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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 ;
}
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