Example: Greatest of Three Numbers in C using Function

C
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// Greatest of Three Numbers in C using Function
#include <stdio.h>

// Function to find the greatest number
int biggest_number(int num1, int num2, int num3)
{
    if (num1 >= num2 && num1 >= num3)
        return num1;
    else if (num2 >= num1 && num2 >= num3)
        return num2;
    else
        return num3;
}

// It's the main function of the program
int main()
{
    int num1, num2, num3;

    // Step-1 Enter three integer values
    printf("INPUT-1: ");
    scanf("%d", &num1);

    printf("INPUT-2: ");
    scanf("%d", &num2);

    printf("INPUT-3: ");
    scanf("%d", &num3);

    // Step-2 Call the biggest_number() function and find the greatest number
    printf("\nGreatest Number :: %d", biggest_number(num1, num2, num3));
    return 0;
}