VB). It describes VB as an evolved version of BASIC that is visual and event-driven. The VB environment contains a blank form window to design interfaces, a project window to view files, and a toolbox of controls. It also explains how to create a standard executable program in VB and describes the main components of the VB environment.
The document provides an introduction to control structures and programming concepts in Visual Basic, including decision making statements, looping statements, arrays, functions, procedures, and control arrays. It discusses various conditional structures like if-then and select-case statements. It also covers different types of loops like for-next loops and do-while loops. The use of arrays, both fixed-size and dynamic, in VB programming is explained. Finally, it discusses various built-in functions and different types of procedures in Visual Basic.
The .NET Framework is a software platform that allows developers to write and run applications and web services in any compliant language. It provides a common language runtime and class libraries. Applications are compiled to an intermediate language (IL) that is then compiled to native machine code by the common language runtime (CLR). The CLR handles memory management, security, and other low-level tasks. The .NET Framework supports multiple programming languages and tools like Visual Studio. It allows building Windows forms applications, web applications with ASP.NET, and web services.
Pointer arithmetic allows limited operations on pointers like incrementing, decrementing, addition and subtraction. When a pointer is incremented or decremented, its value changes by the size of the data type. Pointers store addresses, so adding two addresses is illegal as there is no meaning to the result. Subtracting pointers yields the offset between the two addresses. Operations like addition, subtraction on a pointer changes its value based on the data type size. Certain operations like addition of two addresses are illegal for pointers.
This document discusses the five main types of tokens in C++ - keywords, variables, constants, strings, and operators. It provides definitions and examples of each token type. Keywords are reserved words that cannot be used as variable names, while variables store values that can change. Constants represent fixed values, strings group characters within double quotes, and operators perform actions on operands like arithmetic, comparison, and assignment.
Data types in C include primary (fundamental) types like integers and floating-point numbers, as well as derived and user-defined types. Primary types include integers of various sizes (char, short, int, long) that can be signed or unsigned, and floating-point types like float, double, and long double. Integer types have size and value ranges that depend on the machine, such as 8-bit char from -128 to 127. Floating-point types have prescribed sizes and precision levels. User can define their own types using typedef to create new type names, or enum to define enumeration types with named values.
This document provides an overview of C# program structure and key concepts like namespaces, classes, structs, interfaces, enumerations, delegates, and abstract classes. It defines each concept, provides examples, and explains when to use each one and how they relate to each other. Namespaces help organize code, classes and structs define custom types, interfaces define common functionality, enumerations define named constants, delegates define callbacks, and abstract classes define common traits.
Introduction, Array of structure, Passing structure to function, Passing array of structure to function, Structure within structure ( Nested Structure), Union, Pointer to structure
This document provides an overview of control structures in Visual Basic. It describes the three types of control structures: sequence, selection, and iteration. Sequence refers to the default sequential execution of statements. Selection structures like If/Then/Else and Select Case allow branching program execution based on conditions. Iteration structures like For/Next loops and Do/Loop statements allow repeating a block of code until a condition is met. The document provides details and syntax examples for If/Then/Else, Select Case, For/Next loops, and Do/Loop in Visual Basic.
This document provides an introduction to Visual Basic programming concepts including data types, variables, operators, and functions. It discusses the different data types in Visual Basic like numeric, string, date, and boolean. It describes how variables are declared and the different scopes they can have. The document also covers operators like arithmetic, relational, and logical operators. Finally, it discusses built-in functions in Visual Basic for working with dates, strings, numbers, and converting between data types.
The document discusses using variables and constants in VBA code. It covers declaring variables and constants, specifying data types, naming conventions, assigning values, and different scopes including disposable, local, and global. It emphasizes declaring all variables at the top of procedures or modules and assigning values after declarations. Structuring code in a logical order is also discussed.
The document provides an overview of Visual Basic 6 and its integrated development environment (IDE). It discusses the history of programming languages and how Visual Basic fits as an event-driven language. It then covers the key components of the Visual Basic IDE, including the toolbox, properties window, and how to attach event handlers to controls. Examples are provided of common events like mouse clicks and key presses. The document is intended as an introduction for developers to Visual Basic 6.
