Calculator Using .NET Windows App

In this blog, you will learn how to create a simple calculator app using C# and .NET.

Introduction

 

Here is a Windows Forms app that creates a Simple Arithmetic Calculator UI app using .NET and C#. 

 

Sample Program

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace calculator1
{
    public partial class Form1 : Form
    {
        int a=0;
        int b,c;
        string msg;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void b1_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b1.Text;
        }

        private void b2_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b2.Text;
        }

        private void b3_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b3.Text;
        }

        private void b5_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b5.Text;
        }

        private void b6_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b6.Text;
        }

        private void b7_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b7.Text;
        }

        private void b9_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b9.Text;
        }

        private void b10_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b10.Text;
        }

        private void b11_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b11.Text;
        }

        private void b13_Click(object sender, EventArgs e)
        {
            t1.Text = t1.Text + b13.Text;
        }

        private void b4_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(t1.Text);
            t1.Text = "";
            msg = "+";
        }

        private void b8_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(t1.Text);
            t1.Text = "";
            msg = "-";
        }

        private void b12_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(t1.Text);
            t1.Text = "";
            msg = "*";
        }

        private void b15_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(t1.Text);
            t1.Text = "";
            msg = "/";
        }

        private void b16_Click(object sender, EventArgs e)
        {
            t1.Text = "";
        }

        private void b14_Click(object sender, EventArgs e)
        {
            if (msg == "+")
            {
                b = Convert.ToInt32(t1.Text);
                c = a + b;
            }

            if (msg == "-")
            {
                b = Convert.ToInt32(t1.Text);
                c = a - b;
            }

            if (msg == "*")
            {
                b = Convert.ToInt32(t1.Text);
                c = a * b;
            }

            if (msg == "/")
            {
                b = Convert.ToInt32(t1.Text);
                c = a / b;
            }

            t1.Text = c.ToString();
       }

    }
}

Explanation

The UI of the Simple Arithmetic Calculator looks like the following where you can see, there is a button for numbers and operators. Just run the program, select your numbers and operators and run it.