Why doesn't my program work?

The goal is to execute this but my program doesn't execute the results. "Here is your answer:

The future value of 50 weekly payments of
$25.55 at 2.375% is $1292.49."
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This program will calculate the future value of N
weekly payments of P dollars at annual interest
rate R.

You will be prompted to enter P, R, and N (in that
order) and then the future value will be
calculated and written to the screen.

You must now enter the amount of the payment P in
decimal form (for example: 54.55).  Do *not*
include a dollar sign ($).  Do *not* include any
commas.

Enter P, the amount of each weekly payment here ==> P = 25.55

Now you must enter the annual interest rate in
decimal form (for example: 8.125).  Do *not*
include a percent sign (%).  Do *not* include any
commas.

Enter R, the annual interest rate here ==> R = 2.375

Now you must enter the number of weekly payments
as a whole positive integer (for example: 45).  Do *not*
include a decimal point or any commas

Enter N, the number of weekly payments, here ==> N = 50

Here is your answer:

The future value of 50 weekly payments of
$25.55 at 2.375% is $1292.49.


Here's my program.
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#include <iostream>
#include <cmath>

using namespace std ;


/* PROTOTYPES */

void   PrintDirections() ;
/* Exactly what this function must do:
 Print directions for the user of the program. */

double GetPmt() ;
/* Exactly what this function must do:
 Prompt the user to enter the amount
 of the weekly payment, read it in,
 and return it to the caller. */

double GetRate() ;
/* Exactly what this function must do:
 Prompt the user to enter the amount
 of the annual interest rate, read it in,
 and return it to the caller. */

int GetNumWeeks() ;
/* Exactly what this function must do:
 Prompt the user to enter the number
 of weekly payments, read it in,
 and return it to the caller. */

double Compute_FV(double P, double R, int N)  ;
/* Exactly what this function must do:
 Return the future value of N payments
 of P dollars at annual interest rate
 percentage R. */

void Report_FV(double P, double R, int N, double fv) ;
/* Exactly what this function must do:
 Report to the user -- tell the user
 that fv is the future value of N payments
 of P dollars at annual interest rate
 percentage R. */

/* **************************************** */
/*                 MAIN                     */
/* **************************************** */

int main ()
{
    double pmt, rate ;
    int weeks;
    
    PrintDirections();
    
    pmt = GetPmt() ;
    
    rate = GetRate() ;
    
    weeks = GetNumWeeks() ;
    
    
}



/* **************************************** */
/*               PRINT DIRECTIONS           */
/* **************************************** */

/* Exactly what this function must do:
 Print directions for the user of the program. */

void PrintDirections()
{
    
    cout << endl ;
    cout << "This program will calculate the futrue calue of N\n" ;
    cout << "weekly payments of P dollars at annual interest\n" ;
    cout << "rate R." << endl ;
    cout << endl ;
    cout << "You will be prompted to enter P, R, and N (in that\n" ;
    cout << "order) and then the future value will be\n" ;
    cout << "calculated and written to the screen." << endl ;
    cout << endl ;
    
}



/* **************************************** */
/*                    GETPMT                */
/* **************************************** */

/* Exactly what this function must do:
 Prompt the user to enter the amount
 of the weekly payment, read it in,
 and return it to the caller. */

double GetPmt()
{
    
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);
    
    double pmt ;
    
    cout << endl ;
    cout << "You must now enter the amount of the payment P in\n" ;
    cout << "decimal form (for example: 54.55).  Do *not*\n" ;
    cout << "include a dollar sign ($).  Do *not* include any\n" ;
    cout << "commas." << endl ;
    cout << endl ;
    cout << "Enter P, the amount of each weekly payment here ==> P = " ;
    cin >> pmt ;
    
    return pmt ;
    
}



/* **************************************** */
/*                    GETRATE               */
/* **************************************** */

/* Exactly what this function must do:
 Prompt the user to enter the amount
 of the annual interest rate, read it in,
 and return it to the caller. */

double GetRate()
{
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(3);
    
    double rate ;
    
    cout << endl ;
    cout << "Now you must enter the annual interest rate in\n" ;
    cout << "decimal form (for example: 8.125).  Do *not*\n" ;
    cout << "include a percent sign (%).  Do *not* include any\n" ;
    cout << "commas." <<endl ;
    cout << endl ;
    cout << "Enter R, the annual interest rate here ==> R = " ;
    cin >> rate ;
    
    return rate ;
}



/* **************************************** */
/*              GETNUMWEEKS                 */
/* **************************************** */

/* Exactly what this function must do:
 Prompt the user to enter the number
 of weekly payments, read it in,
 and return it to the caller. */

int GetNumWeeks()
{
    int weeks ;
    
    cout << endl ;
    cout << "Now you must enter the number of weekly payments\n" ;
    cout << "as a whole positive integer (for example: 45).  Do *not*\n" ;
    cout << "include a decimal point or any commas.\n" ;
    cout << endl ;
    cout << "Enter N, the number of weekly payments, here ==> N = " ;
    cin >> weeks ;
    
    return weeks ;
    
}



/* **************************************** */
/*              COMPUTE_FV                  */
/* **************************************** */

/* Exactly what this function must do:
 Return the future value of N payments
 of P dollars at annual interest rate
 percentage R. */

double Compute_FV(double P, double R, int N)
{
    double r = R/5200 ;

    double FV = P * (pow(r + 1, N) - 1) * (r + 1) / r ;
    return FV ;
    
}



/* **************************************** */
/*              REPORT_FV                   */
/* **************************************** */

/* Exactly what this function must do:
 Report to the user -- tell the user
 that fv is the future value of N payments
 of P dollars at annual interest rate
 percentage R. */

void Report_FV(double P, double R, int N, double fv)
{
    
    cout << endl ;
    cout << "Here is your answer\n" ;
    cout << endl ;
    cout << "The future value of "<<N<<" weekly payements of\n" ;
    cout << "$"<<P<<" at "<<R<<"% is $"<<fv<<". \n" ;
    cout << endl ;
    
}
Your Compute_FV and Report_FV functions aren't being called anywhere.
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