This document provides an introduction to the C++ programming language. It discusses what C++ is, its origins as an extension of the C language, and some key concepts in C++ programs. These include variables, data types, functions, input/output statements, and a simple example program. The document then demonstrates arithmetic, relational, and logical operations and examines pseudocode as a way to design algorithms before coding. Decision statements and flowcharts are introduced as tools for programming logic and conditional execution.
This document discusses methods in C#, including how they are declared, invoked, and used. It covers key concepts like the main method, passing parameters by value and reference, output parameters, variable argument lists, and method overloading. Methods are declared inside classes and give objects their behavioral characteristics by allowing processing of data and responses to messages from other objects. The main method is the starting point of all C# programs and must be static. Parameters can be passed by value or reference, and output parameters pass results back using the out keyword. Variable argument lists use params arrays, and overloading methods have the same name but different parameters.
This document provides an overview of basic object-oriented programming (OOP) concepts including objects, classes, inheritance, polymorphism, encapsulation, and data abstraction. It defines objects as entities with both data (characteristics) and behavior (operations). Classes are blueprints that are used to create objects. Inheritance allows objects to inherit properties from parent classes. Polymorphism allows code to take different forms. Encapsulation wraps data and functions into classes, hiding information. Data abstraction focuses on important descriptions without details.
This document assigns a group project on data types in C++ to seven students. It discusses the three main data types in C++ - character, integer, and float. Character data can store single characters, integer data stores whole numbers, and float data stores numeric values with decimals. It also covers variable declaration and initialization in C++, noting that variables must be declared before use and can be initialized with a value upon declaration. The document assigns different aspects of the data types topic to the seven students listed at the top for further explanation in the project.
Constructor and destructor are special types of methods in object-oriented programming. Constructors are used to initialize objects and are called when an object is created, while destructors are used to destroy objects and are called when an object is deleted or goes out of scope. There are different types of constructors like default, parameterized, and copy constructors. Constructors cannot be inherited or virtual. Destructors are used to clean up resources used by an object and are called automatically when an object is destroyed. The key differences between constructors and destructors are that constructors initialize objects and can have parameters, while destructors destroy objects and have no parameters.
The document discusses namespaces in .NET. Namespaces help organize classes and interfaces logically and avoid naming conflicts. Namespaces use dot notation and can be defined using the namespace keyword. Assemblies contain namespaces and provide execution context and versioning. Private assemblies are used within one application while public assemblies in the global assembly cache can be used across applications. The compiler compiles to CIL and produces metadata. The runtime loads assemblies and the JIT compiler converts CIL to native code for the CPU.
ADO.NET is a set of libraries included with the .NET Framework that help communicate with various data stores from .NET applications. The ADO.NET libraries include classes for connecting to a data source, submitting queries, and processing results. ADO.NET also allows for disconnected data access using objects like the DataSet which allows data to be cached and edited offline. The core ADO.NET objects include connections, commands, data readers, data adapters and data sets which provide functionality similar to but also improvements over ADO.
This document provides an introduction to Visual Basic (VB). It describes VB as an evolved version of BASIC that is visual and event-driven. The VB environment contains a blank form window to design interfaces, a project window to view files, and a toolbox of controls. It also explains how to create a standard executable program in VB and describes the main components of the VB environment.
The document provides an introduction to control structures and programming concepts in Visual Basic, including decision making statements, looping statements, arrays, functions, procedures, and control arrays. It discusses various conditional structures like if-then and select-case statements. It also covers different types of loops like for-next loops and do-while loops. The use of arrays, both fixed-size and dynamic, in VB programming is explained. Finally, it discusses various built-in functions and different types of procedures in Visual Basic.
The .NET Framework is a software platform that allows developers to write and run applications and web services in any compliant language. It provides a common language runtime and class libraries. Applications are compiled to an intermediate language (IL) that is then compiled to native machine code by the common language runtime (CLR). The CLR handles memory management, security, and other low-level tasks. The .NET Framework supports multiple programming languages and tools like Visual Studio. It allows building Windows forms applications, web applications with ASP.NET, and web services.
