Can someone please help me with this?? I have created this amortization schedule, it works fine displays great and shows the payment amount. However, i cannot get it to subtract the principal payment, interest payment, or get it to subtract from the principal amount each month. HELP.

Thanks,

//*Design

//This program calculates the monthly payment based on

//loan amount, annual interest rate, and the length of the

//loan in years. The user will enter amount of the loan

//annual interest rate, and duration of the loan. This program

//will also display an amortization schedule.

#include <iostream>

#include <iomanip>

#include <math.h>

using namespace std;

int main ()

{

double principal_amount = 0;

double rate =0;

int years;

double total_payments = 0;

double monthly_payment = 0;

double payment_interest = 0;

double payment_principal= 0;

double amount_owed = 0;

double intRate = 0;

int i = 1;

do

{

cout << " Enter Principal of loan: ";

cin >> principal_amount;

cout << " Enter yearly interest rate: ";

cin >> intRate;

cout << " Enter Duration of Loan: ";

cin >> years;

//Calculate monthly payment.

rate = (intRate /1200);

total_payments = (years * 12);

monthly_payment = (rate + ((rate/((pow(1+rate, total_payments))-1)))) * principal_amount;

payment_interest = (rate /1200) * principal_amount;

payment_principal = (monthly_payment - payment_interest);

amount_owed = (principal_amount - payment_principal);

//Display monthly payment.

cout << " The monthly payment is " << monthly_payment << ". \n";

cout << " Payment # " << setw(12) << " Payment " << setw(12) << " Payment-Interest " << setw(12) << " Payment-Principal " << setw(12) << " Amt Owed " << endl;

(i = 0; i < (years * 12); i++)

{

monthly_payment = (rate + ((rate/((pow(1+rate, total_payments))-1)))) * principal_amount;

payment_interest = ((rate /100)*(1/12))*principal_amount;

payment_principal = (monthly_payment - payment_interest);

amount_owed =(principal_amount - payment_principal);

//Display Results

cout << " " << (i+1) << setw(15) << setiosflags(ios::fixed) << setprecision(2) << monthly_payment << setw(9) << setiosflags(ios::fixed) << setprecision(2) << payment_interest << setw(18) << setiosflags(ios::fixed) << setprecision(2) << payment_principal << setw(26) << setiosflags(ios::fixed) << setprecision(2) << amount_owed << endl;

}

}while(i < (years*12));

return 0;

}[]

## 2 Replies - 3804 Views - Last Post: 11 March 2009 - 05:06 PM

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**Replies To:** Loan amortization

### #2

## Re: Loan amortization

Posted 11 March 2009 - 05:05 PM

What exactly do you want the program to do? Where are you subtracting the principal from? Could you gives us a brief rundown of how this loan amortization works?

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### #3

## Re: Loan amortization

Posted 11 March 2009 - 05:06 PM

principal_payment -= the_amount_to_subtract;

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