calculator

I am working a calculator using java swing and I want to be able to enter the numbers and operations via keyboard. I can't seem to get it working. import java.awt.*; import javax.swing.*; import java.awt.event.*; public class Calculator extends JFrame implements ActionListener { JPanel[] row = new JPanel[6]; JButton[] button = new JButton[23]; JMenuBar menubar = new JMenuBar(); JMenu file = new JMenu("File"); JMenuItem clear = new JMenuItem("Clear"); JMenuItem exit = new JMenuItem("Exit"); String[] buttonString = {"7", "8", "9", "+", "4", "5", "6", "-", "1", "2", "3", "*", ".", "/", "C", "√",

I have this calculator working, but I can't figure out how to get the value in the resultpane to the first textbox when you click the "finish" button. I'm new to Java. I've tried doing it, but I kept getting an error. import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.Font; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.NumberFormat; import javax.swing.AbstractAction; import static javax.swing.Action.NAME; import javax.swing.JButton; import

hi there i am trying to make a calculator with coding sizes,layouts etc. by myself (trying to not use NetBeans and it is not a homework). but i am facing with a problem about empty spaces. i have a TextArea and Buttons but as you can see below i cant handle this space problem. here is my code, import java.awt.BorderLayout; import java.awt.Color; import java.awt.FlowLayout; import java.awt.GridLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JSeparator; import javax.swing.JTextArea; public class calculator extends JFrame { public

I am making a calculator and pushing/saving all the numbers and operators clicked to an array and a string. I want to know which approach is the best in this case . Making a string or an array from the input OR a better approach I can't think of. I want to compute the array or string. The string is giving wrong answers and I don't have a clue on how I can compute the array. The demo calculator is below. $(document).ready(function(){ var inputArr = []; var inputStr = ''; $('span').click(function(){ $('#input').append($(this).text()); //push to inputArr inputArr.push($(this).text()); //add to

I am looking for a C++ class I can incorporate into a project I am working on. the functionality I need is evaluation of string operations to numerical form: for example "2 + 3*7" should evaluate to 23. I do realize what I am asking is a kind of an interpreter, and that there are tools to build them, by my background in CS is very poor so I would appreciate if you can point me to a ready made class . This should do exactly what you want. You can test it live at: http://www.wowpanda.net/calc It uses Reverse Polish Notation and supports: Operator precedence (5 + 5 * 5 = 30 not 50) Parens ((5 + 5

I know I can open Windows Calculator with the following code : System.Diagnostics.Process.Start("calc"); But I wanna open it in my C# Win Application, i.e : I don't want to open it in the independent window, I wanna open it in my window. How can I do it ? You cannot embed another application into your form. However, you can move the calculator window on top of your form and set your form as its parent. This might accomplish the visual effect that you're looking for. You might check into the SetParent API function. For example: System.Diagnostics.Process p = System.Diagnostics.Process.Start(