/*
    IntCalc2.java
    David G. Klick
    September 7, 2007
    CIS 111
 
    Demonstration program which uses input, processing,
    and output - redone with methods (modules).
*/

public class IntCalc2 extends CIS111App {
    // Global variables are not ideal program design, but
    // they serve to illustrate some concepts in this program.
    private static double prin;
    private static double interest;
    private static int years;
    private static int periods;

    public static void main(String[] args) {
        // declare variables
        double amt;
      
        getInput();
        amt = calcAmt(prin, interest, years, periods);
        displayAmt(amt);
    }
   
    private static void getInput() {
        // get principal, interest, years, periods
        prin = getDouble("Enter the principal: ");
        interest = getDouble("Enter the yearly interest: ");
        years = getInt("Enter the number of years: ");
        periods = getInt("Enter the number of periods per year: ");
    }

    private static double calcAmt(double pr, double interest, int yr, int per) {
        // calculate future value
        double x = (1 + (interest / 100) / per);
        double y = (yr * per);
        double n = pr * Math.pow(x, y);
        return n;
    }

    private static void displayAmt(double total) {
        // display future value
        printf("The future value is %.2f\n", total);
    }
}