Legal operators ! ~ & ^ | << >>

I have tried this code:

int lhs = ((x << 31)>>31);
int rhs = (x >> 31);
return (~(lhs ^ rhs));

But output was not always as expected

CodePudding user response：

1. I don't know of any data type whose MSB is bit 30. However, 32- bit ints have their MSB in bit 31, so you might try using that value instead.

2. You should always use unsigned types when performing bit operations.

   #include <stdint.h>
   
   uint32_t lsb = ((uint32_t)(value & 1));
   uint32_t msb = ((uint32_t)((value >> 31) & 1));
   
   return !(msb ^ lsb);