Program Calculator Menggunakan Visual C Sharp

Design form seperti berikut ini :

 

Berikut merupakan program calculator menggunakan Visual C Sharp.

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static Double a = 0;
        public static Double b = 0;

        public static Double c = 0;
        public static string bil = "0";
        public static string operatornya = "";
        public Double hasil(string operatornya)
        {
            switch (operatornya)
            {
                case " bagi": c = a / b;
                    break;
                case "kali": c = a * b;
                    break;
                case "tambah": c = a + b;
                    break;
                default: c = a - b;
                    break;
            }
            return c;
        }

        private void btn1_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "1";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "1";
                this.WIN.Text = bil;
            }
        }

        private void btn2_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "2";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "2";
                this.WIN.Text = bil;
            }
        }

        private void btn3_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "3";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "3";
                this.WIN.Text = bil;
            }
        }

        private void btn4_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "4";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "4";
                this.WIN.Text = bil;
            }
        }

        private void btn5_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "5";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "5";
                this.WIN.Text = bil;
            }
        }

        private void btn6_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "6";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "6";
                this.WIN.Text = bil;
            }
        }

        private void btn7_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "7";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "7";
                this.WIN.Text = bil;
            } 
        }

        private void btn8_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "8";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "8";
                this.WIN.Text = bil;
            }
        }

        private void btn9_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "9";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "9";
                this.WIN.Text = bil;
            }
        }

        private void btn0_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + "0";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "0";
                this.WIN.Text = bil;
            }
        }

        private void btnbagi_Click(object sender, EventArgs e)
        {
            if (a == 0)
            {
                a = Double.Parse(bil);
                operatornya = "bagi";
                bil = null;
                this.WIN.Text = "0";
            }
            else
            {
                b = Double.Parse(bil);
                a = hasil("bagi");
                operatornya = "bagi";
                bil = null;
                this.WIN.Text = "0";
            }

        }

        private void btnkali_Click(object sender, EventArgs e)
        {
            if (a == 0)
            {
                a = Double.Parse(bil);
                operatornya = "kali";
                bil = null;
                this.WIN.Text = "0";
            }
            else
            {
                    b = Double.Parse(bil);
                a = hasil("kali");
                operatornya = "kali";
                bil = null;
                this.WIN.Text = "0";
            }
        }

        private void btnmin_Click(object sender, EventArgs e)
        {
            if (a == 0)
            {
                a = Double.Parse(bil);
                operatornya = "kurang";
                bil = null;
                this.WIN.Text = "0";
            }
            else
            {
                b = Double.Parse(bil);
                a = hasil("kurang");
                operatornya = "kurang";
                bil = null;
                this.WIN.Text = "0";
            }
        }

        private void btnhasil_Click(object sender, EventArgs e)
        {
            b = Double.Parse(bil);
            this.WIN.Text = hasil(operatornya).ToString();
            bil = "0";
            a = 0;
            b = 0;
        }

        private void btnc_Click(object sender, EventArgs e)
        {
            a = 0;
            b = 0;
            bil = "0";
            this.WIN.Text = "0";

        }

        private void btnback_Click(object sender, EventArgs e)
        {
            int jml = bil.Length;
            bil = bil.Substring(0, jml - 1);
            this.WIN.Text= bil;
        }

        private void btnplus_Click(object sender, EventArgs e)
        {
            double bilMinus= Double.Parse(bil) * -1;
            bil = bilMinus.ToString();
            this.WIN.Text = bil;

        }

        private void btntitik_Click(object sender, EventArgs e)
        {
            if (bil != "0")
            {
                bil = bil + ",";
                this.WIN.Text = bil;
            }
            else
            {
                bil = "0";
                this.WIN.Text = bil;
            }
        }

        private void btnTambah_Click_1(object sender, EventArgs e)
        {
            if (a == 0)
            {
                a = Double.Parse(bil);
                operatornya = "tambah";
                bil = null;
                this.WIN.Text = "0";
            }
            else
            {
                b = Double.Parse(bil);
                a = hasil("tambah");
                operatornya = "tambah";
                bil = null;
                this.WIN.Text = "0";
            }
        }
    }
}

Sumber : Mesran.net