[Dev-C++] calculating PI

[Noorez K. <dar...@ho...>]

trying to make something to calculate PI to a large place value. The compile 
error is on the marked line

#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
  const double numerator = 4;
  unsigned double PI = 4;  // short, signed or unsigned invalid for `PI'

  bool add = false;

  for(double i = 3; i < 999999999; i+=2)
  {
    if( add )
    {
      PI += numerator/i;
      add = false;
    }
    else
    {
      PI -= numerator/i;
      add = true;
    }
  }
  cout << PI << endl << endl;
  system("pause");
}

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