// COBOL Programmers Swing With Java - copyright 2005 Doke, Hardgrave, & Johnson
// Chapter 7 - Loops
// Program to compute amortization schedule
// Amortizer.java 1 JAN 05

import java.text.NumberFormat;
public class Amortizer
{
    public static void main (String args[])
    {
    // declare variables
    float balance = 1000F;
    float apr = .08F;
    int months = 6;
    float interestPaid = 0F;
    float principalPaid = 0F;
    float totalInterestPaid = 0F;
    // compute payment
    double doublePayment = (balance * (apr / 12))/ (1 - 1 / Math.pow ((1 + apr/12), months));
    float payment = (float) doublePayment;      // cast to float
    payment = roundOff (payment);  // round to cents
    // print heading
    System.out.println ("Mo Payment  Interest  Principal Balance");
    // beginning of while loop
    int monthNumber = 1;
    while (monthNumber <= months)
    {
	interestPaid = roundOff (balance * apr / 12);
	totalInterestPaid = totalInterestPaid + interestPaid;
	if (monthNumber == months)
	payment = interestPaid + balance;  // adjust last payment
	principalPaid =  payment - interestPaid;
	balance = roundOff(balance - principalPaid);
	// print a line
	System.out.print ("  " + monthNumber);
	System.out.print ("   " + payment);
	System.out.print ("     " + interestPaid);
	System.out.print ("     " + principalPaid);
	System.out.println ("     " + balance);
	monthNumber = monthNumber + 1;
    } // end of while loop
    System.out.println ("Total Interest Paid " + roundOff(totalInterestPaid));
  } // end of main method
  // roundOff method
    static public float roundOff (double value)
    {
	value = value * 100;                // move decimal 2 places to right
	// Math.round returns long - recast to float
	float roundedValue = (float) Math.round(value);
	roundedValue = roundedValue / 100;  // move decimal back to left
        return roundedValue;
    } // end roundOff
} // end of Amortizer.java