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Thread: New to Programming

  1. #1
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    Default New to Programming

    Hi, I'm taking a beginning programming class for Java and can't figure out what errors I made in my first program. This is supposed to be a very simple program and I know I probably look stupid getting confused on it, so please don't bother making fun of me.
    import java.util.*;
     
    public class proj1
    {
            public static void main(String[] args) 
            {	double monthlyPayment, annualInterest, 
    		       outstandingBalance, accountBalance, paidInterest,
                           paidPrincipal;
     
    		annualInterestRate = .0625;
    		paidInterest = (annualInterest / 12) * 
                                      outstandingBalance;
    		paidPrincipal = monthlyPayment - paidInterest;
    		accountBalance = outstandingBalance - paidPrincipal;
     
    		System.out.println("Enter this month's payment:");
     
    		Scanner keyboard = new Scanner(System.in);
    		monthlyPayment  = keyboard.nextDouble();
     
    		System.out.println("Enter the outstanding balance of the account:");
     
    		Scanner keyboard = new Scanner(System.in);
    		outstandingBalance = keyboard.nextDouble();
     
    		System.out.println("Here is a breakdown of the 
    payment:");
    		System.out.println("Interest paid-" paidInterest);
                    System.out.println("Amount applied to principal" 
    paidPrincipal);
    		System.out.println("After the payment, the account 
    balance is:" accountBalance);
    	}
    }

    when I tried compiling, this is what I got:

    javac proj1.java
    proj1.java:26: unclosed string literal
    System.out.println("Here is a breakdown of the
    ^
    proj1.java:26: ';' expected
    System.out.println("Here is a breakdown of the
    ^
    proj1.java:27: illegal start of expression
    payment:");
    ^
    proj1.java:27: unclosed string literal
    payment:");
    ^
    proj1.java:28: ')' expected
    System.out.println("Interest paid-" paidInterest);
    ^
    proj1.java:28: illegal start of expression
    System.out.println("Interest paid-" paidInterest);
    ^
    proj1.java:29: ')' expected
    System.out.println("Amount applied to principal"
    ^
    proj1.java:30: illegal start of expression
    paidPrincipal);
    ^
    proj1.java:31: unclosed string literal
    System.out.println("After the payment, the account
    ^
    proj1.java:31: ';' expected
    System.out.println("After the payment, the account
    ^
    proj1.java:32: unclosed string literal
    balance is:" accountBalance);
    ^
    11 errors


  2. #2
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    Default Re: New to Programming

    Next time you post, please include tags around your code such as ones in my signature.
    I've reposted your code in a readable format:
    import java.util.*;
     
    public class proj1 {
     
        public static void main(String[] args) {
            double monthlyPayment, annualInterest,
                    outstandingBalance, accountBalance, paidInterest,
                    paidPrincipal;
     
            annualInterestRate = .0625;
            paidInterest = (annualInterest / 12) * outstandingBalance;
            paidPrincipal = monthlyPayment - paidInterest;
            accountBalance = outstandingBalance - paidPrincipal;
     
            System.out.println("Enter this month's payment:");
     
            Scanner keyboard = new Scanner(System.in);
            monthlyPayment = keyboard.nextDouble();
     
            System.out.println("Enter the outstanding balance of the account:");
     
            Scanner keyboard = new Scanner(System.in);
            outstandingBalance = keyboard.nextDouble();
     
            System.out.println("Here is a breakdown of the payment:");
            System.out.println("Interest paid-" paidInterest);
            System.out.println("Amount applied to principal" paidPrincipal);
            System.out.println("After the payment, the account balance is:" accountBalance);
        }
    }

    • The keyboard object is defined twice, you only need to define keyboard once, and reuse it when you need to.
    • In-order to print variables alongside Strings, you need to use the + operator to join them together.
    • You attempt to perform paidInterest = (annualInterest / 12) * outstandingBalance; before even initialising outstandingBalance.
    • annualInterestRate isn't defined anywhere, either define it, or replace it with one of your already defined variables.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

  3. The Following User Says Thank You to newbie For This Useful Post:

    Delacratic (February 8th, 2011)

  4. #3
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    Default Re: New to Programming


    Scanner keyboard = new Scanner(System.in);
    monthlyPayment = keyboard.nextDouble();

    System.out.println("Enter the outstanding balance of the account:");

    Scanner keyboard = new Scanner(System.in);
    First error is redeclaration of the variable keyboard.


