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  1. #include <iostream>
  2. #include <random>
  3. #include <vector>
  4.  
  5. int main()
  6. {
  7.  
  8.     double lower_limit = -15000;
  9.     double upper_limit = 15000;
  10.     double range = upper_limit - lower_limit ;
  11.  
  12.     std::mt19937 rng((std::random_device())());
  13.     std::uniform_real_distribution<double> dist(lower_limit, upper_limit);
  14.  
  15.     double highest_result = lower_limit -1;
  16.     double lowest_result = upper_limit + 1;
  17.  
  18.     const unsigned samples = 1000000;
  19.     std::vector<unsigned> block_count(5);
  20.  
  21.     for (unsigned i = 0; i < samples; ++i)
  22.     {
  23.         double value = dist(rng);
  24.  
  25.         if (value < lowest_result)
  26.             lowest_result = value;
  27.  
  28.         if (value > highest_result)
  29.             highest_result = value;
  30.  
  31.         for (unsigned i = 0; i < 5; ++i)
  32.         {
  33.             if (value - lower_limit < (range / 5.0) * (i + 1))
  34.             {
  35.                 ++block_count[i];
  36.                 break;
  37.             }
  38.         }
  39.     }
  40.  
  41.     std::cout << "range limit, " << lower_limit << " to " << upper_limit << '\n';
  42.     std::cout << "highest result, " << highest_result << '\n';
  43.     std::cout << "lowest result, " << lowest_result << '\n';
  44.     std::cout << "breakdown of result range by fifths for one run through\n";
  45.  
  46.     for (unsigned i = 0; i < 5; ++i)
  47.         std::cout << "to " << ((i + 1) / 5.0)*100.0 << "%: " << block_count[i] << " results\n";
  48. }
Success #stdin #stdout 0.09s 3276KB
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stdin
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Standard input is empty
stdout
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range limit, -15000 to 15000
highest result, 15000
lowest result, -15000
breakdown of result range by fifths for one run through
to 20%: 199578 results
to 40%: 199751 results
to 60%: 200452 results
to 80%: 200351 results
to 100%: 199868 results
https://ideone.com/Shkwx7
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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