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  1. #include <iostream>
  2. #include <cstdlib>   
  3. #include <ctime>     
  4.  
  5. using namespace std;
  6.  
  7. // Function to estimate Pi using Monte Carlo
  8. double monteCarloPi(int N) {
  9.     int inside = 0;
  10.     for (int i = 0; i < N; i++) {
  11.         double x = (double)rand() / RAND_MAX; // random [0,1)
  12.         double y = (double)rand() / RAND_MAX;
  13.         if (x*x + y*y <= 1.0) {
  14.             inside++;
  15.         }
  16.     }
  17.     return 4.0 * inside / N;
  18. }
  19.  
  20. int main() {
  21.     srand(time(0)); // seed random generator
  22.  
  23.     int Ns[] = {1000, 10000, 100000};
  24.  
  25.     for (int i = 0; i < 3; i++) {
  26.         int N = Ns[i];
  27.         double pi_est = monteCarloPi(N);
  28.         cout << "N = " << N << " -> Estimate of Pi = " << pi_est << endl;
  29.     }
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
N = 1000 -> Estimate of Pi = 3.092
N = 10000 -> Estimate of Pi = 3.142
N = 100000 -> Estimate of Pi = 3.14756
https://ideone.com/sj3tgC
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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