//---------------------------------------------------
// Purpose: Calculate loan payments using loops. 
// Author:  John Gauch
//---------------------------------------------------
#include <iomanip>
#include <iostream>
using namespace std;

int main()
{
   // Get loan amount
   float loan_amount = 1;
   do 
   {
      cout << "enter loan amount (> 0): ";
      cin >> loan_amount;
   }
   while (loan_amount <= 0);
   
   // Get monthly payment
   float payment = 1;
   do 
   {
      cout << "enter monthly payment (> 0): ";
      cin >> payment;
   }
   while (payment <= 0);
   
   // Get interest rate
   float interest_rate = 1;
   do 
   {
      cout << "enter annual interest rate (0..100): ";
      cin >> interest_rate;
   }
   while ((interest_rate < 0) || (interest_rate > 100));
   
   // Loop printing payment schedule
   cout << setprecision(2) << fixed << "Month\tPayment\tAmount\n";
   for (int month=1; loan_amount > 0; month++)
   {
      loan_amount *= (1 + interest_rate/1200);
      if (loan_amount < payment)
         payment = loan_amount;
      loan_amount -= payment;
      cout << month 
           << "\t$" << payment
           << "\t$" << loan_amount << endl;
   }
}