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  1. #include <stdio.h>
  2.  
  3. int bit_count(int x)
  4. {
  5. 	int ret = 0;
  6.  
  7. 	while ( x )
  8. 	{
  9. 		++ret;
  10. 		x = x & ( x + ( ~1 + 1 ) );
  11. 		// ~1 + 1 == -1
  12. 		// x + (-1) == x - 1
  13. 	}
  14.  
  15. 	return ret;
  16. }
  17.  
  18. int main(void)
  19. {
  20. 	int input;
  21.  
  22. 	if ( scanf("%d", &input) == 1 )
  23. 		printf("Count of 1 bits: %d\n", bit_count(input));
  24.  
  25. 	return 0;
  26. }
  27.  
Success #stdin #stdout 0s 4496KB
comments (?)
stdin 
100
stdout 
Count of 1 bits: 3
https://ideone.com/Bqe1ZZ
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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