Maximum of Four Numbers in C

Summary: This C program reads four integers and determines the largest among them using a custom function. It demonstrates comparison logic and modular programming.

#include <stdio.h>
#include <limits.h>
/*
Add `int max_of_four(int a, int b, int c, int d)` here.
*/

// Function to return the maximum of four integers
int max_of_four(int a, int b, int c, int d) {
    int max = INT_MIN;
    if(a > max) {
        max = a;
    }
    if(b > max) {
        max = b;
    }
    if(c > max) {
        max = c;
    }
    if(d > max) {
        max = d;
    }
    return max;
}

int main() {
    int a, b, c, d;
    scanf("%d %d %d %d", &a, &b, &c, &d);
    int ans = max_of_four(a, b, c, d);
    printf("%d", ans);
    
    return 0;
}

Explanation:

Function Definition:
The max_of_four() function takes four integers and returns the highest value using sequential if statements. It initializes max to INT_MIN to ensure any number entered will be larger.

Header Files:
#include <limits.h> provides INT_MIN, a constant representing the lowest possible int value.

User Input:
The program reads four integers using scanf() and passes them to the function for evaluation.

Return Value:
The largest value is returned from the function and printed using printf().

Modular Design:
Separating logic into a function makes the program more reusable and easier to maintain or extend.