COMPUTER PROGRAMMING
INTRODUCTION TO COMPUTER PROGRAMMING
1) Introduction to Computer Programming.
2) Computer, Hierarchy of Computer, Compiler.
3) Interpreter, High level language, Features of C language.
Program
Software
Compiler
Interpreter
Modular programming/Structured Programming
Non structured programming
Need of Programming language
Difference between structured and object oriented programming
Advantages of object oriented programming
COMPUTER PROGRAMMING
INTRODUCTION TO COMPUTER PROGRAMMING
1) Introduction to Computer Programming.
2) Computer, Hierarchy of Computer, Compiler.
3) Interpreter, High level language, Features of C language.
Program
Software
Compiler
Interpreter
Modular programming/Structured Programming
Non structured programming
Need of Programming language
Difference between structured and object oriented programming
Advantages of object oriented programming
Software is a set of programs, which is designed to perform a well-defined function. A program is a sequence of instructions written to solve a particular problem.
01.Low Level Languages
02.High Level Languages
03. Machine Language
04. Assembly language
05.Third Generation Languages
06. Fourth Generation Languages
07. 5TH GENERATION
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3. OBJECTIVES:
TO UNDERSTAND WHAT IS COMPUTER
LANGUAGE.
TO UNDERSTAND LOW LEVEL AND HIGH LEVEL
LANGUAGE .
TO DIFFRENTIATE BETWEEN LOW LEVEL AND
HIGH LEVEL LANGUAGE.
4. COMPUTER LANGUAGES
• A computer language is a artificial language
designed to work for different applications
in different environments.
• Programming languages can be used to create
Programs that control the behavior of a
computer and serve any purpose.
5. COMPUTER LANGUAGES
• The term programming languages usually
refers to high level languages
such as BASIC, C, C++, COBOL,FORTMAN,
PASCAL,
JAVA, ORACLE, ASP, NET, and C#.
• Each language has a unique set of keywords
(words that it understands)
6. COMPUTER LANGUAGES
oHuman languages are known as natural languages. Unfortunately,
computer cannot understand natural languages, as a result we must
communicate with computers using computer languages.
oThese languages are:
• High level languages
• Low level languages
• Assembly languages
• Machine languages
8. High-level programming language
• High-level programming language is a programming
language with strong abstraction from the details of
the computer. In contrast to low-level programming
languages, it may use natural language elements, be
easier to use, or may automate (or even hide entirely)
significant areas of computing systems (e.g. memory
management), making the process of developing a
program simpler and more understandable than when
using a lower-level language. The amount of abstraction
provided defines how "high-level" a programming
language is.
• In the 1960, high-level programming languages using
a compiler were commonly called autocodes. Examples
of autocodes are COBOL and Fortran
9. COBOL
• COBOL is a compiled English-like computer
programming language designed for business
use. It is imperative, procedural and, since
2002, object-oriented. COBOL is primarily
used in business, finance, and administrative
systems for companies and governments.
• Designed by: Howard Bromberg, Norman
Discount,Vernon Reeves, Jean E. Sammet,
William Selden, GertrudeTierney
• Developers: CODASYL,ANSI, ISO
• Stable release: ISO/IEC 1989:2014 / 2014
• Typing discipline: Weak, static
10. FORTRAN
• Fortran is a general-purpose, compiled
imperative programming language that
is especially suited to numeric
computation and scientific computing.
• Developer: John Backus and IBM
• Typing discipline: strong, static,
manifest
• Stable release: Fortran
2018 November 28, 2018; 19 months
ago
• Designed by: John Backus
• Designer: John Backus
11. High level language
It is a set of words and symbol which a programmer uses to write a
program.
• High-level language are much closer to human language. A programming
language such as C, FORTRAN or Pascal and COBOL that enables to write
programs which is understandable to programmer (Human) and can perform any
sort of task, such languages are considered high-level because they are closer to
human language.
• High level languages must use interpreter, compiler or translator to convert human
understandable program to computer readable code (machine code).
12. Some Examples
There are many high level languages.