Pointer arithmetic allows limited operations on pointers like incrementing, decrementing, addition and subtraction. When a pointer is incremented or decremented, its value changes by the size of the data type. Pointers store addresses, so adding two addresses is illegal as there is no meaning to the result. Subtracting pointers yields the offset between the two addresses. Operations like addition, subtraction on a pointer changes its value based on the data type size. Certain operations like addition of two addresses are illegal for pointers.
This document discusses the five main types of tokens in C++ - keywords, variables, constants, strings, and operators. It provides definitions and examples of each token type. Keywords are reserved words that cannot be used as variable names, while variables store values that can change. Constants represent fixed values, strings group characters within double quotes, and operators perform actions on operands like arithmetic, comparison, and assignment.
Data types in C include primary (fundamental) types like integers and floating-point numbers, as well as derived and user-defined types. Primary types include integers of various sizes (char, short, int, long) that can be signed or unsigned, and floating-point types like float, double, and long double. Integer types have size and value ranges that depend on the machine, such as 8-bit char from -128 to 127. Floating-point types have prescribed sizes and precision levels. User can define their own types using typedef to create new type names, or enum to define enumeration types with named values.
This document provides an overview of C# program structure and key concepts like namespaces, classes, structs, interfaces, enumerations, delegates, and abstract classes. It defines each concept, provides examples, and explains when to use each one and how they relate to each other. Namespaces help organize code, classes and structs define custom types, interfaces define common functionality, enumerations define named constants, delegates define callbacks, and abstract classes define common traits.
Introduction, Array of structure, Passing structure to function, Passing array of structure to function, Structure within structure ( Nested Structure), Union, Pointer to structure
This document provides an overview of control structures in Visual Basic. It describes the three types of control structures: sequence, selection, and iteration. Sequence refers to the default sequential execution of statements. Selection structures like If/Then/Else and Select Case allow branching program execution based on conditions. Iteration structures like For/Next loops and Do/Loop statements allow repeating a block of code until a condition is met. The document provides details and syntax examples for If/Then/Else, Select Case, For/Next loops, and Do/Loop in Visual Basic.
This document provides an introduction to Visual Basic programming concepts including data types, variables, operators, and functions. It discusses the different data types in Visual Basic like numeric, string, date, and boolean. It describes how variables are declared and the different scopes they can have. The document also covers operators like arithmetic, relational, and logical operators. Finally, it discusses built-in functions in Visual Basic for working with dates, strings, numbers, and converting between data types.
The document discusses using variables and constants in VBA code. It covers declaring variables and constants, specifying data types, naming conventions, assigning values, and different scopes including disposable, local, and global. It emphasizes declaring all variables at the top of procedures or modules and assigning values after declarations. Structuring code in a logical order is also discussed.
Visual Basic is a rapid application development tool that uses an interactive development environment. It allows users to create graphical user interfaces visually by dragging and dropping objects instead of writing code. Visual Basic uses an event-driven programming model, where code executes in response to user and system events. It supports object-oriented programming concepts like classes and modules. Variables can be declared with different data types and arrays can be fixed-size or dynamic.
This presentation is about the following points,
1. Why VB in QTP,
2. Vbscript variables and constants,
3. Vbscript arrays,
4. Writing functions and subroutines,
5. Writing conditional statements,
6. Writing loop statements,
7. Vbscript classes,
8. Writing and executing simple VBscript in QTP,
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Computer programming - variables constants operators expressions and statementsJohn Paul Espino
The document discusses key concepts in C programming including variables, constants, operators, expressions, and statements. It defines variables as identifiers that store values, and constants as fixed values that cannot be changed. Common data types are described along with type modifiers. Local and global variables as well as formal parameters are explained. Arithmetic, relational, and logical operators are classified. Expressions are defined as combinations of operators, constants, and variables that evaluate to a value. Operator precedence is also covered. Examples are provided to illustrate various concepts.
The document discusses best practices for naming variables. It recommends initializing variables as they are declared, giving variables descriptive names to indicate their purpose, and adopting naming conventions to make code more consistent and readable for multiple programmers. Standardized prefixes and abbreviations can make long names more compact while retaining clarity. Overall, the goal is to use variable names that are meaningful, unambiguous, and help convey the essential logic of the code at a glance.
