Re: [Dev-C++] calculating PI

[Alfred P. R. <al...@ya...>]

Hi Noorez,
 
Is there such a thing as an unsigned double?  IMHO, floats and doubles are always signed. 
There's also a switch for 12 byte and 16 byte long doubles, if that helps.  Try GCC --target-help.  
 
I compiled and ran your program as a new project using the File-->New-->Project...-->Console Application feature, just deleting the keyword unsigned, adding a line for clarity at the top to show that something is going on, and a precision of 15 decimal digits to the output statement.  iomanip contains the definitions to setprecision().
 
#include <cstdlib>
#include <iostream>
#include <iomanip>
using namespace std;
 
int main(int argc, char *argv[])
{
  const double numerator = 4;
  double PI = 4;  // short, signed or unsigned invalid for PI.
  bool add = false;
  cout << "Running..." << endl;
  for(double i = 3; i < 999999999; i+=2)
  {
    if( add )
    {
      PI += numerator/i;
      add = false;
    }
    else
    {
      PI -= numerator/i;
      add = true;
    }
  }
  cout << setprecision(15) << PI << endl << endl;
  system("PAUSE");
  return EXIT_SUCCESS;
}

It worked fine!

Noorez Kassam <dar...@ho...> wrote:
trying to make something to calculate PI to a large place value. The compile 
error is on the marked line

#include 
#include 
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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Alfred P. Reaud