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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. unsigned int seed = 0xfdb462a7U;
  5. unsigned int rng()
  6. {
  7. 	seed *= 0x41c64e6dU;
  8. 	const unsigned int truncated = ((seed + 0x303aU) >> 16) & 0xff;
  9. 	seed += 0x3039U;
  10. 	return truncated & 0xff;
  11. }
  12.  
  13. unsigned int convert(unsigned int value)
  14. {
  15. 	unsigned int product = ((unsigned long long)value * (unsigned long long)0xcccccccdU) >> 32;
  16. 	unsigned int shifted = (product >> 3);
  17. 	return (shifted + (shifted << 2)) << 1;
  18. }
  19.  
  20. int main()
  21. {
  22. 	const unsigned int generated = rng();
  23. 	cout << hex << "Random number: " << generated << endl;
  24. 	cout << hex << "Final dice roll value: " << (generated - convert(generated)) + 1 << endl;
  25.  
  26. 	cout << "Division:" << endl;
  27. 	unsigned int end;
  28. 	for (unsigned int start = 0; start <= 255; start = end)
  29. 	{
  30. 		unsigned int startValue = convert(start);
  31. 		for (end = start + 1; end <= 255; ++end)
  32. 		{
  33. 			unsigned int endValue = convert(end);
  34. 			if (startValue != endValue)
  35. 			{
  36. 				break;
  37. 			}
  38. 		}
  39. 		cout << dec << "[" << start << ", " << (end - 1) << "] maps to " << startValue << endl;
  40. 	}
  41. 	return 0;
  42. }
Success #stdin #stdout 0.01s 5392KB
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stdin
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Standard input is empty
stdout
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Random number: 7
Final dice roll value: 8
Division:
[0, 9] maps to 0
[10, 19] maps to 10
[20, 29] maps to 20
[30, 39] maps to 30
[40, 49] maps to 40
[50, 59] maps to 50
[60, 69] maps to 60
[70, 79] maps to 70
[80, 89] maps to 80
[90, 99] maps to 90
[100, 109] maps to 100
[110, 119] maps to 110
[120, 129] maps to 120
[130, 139] maps to 130
[140, 149] maps to 140
[150, 159] maps to 150
[160, 169] maps to 160
[170, 179] maps to 170
[180, 189] maps to 180
[190, 199] maps to 190
[200, 209] maps to 200
[210, 219] maps to 210
[220, 229] maps to 220
[230, 239] maps to 230
[240, 249] maps to 240
[250, 255] maps to 250
https://ideone.com/TmiDFg
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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