Introduction to C Structure of a C Program Variables and Data Types Input and Output Operators in C Decision Making If Statement if...else Statement Nested if Statement Nested if...else Statement Switch Statement Loops For Loop While Loop Do While Loop Loop Comparison Arrays Strings Functions Function Types Library Functions User-Defined Functions Recursion Function Pointers Structures File Handling Common Mistakes Ideas

// Documentation: My first structured program
#include <stdio.h>  // Header inclusion

#define PI 3.14       // Definitions

int add(int a, int b); // Function Declaration

int main() {
    int result = add(5, 3);
    printf("Sum = %d\n", result);
    return 0;
}

int add(int a, int b) { // User-defined function
    return a + b;
}