C Program to Find Maximum Between Two Numbers using Function

This program finds the maximum of two numbers using a user-defined function in C. It demonstrates how to declare, define, and call a function with return values.

Concept Overview

A function in C allows code reusability and better program organization. In this program, the `max()` function takes two integer arguments and returns the greater of the two.

Program

#include <stdio.h>

// Function to find maximum of two numbers
int max(int a, int b) {
    return (a > b) ? a : b;
}

int main() {
    int num1 = 10, num2 = 20;
    int maximum;

    // Function call
    maximum = max(num1, num2);

    printf("Max value is : %d\n", maximum);

    return 0;
}

Output

Max value is : 20

Explanation

• The function `max()` takes two integer parameters and returns the greater value.
• In `main()`, two integers `a` and `b` are declared and passed to the `max()` function.
• The returned result is stored in `ret` and displayed using `printf()`.
• This program demonstrates function declaration, definition, and calling.