1. The document discusses various ways of creating custom data types in programming languages, including enumerated types, named constants, and arrays. It provides guidelines and examples of creating enumerated types, using named constants, and properly utilizing arrays.
2. Creating custom data types through techniques like enumerated types and typedefs can make code more readable, reliable, and modifiable. It allows one to centralize type definitions for easier maintenance.
3. Guidelines are provided for creating enumerated types, using named constants, properly utilizing arrays, and defining custom data types. Examples are given in languages like C, C++, Pascal, and Ada.
Notes how to work with variables, constants and do calculationsWilliam Olivier
1. The document discusses different ways of storing and working with data in a Visual C++ application, including variables, constants, arrays, and structures.
2. It explains the differences between local and global scope for variables and constants, and shows examples of declaring identifiers in each scope.
3. The document also demonstrates how to convert between data types like string and double when retrieving user input and performing calculations.
This document discusses programming concepts such as variables, constants, data types, and program structure. It defines key terms like:
- Variables which store changing data in memory and are assigned a data type. Constants store fixed values.
- Data types include integers, reals, Booleans, strings, characters which determine how data is stored and processed.
- Programs use statements, selection (if/else), and repetition (loops). Procedures and functions are subroutines that can optionally return values.
- Parameters pass values to subroutines to influence their behavior. Variables can be global or local in scope, influencing where they are accessible.
This document discusses various C programming concepts including macros vs functions, ANSI C standards, constants, structures, unions, enums, storage classes like automatic, external, static, and register variables, and references for further reading. It provides examples to illustrate key differences between macros and functions, declaring and initializing constants, defining and using nested structures, unions that allow storing different data types in the same memory location, and static variables that retain their value between function calls.
This document discusses various C programming concepts including macros vs functions, ANSI C standards, constants, structures, unions, enums, storage classes like automatic, external, static, and register variables, and references for further reading. It provides examples to illustrate key differences between macros and functions, declaring and initializing constants, defining and using nested structures, unions that allow storing different data types in the same variable, and static and extern storage class specifiers.
This document provides an introduction to fundamentals of programming with C#, including definitions of key concepts like algorithms, variables, data types, operators, and conditional statements. It explains that programming involves describing what you want the computer to do as a sequence of steps or algorithms. The stages of software development are outlined as gathering requirements, planning/design, implementation, testing, deployment, support, and documentation. An overview of C# programming language fundamentals is also provided, such as basic syntax structure, defining classes and methods, and using the console for input/output.
Coding best practices include:
1. Using macros, constants and configuration values instead of hard-coded values.
2. Initializing local variables before use and explicitly initializing variables whose initial values are important.
3. Using global variables judiciously and avoiding unnecessary global variables.
This document discusses variables, data types, and string functions in Visual Basic for Applications (VBA) with Excel. It defines different variable types like integer, string, date, and variants. Mathematical and string operators that can be used with variables are also presented. The document explains declaring and initializing variables, variable scope, and using constants to give names to values. Common string functions like Str, Val, Trim, Left, Right and Mid are also summarized.
This presentation covers the syllabus of Himachal Pradesh University for the subject of ASP.NET Technologies. This is part -2 of a syllabus. This is particularly for BCA students.
The document provides an introduction to the C programming language. It discusses the fundamentals of C including data types, variables, operators, control structures, arrays, functions, pointers, structures, unions, and file handling. The three key modules covered are: 1) C fundamentals, 2) arrays, functions, and strings, and 3) pointers, structures, unions, and file handling.
Introduction to Programming Fundamentals 3.pdfAbrehamKassa
The document discusses various programming constructs in C++ including IDEs, writing source code, saving and compiling source files, and dealing with errors. It also covers C++ statements, expressions, variables, data types, literals, symbolic constants, and identifiers. Key points include how to write, save, compile and run a C++ program, declare variables, and use constants. Symbolic constants are preferable to literal values as they allow easy program modification.
