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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. uint8_t func(uint32_t num, uint8_t shl) {
  5.     return shl * (1 - ((num-(1<<shl)) >> 31));
  6. } 
  7.  
  8. uint8_t func0(uint32_t num, uint8_t shl)
  9. {
  10.     if (num >= (1 << shl))
  11.     {
  12.         return shl;
  13.     }
  14.     else
  15.     {
  16.         return 0;
  17.     }
  18. }
  19.  
  20. int main(void) {
  21. 	int cnt = 0;
  22. 	for (uint16_t num = 0 ; num != 256 ; num++) {
  23. 	    for (uint8_t s = 0 ; s != 8 ; s++) {
  24. 		    int a = func0(num, s);
  25. 		    int b = func(num, s);
  26. 		    if (a != b) {
  27. 		    	printf("num=%d shl=%d comparison:%d func:%d\n", num, s, a, b);
  28. 		    	cnt++;
  29. 		    }
  30. 	    }
  31. 	}
  32. 	printf("Number of differences: %d\n", cnt);
  33. 	return 0;
  34. }
  35.  
Success #stdin #stdout 0s 10320KB
comments (?)
stdin 
Standard input is empty
stdout 
Number of differences: 0
https://ideone.com/Pv576a
language:
C99 (gcc 8.3)
created:
6 years ago
visibility:
public

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