Infinite loop when simplifying fractions in binary in C

I'm trying to simplify fractions in binary with this code that checks if the value is even:

int is_even(floatlet value){
  if(value & 1) return 0;
  return 1;
}

And this while loop keeps bit shifting until the value is odd.

while(is_even(numerator) && is_even(denomExp)){
  numerator >>= 1;
  denomExp <<= 1;
}

The while loop goes on an infinite loop. I'm wondering why? We've done test and the is_even function works fine. Thanks!