Functions c++ - hackerrank

 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;
}