main3.cpp

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#include <iostream>
#include "random.h"
using namespace std;
 
int main() {
 
  int n = 1000000;
  int count = 0;
 
  for(int i = 0; i < n; ++i) {
    double x, y;
    randomPoint(x, y);
    if(x*x + y*y < 1) {
      ++count;
    }
  }
 
  cout << 4.0 * count / n << endl;
 
  return 0;
}