Check if a number x is positive (x>0) by ONLY using bitwise operators in C

Question

isPositive - return true if x > 0, otherwise false

Example: isPositive(-1)

Legal ops:

Answer 1

int x,len;
x = 0x0fffffff;
len = (sizeof(x) * 8) - 2;

if ((x>>len))
 printf("Negative\n");
else
 printf("Positive\n");

X will be either int or char(Integral type).