    Secondly in the code below , you are joining string with variable for that , you need to use + operator.

    System.out.println("Interest paid-"+ paidInterest);

    System.out.println("Interest paid-" paidInterest);
    System.out.println("Amount applied to principal" paidPrincipal);
    System.out.println("After the payment, the account balance is:" accountBalance);

    Third error is

    annualInterestRate = .0625;

    you hadn't declare this variable.
    Thanks and Regards
    Dan Brown

    Common Java Mistakes

  5. The Following User Says Thank You to DanBrown For This Useful Post:

    Delacratic (February 8th, 2011)

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    Default Re: New to Programming

    Not to be picky, but was there something insufficient with my post that made you feel you needed
    to repeat it? Not having a go, just very curious
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

  7. #5
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    Smile Re: New to Programming

    Not to be picky, but was there something insufficient with my post that made you feel you needed
    to repeat it? Not having a go, just very curious
    No dear.Problem is both of had posted the reply on the same time.
    Thanks and Regards
    Dan Brown

    Common Java Mistakes

  8. #6
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    Default Re: New to Programming

    Thank you both for replying, it is greatly appreciated. After attempting to fix the errors you pointed out, this is the code I have:

    import java.util.*;
     
    public class proj1
    {
            public static void main(String[] args) 
            {	double monthlyPayment, annualInterest, 
    		           outstandingBalance, accountBalance, paidInterest,
                       paidPrincipal;
     
    		annualInterest = .0625;             		
     
    		System.out.println("Enter this month's payment: ");
     
    		Scanner keyboard = new Scanner(System.in);
    		monthlyPayment  = keyboard.nextDouble();		
     
    		System.out.println("Enter the outstanding balance of the 
    account: ");
     
    		outstandingBalance = keyboard.nextDouble();  
     
    		paidInterest = (annualInterest / 12) *  
    				outstandingBalance;
    		paidPrincipal = monthlyPayment - paidInterest;
    		accountBalance = outstandingBalance - paidPrincipal;
     
    		System.out.println("Here is a breakdown of the 
    payment: ");
    		System.out.println("Interest paid- " + paidInterest);
            System.out.println("Amount applied to principal- " +
    paidPrincipal);
    		System.out.println("After the payment, the account 
    balance is: " + accountBalance);
    	}
    }

    After compiling, these are the errors I received:

    proj1.java:17: unclosed string literal
    System.out.println("Enter the outstanding balance of the
    ^
    proj1.java:17: ';' expected
    System.out.println("Enter the outstanding balance of the
    ^
    proj1.java:18: illegal start of expression
    account: ");
    ^
    proj1.java:18: unclosed string literal
    account: ");
    ^
    proj1.java:27: unclosed string literal
    System.out.println("Here is a breakdown of the
    ^
    proj1.java:27: ';' expected
    System.out.println("Here is a breakdown of the
    ^
    proj1.java:28: illegal start of expression
    payment: ");
    ^
    proj1.java:28: unclosed string literal
    payment: ");
    ^
    proj1.java:32: unclosed string literal
    System.out.println("After the payment, the account
    ^
    proj1.java:32: ';' expected
    System.out.println("After the payment, the account
    ^
    proj1.java:33: unclosed string literal
    balance is: " + accountBalance);
    ^
    11 errors
    Last edited by Delacratic; February 8th, 2011 at 01:14 PM.

  9. #7
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    Default Re: New to Programming

    It's just a simple problem you have, to fix it just put all your println contents on the same line: as such
            System.out.println("Enter the outstanding balance of the account: ");
    Or if you do want to keep print statements going on multiple lines, be sure to close off the String, use the + operator and open up the new String continuation, as such:

            System.out.println("This is a very very very very"
                    + "long String indeed...");


    Off-topic again:
    No dear.Problem is both of had posted the reply on the same time.
    Reason I said it was because your post date was: "Yesterday 07:20 AM"
    whereas mine was "06-02-2011 10:02 PM". Just saying
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

  10. The Following User Says Thank You to newbie For This Useful Post:

    Delacratic (February 8th, 2011)

  11. #8
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    Default Re: New to Programming

    Thank you very much The program works now.

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