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  1. #include <iostream>
  2. #include <cstdlib>
  3. #include <ctime>
  4.  
  5. using namespace std;
  6.  
  7. struct OddsEntry
  8. {
  9. 	int multiplier;
  10. 	int threshold;
  11. };
  12.  
  13. OddsEntry RollThresholds[] =
  14. {
  15. 	{ 4, 5 },
  16. 	{ 8, 6 },
  17. 	{ 16, 7 },
  18. 	{ 32, 8 },
  19. 	{ 64, 9 }
  20. };
  21.  
  22. int RollD10()
  23. {
  24. 	float random = (float(rand()) / RAND_MAX) * 10.f;
  25. 	return(int(random));
  26. }
  27.  
  28. int main() {
  29. 	srand(time(0));
  30. 	static constexpr int Iterations = 5000000;
  31. 	for(const OddsEntry& entry : RollThresholds)
  32. 	{
  33. 		cout << "For multiplier " << entry.multiplier << "X, little one wins ";
  34. 		int wins = 0;
  35. 		for(int iteration = 0; iteration < Iterations; ++iteration)
  36. 		{
  37. 			int littleScore = 0;
  38. 			int bigScore = 0;
  39. 			while((littleScore < 6) && (bigScore < 6))
  40. 			{
  41. 				const int roll = RollD10();
  42. 				const int increment = (RollD10() < 6) ? 1 : 2;
  43. 				if(roll < entry.threshold)
  44. 				{
  45. 					bigScore += increment;
  46. 				}
  47. 				else
  48. 				{
  49. 					littleScore += increment;
  50. 				}
  51. 			}
  52. 			if(littleScore >= 6)
  53. 			{
  54. 				wins++;
  55. 			}
  56. 		}
  57. 		cout << (float(wins) / Iterations) * 100.f << "%\n";
  58. 	}
  59. 	return 0;
  60. }
Success #stdin #stdout 4s 4460KB
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stdin
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Standard input is empty
stdout
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For multiplier 4X, little one wins 49.9582%
For multiplier 8X, little one wins 29.0432%
For multiplier 16X, little one wins 12.7799%
For multiplier 32X, little one wins 3.5343%
For multiplier 64X, little one wins 0.34936%
https://ideone.com/lBNelQ
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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