Fast sign of integer in C

Question

There is a sign function in C:

int sign(int x)
{
    if(x > 0) return 1;
    if(x < 0) return -1;
    return 0;
}

Unfortunately, comp

Answer 1

int i = -10;
if((i & 1 << 31) == 0x80000000)sign = 0;else sign = 1;
//sign 1 = -ve, sign 0 = -ve