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  1. #include <stdio.h>
  2.  
  3. int logb2(int x)
  4. {
  5.     int y = 0;
  6.  
  7.     if (x == 0) {
  8. 	fprintf(stderr,"Logic error in logb2.\n");
  9. 	exit(1);
  10.     }
  11.  
  12.     while ((x & 1) == 0) {
  13. 	y++;
  14. 	x >>= 1;
  15.     }
  16.     return y;
  17. }
  18. int main()
  19. {
  20. 	int n[5]={2048,1024, 512, 256, 128};
  21. 	int i;
  22. 	for(i=0;i<5;i++)printf("%d ",logb2(n[0])-logb2(n[i]));
  23. 	printf("\n");
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 4476KB
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https://ideone.com/FZxdQQ
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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