https://www.hackerrank.com/challenges/c-tutorial-functions/problem #include <iostream> #include <cstdio> using namespace std; int max_of_four(int a, int b, int c, int d) { if (a >= b && a>=c && a>=d) return a; else if(b>=a && b>=c && b>=d ) return b; else if(c>=a&& c>=b && c>= d) return c; else return d; }; int main() { int a,b,c,d; scanf("%d %d %d %d", &a, &b, &c, &d); int vv = max_of_four(a,b,c,d); printf ("%d", vv); return 0; }