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Java errors

 
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Java errors
greenhorn100
4 Feb, 2008 - 11:55 AM
Post #1

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Posts: 7
/* Purpose:Write the program in Java (without a graphical user interface) and have it calculate the payment
amount for 3 mortgage loans:*/

I keep getting errors. The first one is cannot resolve symbol: variable loan1.

CODE

import java.io.*;
import java.util.*;
import java.text.*;


public class MortgageCalculator4
{
        public static void main(String[] args)
        {

        NumberFormat nf = NumberFormat.getCurrencyInstance();
    }

            final double amount= 200000;
            final double interest;
            final double months;
    }

             String[] Array = new String[3];


            Array[0] = loan1;
            Array[1] = loan2;
            Array[2] = loan3;

    }
            interest = .0535/12;
            months = 12*7;
            String loan1 =(amount*interest)/(1-Math.pow(1 + interest, -months));

            
            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan1));


            interest = .0550/12;
            months = 12*15;
            String loan2 =(amount*interest)/(1-Math.pow(1 + interest, -months));


            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan2));


            interest = .0575/12;
            months = 12*30;

            String loan3 =(amount*interest)/(1-Math.pow(1 + interest, -months));
            
            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan3));


    }
}
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dontKnowJava
RE: Java Errors
4 Feb, 2008 - 12:09 PM
Post #2

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you cant name your array Array name it something else and you have to declare strings before you stick them in the array or use the actual string. loan1 is not a string its an undefined variable. "loan1" is a string. String loan1; declares a string variable. but if youre using an array you probably dont need that. you also have a few extra } <-- of those ill let you figure that out.

This post has been edited by dontKnowJava: 4 Feb, 2008 - 12:13 PM
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greenhorn100
RE: Java Errors
4 Feb, 2008 - 02:49 PM
Post #3

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QUOTE(dontKnowJava @ 4 Feb, 2008 - 01:09 PM) *

you cant name your array Array name it something else and you have to declare strings before you stick them in the array or use the actual string. loan1 is not a string its an undefined variable. "loan1" is a string. String loan1; declares a string variable. but if youre using an array you probably dont need that. you also have a few extra } <-- of those ill let you figure that out.


[reply]
Thanks for the help. I'm trying to get the array to show the calculated output for loan1, loan2, and loan 3. I have changed my code a bit but still get errors.
[/reply]

/* Purpose:Write the program in Java (without a graphical user interface) and have it calculate the payment
amount for 3 mortgage loans:*/

CODE

import java.io.*;
import java.util.*;
import java.text.*;

public class MortgageCalculator4
{

        public static void main(String[] args)
    {


        NumberFormat nf = NumberFormat.getCurrencyInstance();


            
            int amount= 200000;
            double[] interest={.0535,.0550,.0575};
            int[] months={7,15,30};
            int loan1;
            int loan2;
            int loan3;



            interest = .0535/12;
            months = 12*7;
            loan1 =(amount*interest)/(1-Math.pow(1 + interest, -months));


            //print out variables
            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan1));


            interest = .0550/12;
            months = 12*15;
            loan2 =(amount*interest)/(1-Math.pow(1 + interest, -months));


            //print out variables
            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan2));


            interest = .0575/12;
            months = 12*30;
            loan3 =(amount*interest)/(1-Math.pow(1 + interest, -months));
            //print out variables

            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan3));


    }
}
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capty99
RE: Java Errors
4 Feb, 2008 - 03:12 PM
Post #4

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follow what the errors say and you see the issues :

CODE

  interest = .0550/12;
            months = 12*15;
            loan2 =(amount*interest)/(1-Math.pow(1 + interest, -months));



you have an array of 3 items called interest, so what are you trying to do with this .0550/12. add it to the array? then add, don't just set it equal to.

same for months
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dontKnowJava
RE: Java Errors
4 Feb, 2008 - 03:34 PM
Post #5

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ok that looks a little better. heres an easier way to do it. instead of typing it up 3 times set up a for loop. heres a basic calculator that uses simple interest to calculate monthly payments. if youre gonna copy it as your own make sure your teacher was asking for simple interest and make sure that logic works out right i gotta head to class myself dont have time to check it.
CODE

import java.io.*;
import java.util.*;
import java.text.*;

class MortgageCalculator
{

        public static void main(String[] args)
    {




            int amount= 200000;
            double[] rate={.0535,.0550,.0575};
            int[] years={7,15,30};
            double interest;
            double loan[] = new double[3];//you cant store a double in an int
            //i wasnt sure what method of calculating interest you used but heres how your program should
            //work im using simple interest formula i=(p)(r)(t)

            for(int i = 0; i < 3; i++)    {
                interest = amount * rate[i] * years[i];
                loan[i] = ((interest + amount) / years[i])/12;
                System.out.println("For " + amount + " at " + rate[i] + " for " + years[i] + " years, monthly paymeny is " + loan[i]);
            }


    }

}


This post has been edited by dontKnowJava: 4 Feb, 2008 - 03:39 PM
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greenhorn100
RE: Java Errors
4 Feb, 2008 - 04:20 PM
Post #6

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Joined: 24 Jan, 2008
Posts: 7
QUOTE(capty99 @ 4 Feb, 2008 - 04:12 PM) *

follow what the errors say and you see the issues :

CODE

  interest = .0550/12;
            months = 12*15;
            loan2 =(amount*interest)/(1-Math.pow(1 + interest, -months));



you have an array of 3 items called interest, so what are you trying to do with this .0550/12. add it to the array? then add, don't just set it equal to.

same for months


[reply]
Okay, I see. What I can't seem to understand is how I would equate say the 5.35% interest rate to loan1. In addition, the 84 months to loan1. Thanks for your help!
[/reply]


/* Purpose:Write the program in Java (without a graphical user interface) and have it calculate the payment
amount for 3 mortgage loans:*/

CODE

import java.io.*;
import java.util.*;
import java.text.*;

public class MortgageCalculator4
{

        public static void main(String[] args)
    {


        NumberFormat nf = NumberFormat.getCurrencyInstance();


            //declaring and contruct variables and arrays
            int amount= 200000;
            double[] interest={5.35, 5.50, 5.75};
            int[] months={7,15,30};
            int loan1;
            int loan2;
            int loan3;




            loan1 =(amount*interest)/(1-Math.pow(1 + interest, -months));


            //print out variables
            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan1));



            loan2 =(amount*interest)/(1-Math.pow(1 + interest, -months));


            //print out variables
            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan2));



            loan3 =(amount*interest)/(1-Math.pow(1 + interest, -months));
            //print out variables

            System.out.println("\t\tAmount to be financed is: " + amount);
            System.out.println("\t\tInterest Rate: " + interest);
            System.out.println("\t\tThe Term of Loan (in months): " + months);
            System.out.println("\t\tThe Monthly Payment is: " + nf.format(loan3));


    }
}
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