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  1. #include <stdio.h>
  2.  
  3. unsigned compress_Harold(unsigned x, unsigned m)
  4. {
  5.    unsigned r, s, b;    // Result, shift, mask bit. 
  6.  
  7.    r = 0; 
  8.    s = 0; 
  9.    do {
  10.       b = m & 1; 
  11.       r = r | ((x & b) << s); 
  12.       s = s + b; 
  13.       x = x >> 1; 
  14.       m = m >> 1; 
  15.    } while (m != 0); 
  16.    return r; 
  17. } 
  18.  
  19. unsigned compress(unsigned x)
  20. {
  21. 	int mask = 0xA9;
  22. 	int mask1 = mask & 0xF0;
  23. 	int mask2 = mask & 0x0F;
  24. 	return (((x & mask1)*0x03000000 >> 28) & 0x0C) | ((x & mask2)*0x50000000 >> 30);
  25. }
  26.  
  27. int main()
  28. {
  29. 	unsigned i;
  30. 	for (i = 0; i < 256; ++i)
  31. 		if (compress_Harold(i, 0xA9) != compress(i))
  32. 			printf("Error at x = %d\n", i);
  33. 	printf("Finished\n");
  34.  
  35. 	return 0;
  36. }
  37.  
Success #stdin #stdout 0s 2052KB
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Standard input is empty
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Finished
https://ideone.com/bud3dI
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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