Biggest and smallest of four integers (No arrays, no functions, fewest 'if' statements)

Question

You see, I\'ve self-taught myself C++ (not completely, I\'m still procrastinating -_-). So, now I started university and they\'re teaching C and they made us do a program of

Answer 1

#include 

int max_of_four(int a, int b, int c, int d){
    int mx_A_B = (a > b) * a + (a <= b) * b;
    int mx_C_D = (c > d) * c + (c <= d) * d;

    return (mx_A_B > mx_C_D) * mx_A_B + (mx_A_B <= mx_C_D) * mx_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;
}