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Thread: JAVA Calculator Problem

  1. #1
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    Default JAVA Calculator Problem

    Please Help me solve my problem in using switch and also the answer would be output required decimal places. its for my final exam. thanks a lot.

    import java.io.*;
    import java.util.*;
    import javax.swing.JOptionPane;
     
    public class exercise1
    {
     
    	public static void main(String args[]){
    		String input = JOptionPane.showInputDialog("Selection from the choices below:\n\n 1. Addition\n 2. Subtraction\n 3. Multiplication\n 4. Division\n 5. Modulo\n\n Your choice?");
     
     
    	JOptionPane.showInputDialog("\nEnter first number: ");
    	int x = Integer.parseInt(x);
    	JOptionPane.showInputDialog("Enter second number: ");
    	int y = Integer.parseInt(y);
     
     
    	int choice = Integer.parseInt(input);
    	if((choice<=5) && (choice>0))
    	{
     
    	switch (choice)
    	{
     
    	case 1: //addition 1 decimal place
    		JOptionPane.showMessageDialog(null, x + " plus " +  y + " = " + (x + y);
    	break;
     
    	case 2: //subtraction no decimal place
    		JOptionPane.showMessageDialog(x + " minus " + y + " = " + (x - y) );
    	break;
     
    	case 3: //multiplication 3 decimal place
    		JOptionPane.showMessageDialog(x + " times " + y + " = " + (x * y) );
    	break;
     
    	case 4: //division 4 decimal place
    		JOptionPane.showMessageDialog(x + " divided by " + y + " = " + (x / y) );
    	break;
     
    	case 5: //modulo
    		JOptionPane.showMessageDialog(x + " modulo " + y + " = " + (x % y) );
    	//break;
    	}
     
    	}
    	else
    	{
    	System.out.println("Please enter a 1, 2, 3, 4 or 5.");
    	}
    }
    }


  2. #2
    Super Moderator jps's Avatar
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    Default Re: JAVA Calculator Problem

    Quote Originally Posted by lordrey View Post
    Please Help me solve my problem in using switch
    What is your problem in using switch?
    Does it compile? Is there an error?

    If you need help, ask a question besides the implied "give me a working solution"

  3. #3
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    Default Re: JAVA Calculator Problem

    Hello.
    Thats simple.
    If you want floating or double values then change the type of the variables x and y respectively. You will have to use the parseXxx() of the corresponding wrapper class.
    In simpler words the way you are doing for integers the same way you do for floats/doubles.

    Thanks,
    Syed.

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