Thread: Simple java program to calculate wall covering of a room

hi there,

i have been doin java for a few months now. and i have been trying to solve small and simple programs first, so that i understand java right from the beggining.
im currently solving a very simple program which is calculating the wall cover estimate of a room. i would appretiate it alot if some could help me with this simple program as i have been trying to solve the errors with the calculations and the whole structure of the program.

this is the work which i have done so far.
thanks alot

// calculating area of wall covering of a room
 
import javax.swing.JOptionPane;
 
public class Room
{
// First Method, to find Area of room to be covered
    public static void areaOfRoom(double lenght, double height, double width)
    {
        double area = 2 * (lenght * height) + 2 * (width * height);
 
 
        if (lenght<0)
        JOptionPane.showMessageDialog(null, "Lenght Can not be negative");
        if (height<0)
        JOptionPane.showMessageDialog(null, "Height Can not be negative");
        if (width<0)
                JOptionPane.showMessageDialog(null, "Width Can not be negative");
                if (lenght>0)
        if (height>0)
                if (Width>0)
        JOptionPane.showMessageDialog(null, "The Area of Rectangle is " + area);
     }
 
// Main Method to input numbers from the user
     public static void main(String[]args)
     {
         String input = JOptionPane.showInputDialog("Please Type in 1 to find the Area of Room");
         int number = Integer.parseInt(input);
         int count=0;
         double l,h + w,h;
 
         // This Section runs the areaOfRectangle Method
         if (number==1)
         {
         input = JOptionPane.showInputDialog("Please Type in the Lenght of the Room");
         l = Integer.parseInt(input);
         input = JOptionPane.showInputDialog("Please Type in the Height of the Room");
         h = Integer.parseInt(input);
         input = JOptionPane.showInputDialog("Please Type in the Width of the Room");
                 W = Integer.parseInt(input);
                 areaOfRectangle 2 * (l, h) + 2 * (W, h);
 
                 else if (number<0) // Terminates the program
         {
         }
      }
}

thanks alot for helping me with my problems with the program.
when compiling the program i come up with errors and i have been trying figure out what the problem. im using textpad to write the code in.
i have tried the way suggested but am finding it hard to sort it out.
thanks alot again.




// calculating area of wall covering of a room

import javax.swing.JOptionPane;



// First Method, to find Area of room to be covered
public static void areaOfRoom(double length, double height, double width)
{
double area = 2*height*length+2*width*length+2*height*width;
{
if (lenght<0)
JOptionPane.showMessageDialog(null, "Lenght Can not be negative");
else if (height<0)
JOptionPane.showMessageDialog(null, "Height Can not be negative");
else if (width<0)
JOptionPane.showMessageDialog(null, "Width Can not be negative");
else
JOptionPane.showMessageDialog(null, "The Area of Rectangle is " + area);
}
}


public static void main(String[]args)
{
String input = JOptionPane.showInputDialog("Please Type in 1 to find the Area of Room");
int Number = Integer.parseInt(input);
int count=0;
double l, w, h;

// This Section runs the areaOfRectangle Method
int number = 0;
while (number == 1)
{
input = JOptionPane.showInputDialog("Please Type in the Lenght of the Room");
l = Integer.parseInt(input);
input = JOptionPane.showInputDialog("Please Type in the Height of the Room");
h = Integer.parseInt(input);
input = JOptionPane.showInputDialog("Please Type in the Width of the Room");
w = Integer.parseInt(input);
String input = JOptionPane.showInputDialog("Please Type in 1 to find the area of another room");
number = Integer.parseInt(input);
}

else if (number<0) // Terminates the program
{
}

}