C Program Structure

📘 C 👁 63 views 📅 Dec 22, 2025

⏱ Estimated reading time: 1 min

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

Preprocessor directives are processed
Compilation begins
Execution starts from main()
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

🔒 Some advanced sections are available for Registered Members
Register Now

← Previous

Setting Up C Environment

Share this Post

🚀 Want to Test Your Knowledge?

Take quizzes related to this topic and see where you stand!

Start Quiz Now

← Back to Tutorials

Popular Competitive Exam Quizzes

GK/GS Quiz | UPSC Exam Quiz | English Grammar Basics Quiz | Science Quiz

C Tutorials