Simple Calculator on C#.net

Hii Guyzz To day am going to post a simple calculator code in c#.Net


ui of clculator

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;

using System.IO;

namespace calci

{

    public partial class Form1 : Form

    {

        int a;

        int b;

        int c;

       

        public Form1()

        {

           

            InitializeComponent();

          

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

        //clearing the output ie("c")

        private void button11_Click(object sender, EventArgs e) 

        {

            textBox1.Text = " ";

        }

       //getting the input to textbox by pressing the kyes.

        private void button1_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "1";

        }

      

        private void button2_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "2";

        }

        private void button3_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "3";

        }

        private void button4_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "4";

        }

        private void button5_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "5";

        }

        private void button6_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "6";

        }

        private void button7_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "7";

        }

        private void button8_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "8";

        }

        private void button9_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "9";

        }

        private void button10_Click(object sender, EventArgs e)

        {

            textBox1.Text = textBox1.Text + "0";

        }

       //now operators button code(i.e., +,-,*,etc)

       //here in every button we assigned a value to b according to that value the operations will be carried on.
        private void button12_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(textBox1.Text);
            textBox1.Text = "";
            b = 1;
        }


        private void button13_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(textBox1.Text);
            textBox1.Text = "";
            b = 2;
        }
       private void button14_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(textBox1.Text);
            textBox1.Text = "";
            b = 4;
        }
       
       private void button15_Click(object sender, EventArgs e)
        {
            a = Convert.ToInt32(textBox1.Text);
            textBox1.Text = "";
            b = 3;
        }
        //this is the code for "=" button .
       private void button16_Click(object sender, EventArgs e)
        {


            switch (b)
            {
                case 1:
                    {
                        c = Convert.ToInt32(textBox1.Text);
                        c = c + a;
                        textBox1.Text = Convert.ToString(c);
                        break;
                   
                    }
                case 2:
                    {
                        c = Convert.ToInt32(textBox1.Text);
                        c = a - c;
                        textBox1.Text = Convert.ToString(c);
                        break;


                    }
                case 3:
                    {
                        c = Convert.ToInt32(textBox1.Text);
                        c = a * c;
                        textBox1.Text = Convert.ToString(c);
                        break;


                    }
                case 4:
                    {
                        c = Convert.ToInt32(textBox1.Text);
                        c = a / c;
                        textBox1.Text = Convert.ToString(c);
                        break;
                    }
            }
        }
}