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  1. #include <stdio.h>
  2.  
  3. unsigned int bits0(unsigned int num) {
  4. 	int count = 0; while(num) num >>=1, ++count; return count;	
  5. }
  6. #define LE 1
  7. unsigned int bits1(unsigned int num) {
  8.    union {unsigned int asInt[2];double asDouble;} t;
  9.    t.asDouble = (double)num;
  10.    return  (t.asInt[LE] >> 20)-0x400+2;
  11. }
  12. int main(int argc, char **argv) {
  13. 	int j=1<<12,i=0;
  14. 	for (;i<10;++i,j<<=1){
  15. 	  unsigned int d = j|1;
  16. 	  printf("%lu==%lu\n", bits0(d), bits1(d));
  17. 	}
  18. 	for (i=1;i<65536;++i)
  19. 		if(bits0(i)!=bits1(i))
  20. 	  		printf("ERROR i=%d %lu!=%lu\n", bits0(i), bits1(i));
  21.  
  22.   return 0;
  23. }
Success #stdin #stdout 0s 2248KB
comments (?)
stdin 
Standard input is empty
stdout 
13==13
14==14
15==15
16==16
17==17
18==18
19==19
20==20
21==21
22==22
https://ideone.com/Swd4TW
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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