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Help with switch

 
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Help with switch
tygerberg
19 Aug, 2007 - 12:59 PM
Post #1

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Hi
I'm pretty bad at using switch, this program is an example, could someone please help me.

CODE
import javax.swing.JOptionPane;
public static void main(String[] args) {
        
        int x1,x2,ans;
        char choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit");
        
        switch(choice)
        {
        case ('A'):
        case ('a'):
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
                   ans = x1 + x2;
                   JOptionPane.showMessageDialog(null,"The answer is: "+ans);
                   break;
        case ('S'):
        case ('s'):
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
                   ans = x1 - x2;
                   JOptionPane.showMessageDialog(null,"The answer is: "+ans);
                   break;
        case ('D'):
        case ('d'):
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
                   ans = x1 / x2;
                   JOptionPane.showMessageDialog(null,"The answer is: "+ans);
                   break;  
        case ('E'):
        case ('e'):
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
                   ans = x1 * x2;
                   JOptionPane.showMessageDialog(null,"The answer is: "+ans);
                   break;
        case ('X'):
        case ('x'):
                   System.exit(0);
        default:
                   JOptionPane.showMessageDialog(null,"OH");
       }
       System.exit(0);      
    }
    
}
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Amadeus
RE: Help With Switch
19 Aug, 2007 - 01:03 PM
Post #2

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Absolutely...can you specify the problem? Are you getting error messages? What are they? Or are you seeing undesired behaviour?
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tygerberg
RE: Help With Switch
19 Aug, 2007 - 01:06 PM
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Well using netbeans I get the following:

CODE
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:14: incompatible types
found   : java.lang.String
required: int
        int choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:20: incompatible types
found   : java.lang.String
required: int
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:21: incompatible types
found   : java.lang.String
required: int
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:27: incompatible types
found   : java.lang.String
required: int
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:28: incompatible types
found   : java.lang.String
required: int
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:34: incompatible types
found   : java.lang.String
required: int
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:35: incompatible types
found   : java.lang.String
required: int
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:41: incompatible types
found   : java.lang.String
required: int
                   x1 = JOptionPane.showInputDialog("Enter first Number: ");
C:\Documents and Settings\Gareth\My Documents\My Games\Switch\src\switchpkg\Main.java:42: incompatible types
found   : java.lang.String
required: int
                   x2 = JOptionPane.showInputDialog("Enter second Number: ");
9 errors
BUILD FAILED (total time: 0 seconds)
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alpha02
RE: Help With Switch
19 Aug, 2007 - 01:27 PM
Post #4

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The following code is wrong:

CODE
int x1 = JOptionPane.showInputDialog(...);


The showInputDialog method returns a String and not a int. The showConfirmDialog returns an int. For more info, see:

http://www.dreamincode.net/forums/showtopic22739.htm

Also, I doubt the line:

CODE
char choice = JOptionPane.showInputDialog(...);


will always give the desired result. You'd better use:

CODE
char choice = JOptionPane.showInputDialog(...).toLowerCase().toCharArray()[0];


In the switch, put only:

case 'a':
case 's':
case 'm':
case 'd':

instead of having also uppercase statements, because we converted the string to lowercase in the line I told you to use smile.gif Any questions then just reply!

This post has been edited by alpha02: 19 Aug, 2007 - 01:31 PM
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tygerberg
RE: Help With Switch
20 Aug, 2007 - 08:04 AM
Post #5

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Thanks a lot it really helped me learn the switch. Here's my final app.

CODE
import javax.swing.JOptionPane;
public class Switch
{
    public static void main (String[] args)
    {
       String x1, x2;
    int ans, x11, x22;
        
    char choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit").toLowerCase().toCharArray()[0];
    
    do {
    switch(choice)
    {
    case ('a'):
           x1 = JOptionPane.showInputDialog("Enter first Number: ");
           x2 = JOptionPane.showInputDialog("Enter second Number: ");
           x11 = Integer.parseInt(x1);
           x22 = Integer.parseInt(x2);
           ans = x11 + x22;
           JOptionPane.showMessageDialog(null,"The answer is: "+ans);
           choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit").toLowerCase().toCharArray()[0];
           break;
    case ('s'):
           x1 = JOptionPane.showInputDialog("Enter first Number: ");
           x2 = JOptionPane.showInputDialog("Enter second Number: ");
           x11 = Integer.parseInt(x1);
           x22 = Integer.parseInt(x2);
           ans = x11 - x22;
           JOptionPane.showMessageDialog(null,"The answer is: "+ans);
           choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit").toLowerCase().toCharArray()[0];
           break;
    case ('d'):
           x1 = JOptionPane.showInputDialog("Enter first Number: ");
           x2 = JOptionPane.showInputDialog("Enter second Number: ");
           x11 = Integer.parseInt(x1);
           x22 = Integer.parseInt(x2);
           ans = x11 / x22;
           JOptionPane.showMessageDialog(null,"The answer is: "+ans);
           choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit").toLowerCase().toCharArray()[0];
           break;  
    case ('e'):
           x1 = JOptionPane.showInputDialog("Enter first Number: ");
           x2 = JOptionPane.showInputDialog("Enter second Number: ");
           x11 = Integer.parseInt(x1);
           x22 = Integer.parseInt(x2);
           ans = x11 * x22;
           JOptionPane.showMessageDialog(null,"The answer is: "+ans);
           choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit").toLowerCase().toCharArray()[0];
           break;
    case ('x'):
           System.exit(0);
    default:
           JOptionPane.showMessageDialog(null,"That option was not available. Try again.");
           choice = JOptionPane.showInputDialog("Menu\n---\nA. Add\nS. Subtract\nD. Divide\nE. Multiply\nX. Exit").toLowerCase().toCharArray()[0];
          
                      
          
       }
           } while (choice != 'n');
    }
        
} // main method
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alpha02
RE: Help With Switch
20 Aug, 2007 - 08:50 AM
Post #6

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You're welcome wink2.gif
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