Question

// Arithmetic2.java - This program performs arithmetic, ( +. -, *. /, % ) on two numbers
// Input:  Interactive.
// Output:  Result of arithmetic operation

import javax.swing.*;

public class Arithmetic2
{
        public static void main(String args[]) 
        {
                double numberOne, numberTwo;                    
                String numberOneString, numberTwoString;
                String operation;
                double result;  
                                                
                numberOneString = JOptionPane.showInputDialog("Enter the first number: ");
                numberOne = Double.parseDouble(numberOneString); 
                numberTwoString = JOptionPane.showInputDialog("Enter the second number: ");
                numberTwo = Double.parseDouble(numberTwoString); 
                operation = JOptionPane.showInputDialog("Enter an operator (+.-.*,/,%): ");
                
                // Call performOperation method here            
                

                System.out.format("%.2f",numberOne);
                System.out.print(" " + operation + " ");
                System.out.format("%.2f", numberTwo);
                System.out.print(" = ");
                System.out.format("%.2f", result);
        
                System.exit(0);

        } // End of main() method.
        
        
        // Write performOperation method here.
        

} // End of Arithmetic2 class.

Answer 1

// Arithmetic2.java - This program performs arithmetic, ( +. -, *. /, % ) on two numbers
// Input: Interactive.
// Output: Result of arithmetic operation

import javax.swing.*;

public class Arithmetic2 {
   public static void main(String args[]) {
       double numberOne, numberTwo;
       String numberOneString, numberTwoString;
       String operation;
       double result = 0.0;

       numberOneString = JOptionPane
               .showInputDialog("Enter the first number: ");
       numberOne = Double.parseDouble(numberOneString);
       numberTwoString = JOptionPane
               .showInputDialog("Enter the second number: ");
       numberTwo = Double.parseDouble(numberTwoString);
       operation = JOptionPane
               .showInputDialog("Enter an operator (+.-.*,/,%): ");

       // Call performOperation method here
       result = performOperation(numberOne, numberTwo, operation);
       System.out.format("%.2f", numberOne);
       System.out.print(" " + operation + " ");
       System.out.format("%.2f", numberTwo);
       System.out.print(" = ");
       System.out.format("%.2f", result);

       System.exit(0);

   } // End of main() method.

   // Write performOperation method here.
   public static double performOperation(double numberOne, double numberTwo,
           String operation) {

       double result = 0.0;

       char op = operation.charAt(0);
       switch (op) {
       case '+':
           result = numberOne + numberTwo;
           break;
       case '-':
           result = numberOne - numberTwo;
           break;
       case '*':
           result = numberOne * numberTwo;
           break;
       case '/':
           result = numberOne / numberTwo;
           break;
       case '%':
           result = numberOne % numberTwo;
           break;

       default:
           break;
       }

       return result;

   }
} // End of Arithmetic2 class.

OUTPUT: