Real Application (part 2)

    public static void main(String args[]) throws IOException
    {   DataInputStream din = new DataInputStream(System.in);
        System.out.println("Enter principal (e.g. 8250.00 :");
        double bal = new Double(din.readLine()).doubleValue();
        System.out.println("Enter annual interest rate (e.g. 10.25) :");
        double intyr = new Double(din.readLine()).doubleValue() / 100.;
        System.out.println("Enter number of years :");
        short nyears = (short) new Integer(din.readLine()).intValue();
        System.out.println("\nprincipal=" + bal + "  interest=" + intyr
                            + "  years=" + nyears);
        double intmo = intyr / 12.;
        int npmts = nyears * 12;
        double pmt = bal * (intmo / (1. - Math.pow(1. + intmo, -npmts)));