Unit 1 introduction to visual basic programmingAbha Damani
This document provides an introduction to visual basic programming, covering topics such as variables, data types, operators, flow control, procedures, arrays, strings, and exception handling. It discusses the visual studio integrated development environment and its key components. It defines variables and data types, and covers implicit and explicit type conversions. Control flow structures like conditional statements, selection statements, and iteration statements are explained. Procedures such as subroutines and functions are defined. Finally, it provides examples of arrays and strings.
Unit 4 - Basic ABAP statements, ABAP Structures and ABAP Logical Expressionsdubon07
This presentation contains the following topics:
1. Working with Elementary Data Objects.
2. Basic ABAP statements
3. Performing ABAP calculations
4. ABAP Calculator
5. ABAP Structures
6. How to create ABAP structures
7. Dialog Messages
8. ABAP IF statement and CASE
9. ABAP Logical Expressions
10. ABAP Loops
11. ABAP Search Helps F4
12. ABAP Elementary Search Help
13. ABAP Exercise: Flight Information Report Summary
Software engineering is concerned with developing software using a systematic process and addressing factors like increasing demands and low expectations. It involves activities like specification, development, validation and evolution. Some key challenges are coping with diversity, reduced delivery times and developing trustworthy software. Different techniques are suitable depending on the type of system, and processes may incorporate elements of models like waterfall, incremental development and integration/configuration. Prototyping can help with requirements, design and testing.
The document provides an introduction to software engineering and discusses software, software engineering, the software development life cycle (SDLC), and SDLC models. It defines software and its components. It describes software engineering goals and challenges. It explains the SDLC phases including feasibility study, requirements analysis, design, development, testing, deployment, and maintenance. It discusses various SDLC models like waterfall, iterative, prototype, spiral, and agile models.
Software Engineering-Unit 2 "Requirement Engineering" by Adi.pdfProf. Dr. K. Adisesha
The document discusses requirement engineering and provides details on:
- Types of requirements including functional, non-functional, user, and system requirements
- The requirement engineering process including feasibility studies, elicitation, analysis, specification, validation, and management
- Software requirement specification (SRS) documents, their purpose, characteristics of a good SRS, and typical sections
- Functional and non-functional requirements in more depth
This document discusses system modeling. It defines system modeling as developing abstract models of a system from different perspectives. Common modeling techniques discussed include context models, interaction models, structural models, behavioral models, and model-driven engineering. Specific modeling languages covered are activity diagrams, use case diagrams, sequence diagrams, class diagrams, and state diagrams. The document provides examples and definitions for how to apply these modeling approaches and languages.
Architectural design establishes the framework for software development by examining requirements and designing a model that specifies system components, their inputs/outputs/functions, and interactions. It can be represented using structural, dynamic, process, functional, or framework models. The outputs are an architectural design document and various project plans. Architectural design decisions impact non-functional requirements and common decisions include architectural style and system decomposition.
The document discusses various types of software testing including unit testing, component testing, system testing, test-driven development, release testing, and user testing. It provides details on the goals and processes involved in each type of testing. Unit testing involves testing individual program units in isolation to check functionality. Component and system testing focus on interactions between units and components. Test-driven development interleaves writing tests before code. Release testing validates that software meets requirements before release. User testing involves customers providing input on a system under test.
This document discusses computer communication and networks. It defines data communication and its key characteristics of delivery, accuracy, timeliness and jitter. It describes the core components of a data communication system including the message, sender, receiver, transmission medium and protocols. It then discusses different types of computer networks including LANs, WANs, PANs and MANs. The key aspects covered are their definitions, examples, advantages and disadvantages.
Data communication involves the exchange of data between two devices via transmission media such as cables. It consists of five main components: a message, sender, receiver, transmission medium, and protocol. Data can be transmitted in three modes - simplex, half-duplex, and full-duplex. Transmission media can be guided (wired) such as twisted pair or coaxial cables, or unguided (wireless) such as radio waves. Networks are sets of connected devices that can be arranged in various topologies like bus, star, ring, or mesh. Switching techniques such as circuit, message, and packet switching determine how data is routed through a network.
