C

Introduction to C

C 215 views Dec 22, 2025 1 min read

Introduction to C

What is C?

C is a general-purpose, procedural programming language developed by Dennis Ritchie in 1972 at Bell Laboratories. It is widely used for system-level programming.

Characteristics of C

  • Structured programming language

  • Fast and efficient

  • Portable

  • Supports low-level memory access

  • Rich set of operators

  • Modular through functions

Advantages of C

  • Easy to learn

  • High performance

  • Close to hardware

  • Basis for many modern languages

  • Widely supported compilers

Basic Structure of a C Program

#include 

int main() {
    printf("Hello, World!");
    return 0;
}

Explanation of Program

  • #include : Includes standard input/output functions

  • main() : Entry point of the program

  • printf() : Displays output

  • return 0; : Ends program execution

Tokens in C

  • Keywords: int, return, if, while

  • Identifiers: Variable and function names

  • Constants: Fixed values such as 10, 5.5

  • Operators: +, -, *, /

  • Special Symbols: { } ( ) ;

Data Types in C

  • int – Integer values

  • float – Decimal values

  • double – Double precision values

  • char – Single character

Applications of C

  • Operating systems

  • Embedded systems

  • Compilers

  • Database systems

  • Game development

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