Example: Find Largest Among Three (Nested if) in C

// Find Largest Among Three (Nested if)
#include <stdio.h>

int main() {
    int num1, num2, num3, largest;

    // Step 1: Prompt user for input
    printf("Enter three numbers: ");

    // Step 2: Read the three numbers from user
    scanf("%d %d %d", &num1, &num2, &num3);

    // Step 3: Use nested if statements
    if (num1 >= num2) {
        // If num1 is greater than or equal to num2
        if (num1 >= num3) {
            // If num1 is also greater than or equal to num3
            largest = num1;
        } else {
            // Else, num3 must be greater than num1 (and num1 >= num2 is true)
            largest = num3;
        }
    } else {
        // If num2 is greater than num1
        if (num2 >= num3) {
            // If num2 is also greater than or equal to num3
            largest = num2;
        } else {
            // Else, num3 must be greater than num2 (and num2 > num1 is true)
            largest = num3;
        }
    }

    // Step 4: Print the largest number
    printf("%d is the largest number.\n", largest);

    return 0;
}