Final Pi giving undesired output

mgilchrist (7)
This program is all but finished I am just having trouble figuring out how to display the last term in my sequence as a separate output after the other terms have been outputted.
I want it to give however many results and then the last result coppied and displayed as final pi.

Example:

Result:
  100: Pi = 3.131592904
  200: Pi = 3.136592685
  300: Pi = 3.138259330

Final Pi = 3.138259330


So what I am trying to do is have the 300 result # display 2 lines down on the final pi =.

This is what I have and am having trouble with line 54; please help:
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#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

	int call_prompt;
	int store_terms;
	int store_steps;

void input(string& call_prompt, int& store_terms, int& store_steps);



int main()
{
    int denominator = 3;
    int num_terms;
    int num_steps;
	int pi_num;
    double newPi = 4.0;
    bool condition = true;


	cout << " This program will approximate Pi " << endl << endl;

    string prompt= " Enter the number of terms to use: ";

    input( prompt, num_terms, num_steps );

    cout << " Results:";
    cout << endl << endl;


    for ( int pi_num = 1; pi_num <= num_terms; pi_num++ )
    {
		if ((pi_num % num_steps) == 0)
        {
            cout << fixed << showpoint << setprecision(9); 
			cout << setw(6) << pi_num << ": Pi = " << newPi << endl;
        }
        if (condition) 
        {
            newPi -= ( 4.0 / denominator );
        } 
        else 
        {
            newPi += ( 4.0 / denominator );
        }
        condition = !condition;
        denominator += 2;
    }

    cout << endl << endl;
	cout << " Final Pi = " << newPi;
	
	
	cout << endl << endl;
    system ("PAUSE");
    return 0;
}

void input(string& call_prompt, int& store_terms, int& store_steps)
{
    do 
    {

        //string call_prompt = "Enter the number of terms to use: ";

        cout << call_prompt;
        cin >> store_terms;
        cout << endl;

		// if number of terms stored = 0 output error message
        if ( store_terms <= 0 )

        cout << " Error -- invalid input" << endl << endl;

    } while ( store_terms <= 0 );

    do 
    {
        cout << " Display Pi after every how many steps? ";
        cin >> store_steps;										//store a value for number of steps 
        cout << endl;

        if ( store_steps <= 0 )						//gives a condition to follow if stored value is <= 0

        cout << " Error -- invalid input" << endl << endl;

    }while ( store_steps <= 0);						//condition to follow if steps is an exeptable #
}
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