The document discusses the data link layer. It covers the following key points:
- The data link layer has two sublayers: the logical link control (LLC) sublayer and the medium access control (MAC) sublayer.
- The LLC sublayer controls flow and performs error checking, while the MAC sublayer handles frame encapsulation and network addressing.
- The data link layer is responsible for framing, addressing, error control, flow control, and multi-access functionality. It takes packets and converts them to frames for transmission on the physical layer.
- Error detection techniques used include parity checks and cyclic redundancy checks to validate frames are transmitted accurately. Error correction can be done through retransmission
The document provides an overview of the network layer. It discusses key topics like the functions of the network layer such as logical addressing, routing, and internetworking. It describes different routing algorithms including distance vector, link state, and hierarchical routing. It also covers congestion control mechanisms like leaky bucket algorithm, token bucket algorithm, and admission control that are used to control congestion in the network layer.
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3. INTRODUCTION
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Programming using Visual Basic:
Visual Basic uses building blocks such as Variables, Data Types, Procedures, Functions
and Control Structures in its programming environment.
This section concentrates on the programming fundamentals of Visual Basic with the
blocks specified.
➢ MODULES : Code in Visual Basic is stored in the form of modules, which are of three
type Form Modules, Standard Modules and Class Modules.
➢ Each module can contain:
❖ Declarations :May include constant, type, variable and DLL procedure declarations
❖ Procedures : A sub function, or property procedure that contain pieces of code that
can be executed as a unit.
4. DATA TYPES
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Data types in Visual Basic:
The compiler sets apart a number of bytes for each of the variable depending on the
data type of holds
Data types in Visual Basic
❖ Numeric
❖ String
❖ Date
❖ Boolean
❖ Variant
5. Data type Size Range
Byte 1 byte Byte Store integer values in the range of 0 - 255
Integer 2 bytes Integer Store integer values in the range of (-32,768) - (+ 32,767)
Long 4 bytes Long Store integer values in the range of (- 2,147,483,468) - (+ 2,147,483,468)
Single 4 bytes Single Store floating point value in the range of (-3.4x10-38) - (+ 3.4x1038)
Double 8 bytes Double Store large floating value which exceeding the single data type value
Currency 8 bytes Currency store monetary values. It supports 4 digits to the right of decimal point
and 15 digits to the left
Decimal 14 bytes Decimal stores value with 28 places to the right of the decimal; smallest non-zero
number is +/-0.0000000000000000000000000001
DATA TYPES
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➢ Numeric Data type: The fundamental data types in Visual Basic including variant
are integer, long, single, double, string, currency, byte and boolean.
6. DATA TYPES
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Data types :
➢ String: Use to store alphanumeric values. A variable length string can store
approximately 4 billion characters. Uses storage size10 bytes +
➢ Date : Use to store date and time values. A variable declared as date type can store
both date and time values and it can store date values 01/01/0100 up to 12/31/9999. It
uses storage size of 8 bytes
➢ Boolean : Boolean data types hold either a true or false value. These are not stored as
numeric values and cannot be used as such. Values are internally stored as -1 (True)
and 0 (False) and any non-zero value is considered as true. Uses storage size of2 bytes
➢ Variant : In Visual Basic if we declare a variable without any data type by default the
data type is assigned as variant data type.
7. VARIABLES
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Variables:
Variables are the memory locations which are used to store values temporarily. A
defined naming strategy has to be followed while naming a variable.
➢ A variable name must begin with an alphabet letter and should not exceed 255
characters.
➢ It must be unique within the same scope.
➢ The different ways of declaring variables in Visual Basic are listed below:
❖ Explicit Declaration
❖ Implicit Declaration
❖ Using Option Explicit statement
8. VARIABLES
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Variables:
Variables are the memory locations which are used to store values temporarily. A
defined naming strategy has to be followed while naming a variable.
➢ The following are the rules when naming the variables in Visual Basic:
❖ It must be less than 255 characters
❖ No spacing is allowed
❖ It must not begin with a number
❖ Period is not permitted
❖ Cannot use exclamation mark (!), or the characters @, &, $, #
❖ Cannot repeat names within the same level of scope.
