Write a C program for finding the largest number among the four given numbers.

Here's a simple C program to find the largest number among four given numbers:

#include <stdio.h>

int main() {
    int num1, num2, num3, num4, largest;

    // Input four numbers
    printf("Enter four numbers: ");
    scanf("%d %d %d %d", &num1, &num2, &num3, &num4);

    // Assume the first number is the largest
    largest = num1;

    // Compare with the second number
    if (num2 > largest) {
        largest = num2;
    }

    // Compare with the third number
    if (num3 > largest) {
        largest = num3;
    }

    // Compare with the fourth number
    if (num4 > largest) {
        largest = num4;
    }

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

    return 0;
}

This program reads four integers from the user, compares them to determine the largest, and prints the result.