C

C Program Structure

C 150 views Dec 22, 2025 1 min read

A C program follows a specific structure to ensure proper compilation and execution.

Basic Structure of a C Program

#include 

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

Components of a C Program

1. Documentation Section

  • Contains comments that describe the program

/* Program to display a message */

2. Link Section

  • Includes header files required by the program

#include

3. Definition Section

  • Defines symbolic constants

#define PI 3.14

4. Global Declaration Section

  • Declares global variables and function prototypes

int count;

5. main() Function

  • Entry point of the program

  • Program execution starts here

int main() {
    return 0;
}

6. Local Declaration Section

  • Variables declared inside functions

int a, b;

7. Executable Statements

  • Statements that perform operations

printf("C Programming");

8. User-Defined Functions

  • Functions written by the programmer

void display() {
    printf("Welcome");
}

Flow of Execution

  1. Preprocessor directives are processed

  2. Compilation begins

  3. Execution starts from main()

  4. Statements are executed sequentially

Summary

  • C program has a well-defined structure

  • main() is mandatory

  • Header files and definitions appear before main()

  • Functions improve modularity

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