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  1. #include <iostream>
  2. #include <random>
  3.  
  4. #include <map>
  5. #include <iomanip>
  6.  
  7. int keep_out_of_range(int low, int high, int number)
  8. {
  9. 	if (number >= low && number <= high)
  10. 	{
  11. 		int halfway = (low + high) / 2;
  12. 		int halfrange = (high - low) / 2;
  13. 		if (number > halfway)
  14. 			number += halfrange;
  15. 		else
  16. 		{
  17. 			number -= halfrange + 1;
  18. 		}
  19. 	}
  20. 	return number;
  21. }
  22.  
  23. int main()
  24. {
  25.   const int MinGen = -100;
  26.   const int MaxGen =  100;
  27.   std::default_random_engine generator;
  28.   std::uniform_int_distribution<int> distribution(MinGen, MaxGen);
  29.  
  30.  
  31.   const int nrolls = 10000; // number of experiments
  32.  
  33.   // generate numbers, make a histogram of distribution
  34.   std::map<int, int> histogram;
  35.   for (int i = 0; i < nrolls; i++) {
  36.  
  37.     int random_number = distribution(generator); // here's where # is generated
  38.     random_number = keep_out_of_range(10, 20, random_number);
  39.  
  40.     ++histogram[random_number];
  41.   }
  42.  
  43.   // print the histogram
  44.   for (auto p : histogram) {
  45.     std::cout << std::fixed << std::setprecision(1) << std::setw(2)
  46.               << p.first << ' ' << std::string(p.second/(nrolls/(10*(MaxGen-MinGen))), '*') << '\n';
  47.   }
  48.   return 0;
  49. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
-100 ***********
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https://ideone.com/JpWMYK
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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