[apfroggy0408]

I'm currently taking the APCS course at my school, and we've done some work with classes and such. I'm getting an error and I don't know how to resolve it. here's the code.

Code:

/**
 * @(#)WatchInterest.java
 *
 *
 * @author 
 * @version 1.00 2007/12/11
 */

import java.util.*;
public class WatchInterest {

    public static void main(String args[]) 
    {
    	Scanner input = new Scanner(System.in);
    	
    	int choice;
    	double principal;
    	double yearlyInterest;
    	int paybackYears;
    	double monthlyPmt;
    	
    	System.out.println("Select on of the following options");
    	System.out.println();
    	System.out.println("[1]	Monthly Loan Payment Computation");
    	System.out.println("[2]	Amortization Schedule");
    	System.out.println("[3]	Credit Card Pay-Off Schedule");
    	System.out.println();
    	System.out.println("Enter your choice: ");
    	choice = input.nextInt();
    	System.out.println();
    	
    	switch (choice)
    	{
    		case 1:
    			System.out.println("Enter Loan Amount: ");
    			principal = input.nextDouble();
    			System.out.println("Enter Annual Percent: ");
    			yearlyInterest = input.nextDouble();
    			System.out.println("Enter Years to Pay Back: ");
    			paybackYears = input.nextInt();
    			Interest loan1 = new Interest(principal, yearlyInterest, paybackYears,0);
    		 ---> loan1.computePayment();
    			break;
    		
    		case 2:
    			System.out.println("Enter principle balance: ");
    			principal = input.nextDouble();
    			System.out.println("Enter annual percent: ");
    			yearlyInterest = input.nextDouble();
    			System.out.println("Enter monthly payment: ");
    			monthlyPmt = input.nextDouble();
    			Interest loan2 = new Interest(principal, yearlyInterest, 0, monthlyPmt);
    			loan2.amortization();
    			break;
    			
    		case 3:
    			System.out.println("Enter credit card balance: ");
    			principal = input.nextDouble();
    			System.out.println("Enter annual percent: ");
    			yearlyInterest = input.nextDouble();
    			Interest loan3 = new Interest(principal, yearlyInterest, 0, 0);
    			loan3.creditCard();
    			break;
    			}
    			System.out.println();
    	}
    }
class Interest
{
	private double principal;
	private double percent;
	private int years;
	private double monthlyPmt;
	private int months;
	private int pmtNr;
	private double monthlyRate;
	private double interestPmt;
	private double principalPmt;
	private double totalPmt;
	private double totalInt;
	
	public Interest(double la, double yi, int py, double mp)
		//do not alter anythign in the constructor
	{
		principal = la;
		percent = yi;
		years = py;
		monthlyPmt = mp;
		monthlyRate = percent/1200;
		months = years * 12;
		pmtNr = 0;
	}
	
	private double round(double x)
	{
		return (double) Math.round(100*x) / 100;
	}
	
	public void computePayment(double la, double yi, int py, double mp)
	{
		System.out.println();
		System.out.println("Monthly Loan Payment Computation");
		System.out.println();
		
		totalPmt = ((yi*Math.pow((1+yi),mp))/(Math.pow((1+yi),mp)-1))*la;
		
		
		
		System.out.println("Loan Amount: " + principal);
		System.out.println("Yearly Interest: " +percent);
		System.out.println("Payback Years: " +years);
		System.out.println("Monthly Payment: " +monthlyPmt);
		System.out.println("Total Payments: " +totalPmt);
		System.out.println("Total Interest: " +totalInt);
	}
	
	public void amortization()
	{
		System.out.println();
		System.out.println("Amortization Schedule");
		System.out.println();
		System.out.println("Loan Amount: " + principal);
		System.out.println("Yearly Interest: " + percent);
		System.out.println("Monthly Payment: " +monthlyPmt);
		
		do
		{
				System.out.println(pmtNr+"     \t"+monthlyPmt+"     \t"+interestPmt+"     \t"+principalPmt+"     \t"+principal);
		}	
			while (principal > 0);
			
			System.out.println("Payback Months: " +pmtNr);
			System.out.println("Total Pyaments: " +totalPmt);
			System.out.println("Total Interest: " +totalInt);
		
		}
	
	
	public void creditCard()
	{
		System.out.println();
		System.out.println("Credit Card Pay-Off Schedule");
		System.out.println();
		System.out.println("Yearly Interest: " +percent);
		
		do
		{
			System.out.println(pmtNr+"     \t"+monthlyPmt+"     \t"+interestPmt+"     \t"+principalPmt+"     \t"+principal);
		}
		while (principal > 0 );
		
		System.out.println("Payback Months: " +pmtNr);
		System.out.println("Total Pyaments: " +totalPmt);
		System.out.println("Total Interest: " +totalInt);
	}
	}

The problem is occuring in the first switch case and the exact error is.

Code:

computePayment(double,double,int,double) in Interest cannot be applied to ()

Thanks for all help.