Illegal start of expression problem + some questions about formating output.

[Reviloest]

Hey there,

So i have stumbled across this problem "illegal start of expression", i have no idea whats wrong.

And another thing- how can i customize the output so there are 2 spaces after the "," for example: 10.01. I know how you can do it if the variable is calculated with other variables.

public class Problem {

    double h;
    double p;
    double k;
	double m;
	double t;

	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		
        System.out.println("Palun sisestage läbitud vahemaa kilomeetrites:  ");
        p = scan.nextDouble();
		
        System.out.println("Palun sisestage kasutatud kütuse hind:  ");
        h = scan.nextDouble();
		
        System.out.println("Palun sisestage tarbitud kütuse kogus liitrites:  ");
        k = scan.nextDouble();
		
		double t;
		t = k / (p * 100);
		
		public static ; double t = 2.6789;
		System.out.printf("%.2f", t);
		
		double m;
		m = k * h;
		
		public static ; double m = 2.6789;
		System.out.printf("%.2f", m);
		
        System.out.printf(" You have driven " + p + " kilometers and used " +
                k + " liters of fuel. Your car used " + t + " liters of fuel per 100 kilometers. Cost of the drive was " + m + " euros. ");  
    }
	
}

[JosAH]

In the first line: 'problem?' is not a valid class name (it isn't even a valid identifier name); make that 'Problem'.

kind regards,

Jos

[Tolls]

If you want us to comment on your code it really ought to be posted here.
Many people (including me) will not download stuff.

[Reviloest]

I thought that, but i do not know how can i poste code formats. Tried seaching, nothing.

[Tolls]

[code]
Your code goes here
[/code]

:)

[jim829]

You have a number of "problems" here. You won't be able to access your unqualified instance variables (h,p, etc) from a static context like main. The dangling public static; statement is also causing problems. There may be others since I didn't even try to compile this.

And do what Tolls suggested in post #5.

Regards,
Jim

[JosAH]

Lines #25 and #31 don't make any sense at all; you need to fix them. Also, non static member variables need an object or they won't exist.

kind regards,

Jos

[Reviloest]

Lines #25 and #31 don't make any sense at all; you need to fix them. Also, non static member variables need an object or they won't exist.

kind regards,

Jos

Thanks! Got it working. Still havent figured out the 2nd question.

[Norm]

Still havent figured out the 2nd question.

Can you post the program's output to show the problem?
Add some comments saying what is wrong with it and show what the output should look like.

[JosAH]

Thanks! Got it working. Still havent figured out the 2nd question.

Why don't you use the printf( ... ) method (as you already did in your original incorrect code)?

kind regards,

Jos

[Reviloest]

Why don't you use the printf( ... ) method (as you already did in your original incorrect code)?

kind regards,

Jos

I did but where does the printf() go?

[jim829]

I did but where does the printf() go?

I am using great restraint here but I simply have to ask how you can't know the answer to that? Also, did you remove the "public static;" statement?
And I presume the second declaration of 't' is also an error since a) it will cause a compiler error, and b) you already calculated 't'.

Once you think your code is correct, you should repost it (don't edit the old code). Otherwise, we can only guess what you have done.

Regards,
Jim

[Reviloest]

import java.util.Scanner;
 
public class Arvutamine1 {
 
  public static void main(String[] args) {
 
    Scanner scan = new Scanner(System.in);
 
    System.out.println("Please enter the distance:  ");
    double p = scan.nextDouble(); //here is the problem- how do i make
    the value of this variable shown with 2 decimal places? Same with     
    others.
 
    System.out.println("Please enter the price of fuel:  ");
    double h = scan.nextDouble();
 
    System.out.println("Please enter the amount of consumed fuel:  ");
    double k = scan.nextDouble();
 
    double t = k / ( p / 100);
 
    System.out.printf("%.2f", t);
 
    double m = k * h;
 
    System.out.printf("%.2f", m);
 
    System.out.printf(" You have driven " + p + " kilometers and used " +
                k + " liters of fuel. Your car used " + t + " liters of fuel per 100 kilometers ");
  }
 
}

New code.

Edit: still cant get the code format working.

[JosAH]

@OP: didn't you read my edit comments both in your OP and in your last post? Programmers can never be sloppy ...

kind regards,

Jos

[jim829]

You're not using your second printf() correctly. It is basically just a print().

Regards,
Jim

[Tolls]

Compare this printf usage from your code:

System.out.printf("%.2f", m);

with this printf on the following line:

System.out.printf(" You have driven " + p + " kilometers and used " +
                k + " liters of fuel. Your car used " + t + " liters of fuel per 100 kilometers ");

The latter has no formatting in there t all (that's what the %.2f stuff in the first one is all about).

[Reviloest]

@OP: didn't you read my edit comments both in your OP and in your last post? Programmers can never be sloppy ...

kind regards,

Jos

yes i read them both. Tried how you explained, didint work, thats why.

[Reviloest]

Compare this printf usage from your code:

System.out.printf("%.2f", m);

with this printf on the following line:

System.out.printf(" You have driven " + p + " kilometers and used " +
                k + " liters of fuel. Your car used " + t + " liters of fuel per 100 kilometers ");

The latter has no formatting in there t all (that's what the %.2f stuff in the first one is all about).

Does that mean the latter one overwrites the first one? If so, whats the proper formating in order to achieve that?

[Norm]

latter one overwrites the first one

I don't think there is a way to overwrite text written to a Windows console. I don't know about Linux.

[jim829]

You need to read the Java API on the Formatter class (Formattable (Java Platform SE 8 )). This is what printf uses to do its magic. There are plenty of examples in the API.

Regards,
Jim