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  1. #include <iostream>
  2. #include <cstdlib>
  3. #include <ctime>
  4. #include <cmath>
  5. using namespace std;
  6.  
  7. int main() {
  8.     srand(time(0)); 
  9.     int N[] = {1000, 10000, 100000};
  10.  
  11.     for (int n : N) {
  12.         int inside = 0;
  13.         for (int i = 0; i < n; i++) {
  14.             double x = (double) rand() / RAND_MAX;
  15.             double y = (double) rand() / RAND_MAX;
  16.             if (x*x + y*y <= 1) inside++;
  17.         }
  18.         double pi = 4.0 * inside / n;
  19.         cout << "N=" << n << " --> π ≈ " << pi 
  20.              << " , Error = " << fabs(M_PI - pi) << endl;
  21.     }
  22.     return 0;
  23. }
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin 
Standard input is empty
stdout 
N=1000 --> π ≈ 3.2 , Error = 0.0584073
N=10000 --> π ≈ 3.1296 , Error = 0.0119927
N=100000 --> π ≈ 3.1334 , Error = 0.00819265
https://ideone.com/T4gyZR
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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