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  1. // Most common random functions. (2.00)
  2.  
  3. #include <random>
  4. #include <iostream>
  5. using namespace std;
  6.  
  7. class Random {
  8.     static thread_local default_random_engine s_re;
  9.  
  10. public:
  11.     // Real in the range [0, 1) (exclusive).
  12.     static double randreal() {
  13.         uniform_real_distribution<double> pick(0.0, 1.0);
  14.         return pick(s_re);
  15.     }
  16.  
  17.     // Integer in the range [lo, hi] (inclusive).
  18.     static int randint(int lo, int hi) {
  19.         uniform_int_distribution<> pick(lo, hi);
  20.         return pick(s_re);
  21.     }
  22.  
  23.     // Boolean with probability {p true | (1-p) false}.
  24.     static bool randbool(double p) {
  25.         bernoulli_distribution pick(p);
  26.         return pick(s_re);
  27.     }
  28. };
  29.  
  30. thread_local default_random_engine Random::s_re(random_device{}());
  31.  
  32. // Show.
  33.  
  34. int main() {
  35.     int n = 10;
  36.     for (int i = 0; i < n; i++)
  37.         cout << Random::randreal() << ' ';
  38.     cout << endl;
  39.     for (int i = 0; i < n; i++)
  40.         cout << Random::randint(-n/2, n/2) << ' ';
  41.     cout << endl;
  42.     for (int i = 0; i < n; i++)
  43.         cout << Random::randbool(0.5) << ' ';
  44.     cout << endl;
  45. }
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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0.87802 0.71944 0.793862 0.89195 0.584331 0.454796 0.593583 0.239353 0.250641 0.593872 
-3 -5 -2 3 -5 4 2 -2 -2 3 
1 1 1 1 1 0 0 0 0 0
https://ideone.com/NfMIkv
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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