This document provides an overview of basic computer science concepts including operating systems, computer languages, compilers, interpreters, integrated development environments, object-oriented programming, and C#. It discusses how operating systems manage hardware and software resources, the evolution of computer languages from machine to high-level, and defines compilers and interpreters. It also introduces visual studio as an integrated development environment and describes key concepts of object-oriented programming and features of the C# programming language.

1. 1
Basic Introduction on
Computer Science

2. 2
FIGURE 1-1 A Computer System

3. 3
FIGURE 1-2 Basic Hardware Components

4. 4
Operating System
An operating system (OS) is system software that manages
computer hardware, software resources, and provides common
services for computer programs.
Windows
Linux
Android
iOS
Mac…and the list goes on
Few Example OS:

5. 5
FIGURE 1-3 Relationship between system and application software

6. 6
Computer Languages
To write a program for a computer, we must use a computer
language. Over the years computer languages have evolved
from machine language to natural languages.
Machine Languages
Symbolic Languages
High-Level Languages
Topics discussed in this section:

7. 7
FIGURE 1-9 Computer Language Evolution

8. # 8
PROGRAM 1-1 The Multiplication Program in Machine Language

9. 9
The only language understood by computer
hardware is machine language.
Note

10. 10
PROGRAM 1-2 The Multiplication Program in Symbolic Language

11. 11
PROGRAM 1-3 The Multiplication Program in C#

12. 12
Compiler
A compiler is primarily used for programs that
translate source code from a high-level programming
language to a lower level language (e.g. assembly
language, object code, or machine code) to create
an executable program

13. 13
Interpreter
An interpreter is a computer program that directly executes
instructions written in a programming or scripting language,
without requiring them previously to have been compiled into
a machine language program

14. 14
.Net Framework

15. 15
IDE
An integrated development environment (IDE) is a software
application that provides comprehensive facilities
to computer programmers for software development. An IDE
normally consists of at least a source code editor, build
automation tools and a debugger.
• Editing Source Code
• Syntax Highlighting
• Building Executables
• Debugging
• Local build automation

16. 16
Microsoft Visual Studio
Microsoft Visual Studio is an integrated development
environment (IDE) from Microsoft.
It is used to develop
• computer programs
• websites
• web apps
• web services
• mobile apps.

17. 17
OOPS
Object-oriented programming aims to implement real-world
entities like
• Abstraction
• Encapsulation
• Inheritance
• Polymorphism.
The main aim of OOP is to bind together the data and the
functions that operate on them so that no other part of the
code can access this data except that function.

18. 18
C# Introduction
Features Of C#
C-sharp is an object-oriented programming language that offers tons
of features to programmers.
Some of which are:
•Simple and easy to understand syntax.
•It offers Interoperability, scalability and is updatable.
•It is based on components.
•It has a rich library and is a structured language.
•It is type-safe i.e. it only allows code to access the memory
location for which it has authorized access.

19. 19
STRUCTURE OF C# PROGRAM

20. 20
Data types in C#
Features Of C#
A data type specifies the size and type of variable values. It is important to use the correct
data type for the corresponding variable; to avoid errors, to save time and memory, but it
will also make your code more maintainable and readable. The most common data types
are: