c programming notes

I’ll prepare full, detailed C programming notes so they can serve as complete study
material. This will cover basics, syntax, data types, operators, control structures,
functions, arrays, pointers, structures, file handling, and important functions.




📚 C Programming — Complete Detailed
Notes
1. Introduction to C
C is a general-purpose, procedural programming language developed by Dennis
Ritchie in 1972 at Bell Labs.

Features:

• Fast execution
• Structured language
• Portable (can run on different systems)
• Low-level memory access via pointers



2. Structure of a C Program
#include <stdio.h> // Preprocessor directive

int main() { // Main function
printf("Hello, World!");
return 0; // Program ends
}


Parts:

• Preprocessor Directives: #include to include header files
• Main Function: Starting point
• Statements: Instructions for the compiler
• Return Statement: Ends the program

, 3. Data Types in C

Basic Data Types

Type Size (bytes) Example

int 2 or 4 int age = 25;

float 4 float price = 10.5;

double 8 double pi = 3.14159;

char 1 char grade = 'A';




4. Variables & Constants
Variables: Named storage for data.

int age = 20;


Constants:

const float PI = 3.14;




5. Operators in C

Arithmetic Operators

+, -, *, /, %

Relational Operators

==, !=, <, >, <=, >=