9. VARIABLES
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Explicit variables declaration :
Declaring a variable tells Visual Basic to reserve space in memory. to have more
control over the variables, it is advisable to declare them explicitly.
➢ The variable can have different names and different types of values.
➢ The dim is keyword in visual Basic and has language specific meaning.
➢ Syntax for Declaring Variable
Dim VaribaleName As DataType
➢ Example :
Dim Regno as integer
Dim Myname as string
10. VARIABLES
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Implicit variables declaration :
Visual Basic encounters a new variable, it assigns the default variable type and value.
This is called implicit declaration. Though this type of declaration is easier for the user.
➢ It may be convenient to declare variables implicitly, but it can lead to errors that may
not be recognized at run time
➢ Syntax for Declaring Variable
Dim str1,str2
Str1= “Implicit Declaration”
Str2= Intcount + 1
11. VARIABLES
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Option Explicit variables declaration :
This forces the user to declare all the variables. The Option Explicit statement checks
in the module for usage of any undeclared variables and reports an error to the user.
➢ The user can thus rectify the error on seeing this error message.
➢ The Option Explicit statement can be explicitly placed in the general declaration
section of each module using the following steps.
❖ Click Options item in the Tools menu
❖ Click the Editor tab in the Options dialog box
❖ Check Require Variable Declaration option and
then click the OK button
13. VARIABLES
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Scope of the variable:
The scope of variable determines where you can access that variable in your code.
➢ If a variable is in scope you can read or set its value.
➢ If it is out of scope you will not be able to access it.
➢ Types of scope for variables in visual basic
❖ Global scope: Global variables are in scope anywhere in your application
❖ Module scope :Module level variables are in scope anywhere within the module
where they are declared
❖ Local scope : Local variables are only in scope within the procedure where they
are declared.
14. Variables
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Scope of the variable:
Types of scope for variables in visual basic
➢ Local Variables: A local variable is one that is declared inside a procedure. This
variable is only available to the code inside the procedure.
Dim sum As Integer
➢ Static Variables: Static variables are not reinitialized each time Visual basic invokes a
procedure and therefore retains or preserves value even when a procedure ends.
Static intPermanent As Integer
➢ Module Level Variables: A module level variable is available to all the procedures in
the module. They are declared using the Public or the Private keyword. these
variables are useful for sharing data among procedures in the same module.
Public CustomerName As String
15. VARIABLES
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Local Variables:
A local variable is one that is declared inside a procedure. This variable is only
available to the code inside the procedure and can be declared using the Dim
statements.
Dim sum As Integer
➢ The local variables exist as long as the procedure in which they are declared, is
executing.
➢ Once a procedure is executed, the values of its local variables are lost and the memory
used by these variables is freed and can be reclaimed.
➢ Variables that are declared with keyword Dim exist only as long as the procedure is
being executed.
16. VARIABLES
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Static Variable:
Static variables are not reinitialized each time Visual Invokes a procedure and
therefore retains or preserves value even when a procedure ends. These static variables
are also ideal for making controls alternately visible or invisible.
➢ A static variable is declared as given below.
Static intPermanent As Integer
➢ Variables have a lifetime in addition to scope.
➢ The value of a local variable can be preserved using the Static keyword.
Private Sub Command1_Click ( )
Static Counter As Integer
End Sub
17. VARIABLES
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Module Level Variable:
A module level variable is available to all the procedures in the module. They are
declared using the Public or the Private keyword.
If you declare a variable using a Private or a Dim statement in the declaration section
of a module—a standard BAS module, a form module, a class module, and so on.
➢ A Private module-level variables are visible only from within the module they belong to
and can't be accessed from the outside. these variables are useful for sharing data
among procedures in the same module:
Private LoginTime As Date ' A private module-level variable
➢ A Public module-level variable that can be accessed by all procedures in the module
to share data and that also can be accessed from outside the module.
18. VARIABLES
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Assigning Values to Variables:
After declaring various variables using Dim statements,we can assign values to
variables.
