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  1. // Most common random functions. (1.00)
  2.  
  3. #include <random>
  4. #include <iostream>
  5. using namespace std;
  6.  
  7. thread_local default_random_engine s_re(random_device{}());
  8.  
  9. // Real in the range [0, 1) (exclusive).
  10. double randreal() {
  11.     uniform_real_distribution<double> pick(0.0, 1.0);
  12.     return pick(s_re);
  13. }
  14.  
  15. // Integer in the range [lo, hi] (inclusive).
  16. int randint(int lo, int hi) {
  17.     uniform_int_distribution<> pick(lo, hi);
  18.     return pick(s_re);
  19. }
  20.  
  21. // Boolean with probability {p true | (1-p) false}.
  22. bool randbool(double p) {
  23.     bernoulli_distribution pick(p);
  24.     return pick(s_re);
  25. }
  26.  
  27. // Show.
  28.  
  29. int main() {
  30.     int n = 10;
  31.     for (int i = 0; i < n; i++)
  32.         cout << randreal() << ' ';
  33.     cout << endl;
  34.     for (int i = 0; i < n; i++)
  35.         cout << randint(-n/2, n/2) << ' ';
  36.     cout << endl;
  37.     for (int i = 0; i < n; i++)
  38.         cout << randbool(0.5) << ' ';
  39.     cout << endl;
  40. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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0.356388 0.691842 0.421792 0.342169 0.732448 0.121107 0.289215 0.179304 0.856747 0.478543 
4 -3 -5 -5 4 5 2 5 0 1 
1 1 0 0 1 0 0 1 1 0
https://ideone.com/vlzK3c
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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