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  1. #include <stdio.h>
  2.  
  3. static unsigned int x = 123456789;
  4. static unsigned int y = 362436069;
  5. static unsigned int z = 521288629;
  6. static unsigned int w = 88675123;
  7.  
  8. unsigned int randint(void) {
  9. 	unsigned int t;
  10. 	t = (x ^ (x << 11));
  11. 	x = y; y = z; z = w;
  12. 	w = (w ^ (w >> 19)) ^ (t ^ (t >> 8));
  13. 	return w;
  14. }
  15.  
  16. int main(void) {
  17. 	unsigned int max = 0x56000000u;
  18. 	unsigned int blocksize = max / 16;
  19. 	int count[16] = {0};
  20. 	int i;
  21. 	for (i = 0; i < 160000; i++) {
  22. #if 0
  23. 		unsigned int value = randint() % max;
  24. #else
  25. 		unsigned int value;
  26. 		int ok = 0;
  27. 		unsigned int r = (0xffffffffu % max + 1) % max;
  28. 		do {
  29. 			unsigned int x = randint();
  30. 			if (r == 0 || x < 0xffffffff - (r - 1)) { ok = 1; value = x % max; }
  31. 		} while (!ok);
  32. #endif
  33. 		count[value / blocksize]++;
  34. 	}
  35. 	for (i = 0; i < 16; i++) {
  36. 		printf("%2d %8d\n", i, count[i]);
  37. 	}
  38. 	return 0;
  39. }
  40.  
Success #stdin #stdout 0.01s 5308KB
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stdin
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Standard input is empty
stdout
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 0     9842
 1    10070
 2    10015
 3     9920
 4    10081
 5     9930
 6    10118
 7    10081
 8    10010
 9    10027
10     9874
11    10075
12     9987
13     9944
14     9969
15    10057
https://ideone.com/QnwktD
language:
C (gcc 8.3)
created:
1 year ago
visibility:
secret

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