• COBOL Business applications
• FORTRAN Engineering & Scientific
Applications
• PASCAL General use and as a teaching
tool
• C & C++ General Purpose – currently
most popular.
• PROLOG Artificial Intelligence
• JAVA General all purpose
programming
• NET General or web applications
13. Advantages of High level language over Low
level language
• They are near to English language, that they are easier to read, write and
maintain.
• High-level language make complex programming simpler.
• High level languages is portable, i.e., they can work on different operating
system.
• Length of the program is also small compared with low level.
• Many real time problems can be easily solved with high level language.
14. Disadvantages of High level languages
• They need to be translated for the computer to understand, hence work slower
than machine code.
• High level programs are comparatively slower than low level programs.
• Compared to low level programs, they are generally less memory efficient.
• Cannot communicate directly with the hardware.
15. Low Level Language
A low-level programming
language is a programming
language that provides little or
no abstraction from a
computer's instruction set
architecture—commands or
functions in the language map
closely to processor
instructions. Generally, this
refers to either machine code
or assembly language.
16. Low Level Language
• A computer low level language that deals with hardware registers by name is
known as assembly language.
• Assembly language is the best example of low level language, it is in between
machine language and high-level language.
• A low level language does not need a compiler or interpreter to run the
program, the process run low-level language code directly.
17. Are low level languages still in use?
• Programmers still use low level language when
speed is essential or when they need to perform
an operation that isn’t possible in a high-level
language.
18. Some examples where low level
languages still used
• Writing games or simulator program
• Writing operating system
• Programming robots
• Computers viruses, certain device drivers or other items very close to the
hardware or low-level operating system.
19. Assembly language
• Assembly language have the same structure and set of commands as machine
languages, but they enable a programmer to use names instead of numbers.
• In the early days of programming all programs were written in assembly
language but now almost programs are written in a high-level language.
• Each assembly language is a specific to a particular computer architecture, in
a contrast to most high level programming language which are generally
portable across multiple system.
20. Assembly language
• It uses mnemonic codes(short forms) for instruction and
allows the
• programmer to introduce names for blocks of memory
that hold data.
• Assembly language is designed to be easily translated
into machine language.
• Examples:-
• MOV AL,1h;load all with immediate value1 SUB
• R0,R0,#1;Decrement R0
• MUL R0,R1,R2
• STR R0,[R1,#20]
21. Machine language
• Machine code or machine language is a system of
instruction and data
• executed directly by a computer’s CPU.
• The lowest-level programming language that only be
understood
• by computers.
• Computer language that is directly executable by
computer without
• the need for translation by a computer or an assembler.
22.
23. Machine language
• The native language of the computer,
• The set of symbolic instructions in binary that is used to
• represent operations and data in a machine called “Machine Code"
• Machine language
• “0110101100101000
• Machine language is a collection of binary digits or bits that the
• computer reads and interprets.
• Machine language is the only language a computer understands.
• It is almost impossible for humans to use because they consist entirely
• of numbers.
24. Program Code Convert
oThere are four models of execution of program by process in high-
level languages:
• INTERPRETER
• COMPILER
• ASSEMBLER
• TRANSLATOR
25. Interpreter
• An interpreter is a program that executes
programming code directly.
• Interpreter can convert a source code, usually on a
step-by-step, line-by-line and unit-by-unit basis into
machine code.
• Interpreted languages are read and then executed
directly, with no compilation stage.
26. COMPILER
• Compiler is a program that compile source
code into executable instructions that a
computer can understand, it compiles code
and produce in EXE format before it run.
27. ASSEMBLER
• Assembler normally converts assembly language’s source
code into machine language.
• Assembly language is a family of low-level languages for programming
computers. It implements a symbolic representation of code.
• An assembler is a program that takes basic computer instructions and coverts
them into a pattern of bits (0 & 1) that the computer runs to produce result.
28. TRANSLATOR
• Translator is a computer program that translates one programming language
instructions into another programming language instructions.
• A computer source code is to be translated into a low-level programming
language where native code compilers change it in machine language for
execution.
• The source code is the code written either in assembly or high level language.