How do I find whether a number is positive, negative or zero without using if or for? [duplicate]

Question

I want to implement the sign and zero flag setting in microprocessor. So I need to write a function to find whether the number is positive, negative or zero without using if or for loops and also only Boolean and bitwise operators are allowed. I did the following. But how to I implement it for zero condition ?

int status (int x) {
    int sign = (x >> 31);
    return sign;
}

Any suggestions ?

Answer 1

The following will return -1 for negative values, 0 for zero, 1 for positive values of x.

int status (int x) {
  int sign = (x > 0) - (x < 0); 
  return sign;
}

Answer 2

Is this enough for your purpose?

int status(int val)
{
    int minus = (val&0x80000000)&&TRUE;
    int pos = (val&0x7FFFFFFF)&&(!(val&0x80000000));
    int r = 0 - minus + pos;
    return r;
}