I have written a java calculator program that doesn\'t do calculations and would

Question

I have written a java calculator program that doesn't do calculations and would like to have it work like a real calculator. Here is the code:

package calculator;

import javax.swing.*;
import java.awt.*;

public class Calc extends JFrame {
  
   public Calc()
   {

       super.setTitle("Calculator");

       new Font("SansSerif", Font.BOLD, 16);
       JTextField jtext = new JTextField(" 0 ");
       jtext.setSize(250,25);
       jtext.setHorizontalAlignment(JTextField.RIGHT);
      
       JPanel textPanel = new JPanel(new BorderLayout());
       textPanel.add(jtext, BorderLayout.NORTH);
       JPanel buttonsPanel = new JPanel(new GridLayout(4,4,5,5));
       buttonsPanel.setBackground(Color. GRAY);
      
       JButton JButton("1");
       JButton two = new JButton("2");
       JButton three = new JButton("3");
       JButton four = new JButton("4");
       JButton five = new JButton("5");;
       JButton six = new JButton("6");
       JButton seven = new JButton("7");
       JButton eight = new JButton("8");
       JButton nine = new JButton("9");
       JButton zero = new JButton("0");
       JButton decimal = new JButton(".");
       JButton equal = new JButton("=");
       JButton multiply = new JButton("*");
       JButton divide = new JButton("/");
       JButton minus = new JButton("-");
       JButton add = new JButton("+");

       buttonsPanel.add(seven);
       buttonsPanel.add(eight);
       buttonsPanel.add(nine);
       buttonsPanel.add(divide);
       buttonsPanel.add(four);
       buttonsPanel.add(five);
       buttonsPanel.add(six);
       buttonsPanel.add(multiply);
       buttonsPanel.add(one);
       buttonsPanel.add(two);
       buttonsPanel.add(three);
       buttonsPanel.add(minus);
       buttonsPanel.add(decimal);
       buttonsPanel.add(zero);
       buttonsPanel.add(equal);
       buttonsPanel.add(add);
      

      
       seven. setBackground(Color.BLACK);
       seven.setForeground(Color.WHITE);
       eight.setBackground(Color.WHITE);
       eight.setForeground(Color.BLACK);
       nine.setBackground(Color.BLACK);
       nine.setForeground(Color.WHITE);
       divide.setBackground(Color.WHITE);
       divide.setForeground(Color.BLACK);
       four.setBackground(Color.WHITE);
       four.setForeground(Color.BLACK);
       five.setBackground(Color.BLACK);
       five.setForeground(Color.WHITE);
       six.setBackground(Color.WHITE);
       six.setForeground(Color.BLACK);
       multiply.setBackground(Color.BLACK);
       multiply.setForeground(Color.WHITE);
       one.setBackground(Color.BLACK);
       one.setForeground(Color.WHITE);
       two.setBackground(Color.WHITE);
       two.setForeground(Color.BLACK);
       three.setBackground(Color.BLACK);
       three.setForeground(Color.WHITE);
       minus.setBackground(Color.WHITE);
       minus.setForeground(Color.BLACK);
       decimal.setBackground(Color.WHITE);
       decimal.setForeground(Color.BLACK);
       zero.setBackground(Color.BLACK);
       zero.setForeground(Color.WHITE);
       equal.setBackground(Color.WHITE);
       equal.setForeground(Color.BLACK);
       add.setBackground(Color.BLACK);
       add.setForeground(Color.WHITE);
      
       JPanel mainPanel = new JPanel(new BorderLayout());

       mainPanel.add(textPanel, BorderLayout.NORTH);
       mainPanel.add(buttonsPanel, BorderLayout.CENTER);
       add(mainPanel, BorderLayout.CENTER);
       }

   public static void main(String[] args) {

   Calc frame = new Calc();
   frame.setSize(250, 250);
   frame.setLocationRelativeTo(null);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setResizable(false);
   frame.setVisible(true);

   }
   }

Please don't change the GUI, just add the math and number portion to it. Full points will be awarded to a working code only!

Explanation / Answer

import java.util.Scanner; public class Calculator { public static void main(String[] args) { Scanner input = new Scanner(System.in); Maths Maths = new Maths(); double answer = 0; double inputA, inputB; char operator; boolean done = false; while (done == false) { System.out.print("Please enter your sum: "); inputA = input.nextDouble(); operator = input.next().charAt(0); inputB = input.nextDouble(); switch (operator) { case '+': answer = Maths.add(inputA, inputB); break; case '-': answer = Maths.subtract(inputA, inputB); break; case '*': answer = Maths.multiply(inputA, inputB); break; case '/': answer = Maths.divide(inputA, inputB); break; case '^': answer = Maths.power(inputA, inputB); break; } System.out.println(answer); } input.close(); } } public class Maths { double add(double a, double b) { double answer = a+b; return answer; } double subtract(double a, double b) { double answer = a-b; return answer; } double multiply(double a, double b) { double answer = a*b; return answer; } double divide(double a, double b) { double answer = a/b; return answer; } double power(double a, double b){ double answer =a; for (int x=2; x

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