➢ Example:
❖ firstNumber=100
❖ secondNumber=firstNumber-99
❖ userName=“K Adisesha"
❖ userpass.Text = password
❖ Label1.Visible = True
❖ Command1.Visible = false
❖ Label4.Caption = textbox1.Text
❖ ThirdNumber = Val(usernum1.Text)
19. CONSTANTS
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Constants in Visual Basic:
Constant also store values, but as the name implies, those values remains
constant throughout the execution of an application.
➢ Using constants can make your code more readable by providing meaningful names
instead of numbers.
➢ There are a number of built –in constants in Visual Basic.
➢ There are two sources for constants:
❖ System-defined constants : are provided by applications and controls. Visual Basic
constants are listed in the Visual Basic (VB). Form1.WindowState=value
❖ User-defined constants: are declared using the Const statement. It is a space in
memory filled with fixed value that will not be changed.
Const constant_name = value
20. OPERATORS
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Operators in Visual Basic:
An operator is a special symbol which indicates a certain process is carried out.
Operators in programming languages are taken from mathematics.
➢ The operators are used to process data.
➢ Types of operators in Visual Basic:
❖ Arithmetical operators
❖ Relational operators
❖ Logical operators.
21. OPERATORS
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ARITHMETICAL OPERATORS:
Arithmetic operators are used to perform many of the familiar arithmetic operations that
involve the calculation of numeric values represented by literals, variables, other
expressions, function and property calls, and constants.
22. OPERATORS
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RELATIONAL OPERATORS:
Comparison operators are used for Decision Making or compare two expressions and
return a Boolean value that represents the relationship of their values.
➢ It uses If/Then structure
➢ Allows a program to make decision based on the truth or falsity of some expression
Condition:
➢ The expression in an If/Then structure
❖ If the condition is true, the statement in the body of the structure executes
➢ Conditions can be formed by using
❖ Equality operators
❖ Relational operators
23. OPERATORS
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RELATIONAL OPERATORS:
Comparison operators compare two expressions and return a Boolean value that
represents the relationship of their values. There are operators for comparing numeric
values, operators for comparing strings, and operators for comparing objects..
Operators Description Example Result
> Greater than 10>8 True
< Less than 10<8 False
>= Greater than or equal to 10>=8 True
<= Less than or equal to 10<=8 False
== Equal to 10==8 false
<> Not Equal to 10<>8 True
24. OPERATORS
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LOGICAL OPERATORS:
In addition to conditional operators, there are a few logical operators which offer added
power to the VB programs.
➢ Logical operators compare Boolean expressions and return a Boolean result.
➢ Some of these operators can also perform bitwise logical operations on integral
values.
Operators Description
OR OR Operation will be true if either of the operands is true
AND Operation will be true only if both the operands are true
XOR One side or other must be true but not both
NOT Negates true
25. BUILT IN FUNCTIONS
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BUILT IN FUNCTIONS:
Many built in functions are offered by Visual basic under various categories.
➢ These functions return a value.
➢ Types of built in functions in VB are:
❖ Date and Time function
❖ Format function
❖ String function
❖ Numeric function
26. BUILT IN FUNCTIONS
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BUILT IN FUNCTIONS:
Date and Time function: Use to store date and time values. A variable declared as date
type can store both date and time values and it can store date values 01/01/0100 up to
12/31/9999. Time between 0:00:00 and 23:59:59. It uses storage size of 8 bytes
Year Year(now)
Month Month(now)
Day Day(now)
Weekday Weekday(now)
Hour Hour(now)
Minute Minute(now)
Second Second(now)
27. BUILT IN FUNCTIONS
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BUILT IN FUNCTIONS:
Format function & String functions: Use to convert values in other formatted which are
convenient for user to use in application.
28. CONVERSION
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DATA TYPE CONVERSION:
Visual Basic functions either to convert a string into an integer or vice versa and many
more conversion functions.
Conversion To Function Description
Boolean Cbool The function Cbool converts any data type to Boolean 0 or 1
Byte Cbyte The function Cbyte converts any data type to Byte
Currency Ccur The function Ccur converts any data type to currency
Date Cdate The function Cdate converts any data type to date.
Decimals Cdec The function Cdec converts any data type to decimal
Value Cval The CVal function is used to convert string to double-
precision numbers.