Thread: Code problems! HELP :)

Sup fellas!

I'm having some problems with my code.. Can you please help me out! Thanks

Here is the code:

import java.util.Scanner;
public class Paint
{
    public static void main(String[] args)
    {
        final int COVERAGE = 350; 
        //paint covers 350 sq ft/gal
 
        //declare integers length, width, and height;
        String length;
        String width;
        String height;
 
        //declare double totalSqFt;
        Double totalSqFt;
        //declare double paintNeeded;
        Double paintNeeded;
 
        //declare and initialize Scanner object          
        //Prompt for and read in the length of the room
        Scanner len;
        System.out.println("Enter the length of the room: ");
        length = len.next();
 
        //Prompt for and read in the width of the room
        Scanner wid;
        System.out.println("Enter the width of the room: ");
        width = wid.next();
 
        //Prompt for and read in the height of the room
        Scanner hei;        
        System.out.println("Enter the hight of the room: ");
        height = hei.next();
 
        //Compute the total square feet to be painted--think
        //about the dimensions of each wall
 
        totalSqFt = (len * hei) + (wid * hei);
 
        //Compute the amount of paint needed
 
        paintNeeded = totalSqFt - 350;
 
        //Print the length, width, and height of the room and the
        //number of gallons of paint needed.
 
        System.out.println("The length is "+len);
        System.out.println("The width is "+wid);
        System.out.println("The height is "+hei);
        System.out.println("The number of gallons of paint needed is: "+paintNeeded);
    }
}

The comments in the code are telling you what are you supposed to do..

Originally Posted by adi2609

I'm having some problems with my code.. Can you please help me out! Thanks
....
The comments in the code are telling you what are you supposed to do..

First and foremost, I think that you'll want to go into detail on just what problems you may be having. The better and more informative your question, usually the better and more informative our answers can be. Also consider editing your original post and surrounding your posted code with [code] [/code] tags so that it retains its formatting and is readable.

Mmm actually I was looking how to put the code to look better but I couldn't find it. Sorry I'm new here .. I guess now it looks better

So the thing is when I go to Compile the code in the line where is my equation totalSqFt = (len * hei) + (wid * hei); it says me that the bold thing has bad operand types for binary operator '*'..

What type of variable is hei?

--- Update ---

Note: I know the answer to this question, but I want YOU to see why this is important.

Seems that len, wid, hei all point to null. You haven't created your scanners. And than you try to perform mathematical operations on that scanners or print them out, which is incorrect... You have height, width and length variables for that purposes. Actually, you can't perform mathematical operations on objects such as Scanner (with certain exceptions like Integer, String).

import java.util.Scanner;
public class Paint
{
    public static void main(String[] args)
    {
        final int COVERAGE = 350; 
 
        Scanner len = new Scanner(System.in);
        System.out.println("Enter the length of the room: ");
        int length = len.nextInt();         
 
        Scanner wid = new Scanner(System.in);
        System.out.println("Enter the width of the room: ");
        int width = wid.nextInt();        
 
        Scanner hei = new Scanner(System.in);        
        System.out.println("Enter the height of the room: ");
        int height = hei.nextInt();
 
        //Compute the total square feet to be painted--think
        //about the dimensions of each wall
 
        Double totalSqFt = (length*height)+(width*height);
 
        //Compute the amount of paint needed
 
        Double paintNeeded = totalSqFt - 350;
 
        //Print the length, width, and height of the room and the
        //number of gallons of paint needed.
 
        System.out.println("The length is "+length);
        System.out.println("The width is "+width);
        System.out.println("The height is "+height);
        System.out.println("The number of gallons of paint needed is: "+paintNeeded);
    }
}

Alright, my code looks like this now.. I guess that I did good job with scanners but I don't really understand what am I supposed to do with the equation.. now the error is: Double totalSqFt = (length*height)+(width*height); and it says "incompatible types"... Someone help, please

"There was an expression of a certain type required here.
You provided an expression of a different type that is not
compatible. (E.g. you wrote a String an int was expected)."

I'm using BlueJ IDE and when I click on Compile it says me incompatible types.. So, now I'm lost

If you're getting a new error and need help, you should print the full error message here as well as show the lines of text involved. At this point we shouldn't have to be reminding you to do this.

Originally Posted by adi2609

I'm using BlueJ IDE and when I click on Compile it says me incompatible types.. So, now I'm lost

Norm I use BlueJ as well for my degree and the error it gives you is 'incompatible types', then highlight in red what code its referring to.
i.e double miles = feet * foot;