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  1. #include <stdio.h>
  2. int f1(unsigned char i){
  3. 	//if文を使う
  4. 	if(i>99)i/=2;
  5. 	return i;
  6. }
  7. int f2(unsigned char i){
  8. 	//マスクを使う
  9. 	unsigned char mask=(~(i-100)>>8)&0xFF;
  10. 	i=i^(mask&(i^(i/2)));
  11. 	return i;
  12. }
  13. int main(void) {
  14. 	for(int i=0;i<256;i++){
  15. 		int f1r=f1((unsigned char)i);
  16. 		int f2r=f2((unsigned char)i);
  17. 		if(f1r!=f2r)
  18. 			printf("miss! i=%d f1=%d f2=%d\n",i,f1r,f2r);
  19. 		//printf("i=%d f1=%d f2=%d\n",i,f1r,f2r);
  20. 	}
  21. 	puts("end");
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 4572KB
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Standard input is empty
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end
https://ideone.com/qrj6GX
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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