C Language Introduction

Instructor Introduction

• Name: Steve Ramallah
• Experience: 10 years in C and C++ development and training

Overview of C Language

• Developed by: Dennis Ritchie in 1972
• Location: AT&T Bell Laboratories, USA
• Purpose: Used to write computer programs

Examples of Computer Programs

• Railway Reservation System:
  • Computer program facilitates ticket booking
• Hospital Patient Registration:
  • Computer used for patient registration
• Electronic Appliances:
  • Washing machines, microwaves, etc., operate using computer programs.

C Programming Environment

Components Needed for Development

1. Text Editor:

   • Example: Notepad
   • Purpose: To write the source code.

2. Compiler:

   • Converts text program into executable code.
   • Examples:
     • Microsoft Visual Studio
     • GNU Compiler

Program Development Process

• Write code in a text editor
• Use compiler to convert to executable
• Commercial compilers provide additional tools for testing and debugging.

Example of a Simple C Program

Explanation of the Program

• #include <stdio.h>:
  • Preprocessor directive that includes the Standard Input Output library.
  • Provides the functionality for printf.
• int main():
  • Entry point of the program.
  • Contains the execution statements.
• printf("Welcome to C\n");
  • Function to display the message on the screen.
  • \n is a newline character.
• return 0;
  • Indicates that the program has executed successfully.

Important Concepts

• Semicolon:
  • Indicates the end of a statement in C.
• Function:
  • A set of statements that perform a specific task (e.g., main, printf).
• Header Files:
  • Contain details about functions used in programs (e.g., stdio.h).
• Precompiler Directive:
  • Executes before the compilation process starts, allowing for inclusion of header files.