Input Format
Input will contain four integers -  , one in each line.
Output Format
Print the greatest of the four integers.
Note: I/O will be automatically handled.

hackerrank functions in c programming problem solution

Functions in C Problem solution | HackerRank

#include <stdio.h>
/*
Add `int max_of_four(int a, int b, int c, int d)` here.
*/
int max(int a, int b) {
    return a > b ? a : b;    
}

int max_of_four(int a, int b, int c, int d) {
    return max(a, max(b, max(c, d)));
}

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;
}