/* face-value calculator for 1711B
98/9/23
To calculate the face value of a consumer loan.
Method use the formula:

  face_value = received / (1.0 - i_rate*(loan_time/12.0));

where received is received by the consumer i_rate is the interest rate (%)
and loan_time is the duration in months.
*/

#include <iostream.h>
const int dollar = 2;

int main()
{ double i_rate_percent, i_rate, face_value,
	  received,         // by consumer
	  payment;          //monthly
  int loan_time;          // in months
  char response;


do
 {
  //get inputs
  cout << "Type in the loan amount required (decimal number), \n";
  cout << "the interest rate (%), and the duration in months>" << endl;
  cin >> received >> i_rate_percent >> loan_time;

  //trap input errors
  if (( received > 0.0 ) && (i_rate_percent > 0.0) && (loan_time > 0))
	   {
		// calculate
		i_rate = i_rate_percent / 100.0;
		face_value = received / (1.0 - i_rate*(loan_time/12.0));
		payment = face_value/loan_time;

		// echo inputs and report

	cout << endl <<"For a loan of $" << received << endl;
	cout         <<"          over " << loan_time << " months" << endl;
	cout         <<"  at a rate of " << i_rate_percent << "percent\n" << endl;
	cout.setf(ios::fixed);
	cout.setf(ios::showpoint);
	cout.precision(dollar);
	cout         <<"the total borrowed is  $" << face_value << endl;
	cout.setf(ios::fixed);
	cout.setf(ios::showpoint);
	cout.precision(dollar);

	cout         <<"the monthly payment is $" << payment << endl << endl;
	}
  else
	 cout << "Invalid entry: all values must be positive" << endl << endl;

  cout << "If you want to try again input Y, otherwise input N" << endl;
  cin >> response;

 }
while ((response == 'Y')||(response == 'y');  // allows lower-case y response
return 0;
}