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  1. #include <stdio.h>
  2. int logb2(int x)
  3. {
  4.     int y = 0;
  5.  
  6.     if (x == 0) {
  7. 	fprintf(stderr,"Logic error in logb2.\n");
  8. 	exit(1);
  9.     }
  10.  
  11.     while ((x & 1) == 0) {
  12. 	y++;
  13. 	x >>= 1;
  14.     }
  15.     return y;
  16. }
  17. int main()
  18. {
  19. 	int n[5]={2048,1024, 512, 256, 128};
  20. 	int i;
  21. 	for(i=0;i<5;i++)printf("%d ",logb2(n[0]/n[i]));
  22. 	printf("\n");
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 4304KB
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https://ideone.com/LBgqRP
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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