Contoh Codingan kalkulator C#

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 kalkulator

{

    public partial class kalkulator : Form

    {

        string operand1 = string.Empty;

        string operand2 = string.Empty;

        string result;

        char operation;

        int a = 0;

        public kalkulator()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

        private void button1_Click(object sender, EventArgs e) //angka 1

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "1";

        }

        private void button2_Click(object sender, EventArgs e) // angka 2

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "2";

        }

        private void button3_Click(object sender, EventArgs e) //angka 3

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "3";

        }

        private void button4_Click(object sender, EventArgs e)

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "4";

        }

        private void button5_Click(object sender, EventArgs e)

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "5";

        }

        private void button6_Click(object sender, EventArgs e)

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "6";

        }

        private void button7_Click(object sender, EventArgs e)

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "7";

        }

        private void button8_Click(object sender, EventArgs e)

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "8";

        }

        private void button9_Click(object sender, EventArgs e)

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "9";

        }

        private void button10_Click(object sender, EventArgs e)

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += "0";

        }

        private void button15_Click(object sender, EventArgs e) // .

        {

            if (a <= 0)

            {

                textBox1.Text = string.Empty;

            }

            a++;

            textBox1.Text += ".";

        }

        private void button13_Click(object sender, EventArgs e) //  +

        {

            operand1 = textBox1.Text;

            operation = '+';

            textBox1.Text = string.Empty;

        }

        private void button11_Click(object sender, EventArgs e) // *

        {

            operand1 = textBox1.Text;

            operation = '*';

            textBox1.Text = string.Empty;

        }

        private void button12_Click(object sender, EventArgs e) // (“/”)

        {

            operand1 = textBox1.Text;

            operation = '/';

            textBox1.Text = string.Empty;

        }

        private void button14_Click(object sender, EventArgs e) // -

        {

            operand1 = textBox1.Text;

            operation = '-';

            textBox1.Text = string.Empty;

        }

        private void button16_Click(object sender, EventArgs e) // =

        {

            operand2 = textBox1.Text;

            double opr1, opr2;

            double.TryParse(operand1, out opr1);

            double.TryParse(operand2, out opr2);

            switch (operation)

            {

                case '+':

                    a = 0;

                    result = (opr1 + opr2).ToString();

                    textBox1.Text = result.ToString();

                    break;

                case '-':

                    a = 0;

                    result = (opr1 - opr2).ToString();

                    textBox1.Text = result.ToString();

                    break;

                case '*':

                    a = 0;

                    result = (opr1 * opr2).ToString();

                    textBox1.Text = result.ToString();

                    break;

                case '/':

                    if (opr2 != 0)

                    {

                        a = 0;

                        result = (opr1 / opr2).ToString();

                        textBox1.Text = result.ToString();

                    }

                    else

                    {

                        a = 0;

                        textBox1.Text = "tidak bisa di bagi 0 !!";

                    }

                    break;

            }

        }

        private void button17_Click(object sender, EventArgs e) // C

        {

            textBox1.Text = "0";

        }

    }

}

Gambar Kalkulator