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approximation of pi

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umeshtangnu
I am trying to write a program the approximates pi and outputs each value of pi based on how many terms and how often (for instance if you entered 10 terms and for each 2 steps then pi would output
the 2nd term for pi
the 4th term for pi
the 6th term for pi
the 8th term for pi
the 10th term for pi

I am having a really hard time with getting the "number" (2,4,6,8,10) to output and getting the pi value to be accurate based on how often. I don't understand loops very well. Can anyone help me learn about them or help guide me in the right direction. (should I be using for loops or while loops or do while loops I have no idea)

Code:

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

    void printMessage(string);
    int returnNumber(string);

int main()

{

    char again;
    int termspi,
        steps,
        num;
    int countDenominator;
    float pi = 0.0,   
          divisor = 0.0,
          count;
    const double NUMERATOR = 4.0;

    cout << " Program will approximate Pi ";
    cout << endl << endl;   

    termspi = returnNumber ("Enter the number of terms to use: ");
    cout << endl << endl;

    steps = returnNumber("Display Pi after every how many steps?: ");

cout << "RESULTS" << endl;
int interval;
interval += steps;
    for (count = 1.0, num = 1; num <= termspi; num++)
       
 {
        if (num % 2 == 0)
           pi -= NUMERATOR/count;
        else
          pi += NUMERATOR/count;
         
           if (steps != 0)
           steps = steps * interval;
           interval +=1;
        cout << fixed << showpoint;
        cout << steps << " PI = " << setprecision(9) << pi << endl;
        count += 2.0;
       
} 




   
while (pi >= termspi)
cout << pi << endl;

   


    do
{
        cout << "Enter Y to run program again" << endl;
        cout << "(or any other key to exit)" << endl;
        cin >> again;
}
    while ((again == 'Y') || (again == 'y'));
    return 1
    ;
}

 

void printMessage(string msg)
{
     cout << msg;
}

 

int returnNumber(string msg)
{
     int num;
     cout << msg;
     cin >> num;
     
     while (num < 1){
         cout << "Your input is not valid !!!" << endl;
         cout << "Please Re-enter a positive non zero number: ";
         cin >> num;}
         cout << endl;
     return num;
}
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