Functions in C Hackerrank Solution - C Language For Explanation Watch Video : Code: #include < stdio.h > /* Add `int max_of_four(int a, int b, int c, int d)` here. */ 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; //6 } } int main() { ...