C++

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
	  cout << setprecision(25);
	  long double i=3;
	  long double n=0;
	  long double pi=4;
	  while(n==0)
	  {
	    pi=pi-4/i;
	    i=i+2;
	    pi=pi+4/i;
	    i=i+2;
	    cout << pi << endl;
	  }
	  return 0;
}

PHP

 $i = 3;
 $pi = 4;
 $counter = 20;
 while ($counter > 0) {
	  $counter--;
	  $pi = $pi - (4 / $i);
	  $i = $i + 2;
	  $pi = $pi + (4 / $i);
	  $i = $i + 2;
	  echo "$pi<br />";
 }

Output