How to determine if a number is positive, negative, or zero without using if or for?

Question

I want to implement the sign and flag of zero in a microprocessor. Therefore, I need to write a function to determine if a number is positive, negative, or zero without using if or for loops, and only logical and bitwise operators are allowed . I did the following. But how to implement it for the condition zero ?

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

Any suggestions?

Answer 1

Return -1 for negative values ​​of 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; } 

Answer 3

try it

 int status (unsigned no) { int sign = 0; // If Zero // If -Ve = -1 OR If +Ve = -2 (sign = ( no | 0 )) && ( sign = (~( ( (no << 1) >> 1 ) == no)) ); // If +Ve (sign == -2) && (sign = 1); return sign; }