Loan and amortization table.. how!?

[computernerd89]

Please help me. I thought this would be easy and then I started and WOAH.. I don't know.. I think I'm just confusing myself more... He wants the following:

Print a welcome message.
Loop until the user wants to leave the program.
- an input section which asks for some information including amount of the loan, the number of payments (in terms of months), and the annual interest rate.
- Table: For example, given the amount of the loan is 10000, the annual interest rate is 8% and the number of payments is 12, a table similar to the following will be generated

Month     Paid Principal        Paid Interest     New Balance
1              803.22                66.67            9196.78
2              808.57	             61.31	      8388.21
3              813.96                55.92            7574.25
..             .......               ......             ......
12             864.12                 5.76              -0.00

etc you don't know how many months user will input...


-an output section to print out other results such as monthly interest rate, monthly payment, accumulated interest payment over the loan period, and total payment, along with the input parameters.

Customer:		John Doe
				loan amount: 		10000.00
		 		annual interest rate: 	 8.00%
		 		number of payments: 	 12
		 		monthly interest: 	  0.6667%		
		 		accumulated interest :    438.61
		 		monthly payment : 	 869.89
		 		total payment :		10438.61

So, I don't think the second table.. with customer name will be difficult but I got stuck after asking all the input.. I blanked out. How would I make it specific for each month?? I'm a beginner so please don't be mean.. I'm trying! :/ Heres what I have so far.. I might be completely wrong.. I haven't read up on the other loops and only know the while loop right now.. but if another loop is needed let me know so I can read up on it...

********************************************************************/
#include <iostream>				//For input/output streams
#include <cmath>				//For math used in program
#include <iomanip>				//Output manipulator
#include <fstream>				//Used for output file
#include <string>				//Use with strings
using namespace std;

int main()
{	
	//Variable identifiers
	string firstName, lastName;		//User information
	int month;						//Month
	int payments;					//Number of payments
	char answer;					//Answer quit/start
	double loanAmount;				//Loan amount
	double anIntRate;				//Yealy interest Rate
	double monIntRate;				//Monthly interest rate
	double monthPayment;			//Monthly payment
	double balance;					//Balance due
	double monthPrinciple;			//Monthly principle paid
	double monthPaidInt;			//Month interest paid


	


		cout<<"                            River Bank                          "
		<<endl<<endl;
	cout<<"Hello and welcome to River Bank's electronic"
		<<" loan amortization calculator. Here we will"
		<<" make a table for you when given the amount"
		<<" of the loan, the interest rate, and the"
		<<" number of payments you wish to have."<<endl;

	
	while (true)
	{
		//Ask user if they want to start or quit
		cout<<"Want to start or do you want to quit?"
			<<" Enter 's' for start, or 'q' to quit."<<endl;
		cin>>answer;

		
		//If letter s is chosen
		if (answer == 's')
		{	cout<<"Okay.. we will first need some basic"
				<<" information about you and your loan.\n\n";
			
			//Ask user for first name
			cout<<"What is your first name?"<<endl;	
			cin>>firstName;
			//Ask user for last name
			cout<<"What is your last name?"<<endl;
			cin>>lastName;
			//Ask user for the loan amount
			cout<<"What is the full amount of your loan?"<<endl;
			cin>>loanAmount;
			//Ask user for the interest rate
			cout<<"What is the annual interest rate on your loan?"<<endl;
			cin>>anIntRate;
			//Ask user for the amount of payments
			cout<<"How many payments do you want to make"
				<<" to pay this loan off? Please answer"
				<<" me with the number of months."<<endl;
			cin>>payments;

			
				
				
			//Calculations
			//Monthly interest rate
			monIntRate = ((anIntRate/100)/12);
			//Monthly payment
			monthPayment = (loanAmount * monIntRate * (pow(1+monIntRate, payments)
				/(pow (1+monIntRate, payments)-1)));
			//Amount paid to interest each month
			monthPaidInt = balance * monIntRate;
			//Amount paid to principle
			monthPrinciple = monthPayment-monthPaidInt;
			//New balance due
			balance = balance - monthPrinciple;

			month=1;
			cout<<setw(4)<<right<<month<<setw(7)<<right<<monthPrinciple<<setw(7)<<right<<monthPaidInt<<setw(8)<<right<<balance;
				






			






			


			cout<<"Do you want to do this again? (y/n) => "; 
			cin>>answer;				//reuse the answer variable
				
			if (answer != 'y' && answer != 'Y')
			{
				//stop if the choice is not 'y' or 'Y'
				cout<<"Thank you for visiting River Bank's"
				<<" electronic loan amortization calculator"
				<<". Have a wonderful day and come visit us"
				<<" again soon for all your banking needs."<<endl; 
						break;	
			}

		
		//If user chooses to quit program
		else
			cout<<"Thank you for visiting River Bank's"
				<<" electronic loan amortization calculator"
				<<". Have a wonderful day and come visit us"
				<<" again soon for all your banking needs."<<endl;
	
	
		}

	return 0;



	}


}

[firedraco]

FYI: When you get your doubles, you can't put in values like "8.00%", you will either have to divide by 100.0 yourself or tell them to input a value like 0.08.

I would probably just create a for loop (you can read up on that if you want), that increments until you get to the numbers of months they specified, calculating the interest/payments etc the way you are currently (although I haven't actually checked your formulas). You will probably need a variable like "temp_principal" that stores the new principal for calculation of interest etc.