How to Make a Calculator in C#
By FoxLearn 7/22/2024 2:13:46 AM 23.1K
How to Create a Calculator in C#
Open Visual Studio and create a new C# Windows Forms Application project.
Next, Open your form desginer, then drag and drop the necessary controls (buttons, text box) from the Visual Studio toolbox onto the form. You can design a simple calculator as shown below.
Design your calculator UI using buttons for numbers (0-9), operators (+, -, *, /), and other functionalities (like clear, equals).
Place a TextBox
control at the top to display input and results. Set its TextAlign
property to Right
for a cleaner look.
How to create a simple calculator in C# WinForms
Double-click on each button in the designer to generate the default click event handler, then implement the button click event handlers to update the TextBox
(txtResult
) based on user input as the following c# code.
// c# variables to store operands and operator double value; string coperator; bool check;
Create the PNumber method allows you to display the numeric value that you enter in the TextBox control.
//Handle number button private void PNumber(object sender, EventArgs e) { if ((coperator == "+") || (coperator == "-") || (coperator == "*") || (coperator == "/")) { if (check) { check = false; txtResult.Text = "0"; } } Button b = sender as Button; if (txtResult.Text == "0") txtResult.Text = b.Text; else txtResult.Text += b.Text; }
Create the POperator
method allows you to convert text to numeric.
//Handle operator button private void POperator(object sender, EventArgs e) { Button b = sender as Button; //Convert text to number value = double.Parse(txtResult.Text); coperator = b.Text; txtResult.Text += b.Text; check = true; }
Double-click on the Equal button to generate click event handlers. In the event handlers, write code to handle button clicks and perform calculations based on the user input.
// c# method to handle equals button private void button20_Click(object sender, EventArgs e) { try { switch (coperator) { case "+": txtResult.Text = (value + double.Parse(txtResult.Text)).ToString(); break; case "-": txtResult.Text = (value - double.Parse(txtResult.Text)).ToString(); break; case "*": txtResult.Text = (value * double.Parse(txtResult.Text)).ToString(); break; case "/": txtResult.Text = (value / double.Parse(txtResult.Text)).ToString(); break; } } catch (Exception ex) { MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error); } }
Add the button click event handler to the C button allows you to reset the result value to zero.
private void button5_Click(object sender, EventArgs e) { txtResult.Text = "0"; }
Add the button click event handler to the CE button allows you to clear memory and reset the result value to zero.
//Clear memory private void button10_Click(object sender, EventArgs e) { txtResult.Text = "0"; value = 0; }
This is only a simple calculator that helps you perform some calculations. The application built is designed to emulate the windows calculator and is done in c# .net
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