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

int max_of_four(int a, int b, int c, int d){
        int res=a;
        if(b/res)
            res=b;
        if(c/res)
            res=c;
        if(d/res)
            res=d;
        return res;
    }
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;
}