C에서 부동 소수점 숫자의 자릿수를 계산하는 방법은 무엇입니까?

#include <stdio.h>
int char_set_bit_count(char number) {
   unsigned int count = 0;
   while (number != 0) {
      number &= (number-1);
      count++;
   }
   return count;
}
int count_float_set_bit(float x) {
   unsigned int n = sizeof(float)/sizeof(char); //count number of characters in the binary equivalent
   int i;
   char *ptr = (char *)&x; //cast the address of variable into char
   int count = 0; // To store the result
   for (i = 0; i < n; i++) {
      count += char_set_bit_count(*ptr); //count bits for each bytes ptr++;
   }
   return count;
}
main() {
   float x = 0.15625;
   printf ("Binary representation of %f has %u set bits ", x, count_float_set_bit(x));
}

Binary representation of 0.156250 has 6 set bits