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Hướng dẫn viết ứng dụng máy tính bỏ túi đơn giản bằng C#

Admin

Admin

Well-Known Member
Staff member
Administrator
Chào các bạn, hôm nay tuoitreit.vn xin hướng dẫn các bạn viết chương trình máy tính bỏ túi đơn giản bằng C#
49813454257_5483612d2b_o.png

Đầu tiên bạn tạo project tên là Calculator và dán các code sau vào:
49813159616_f46e667c3c_o.png

Form1.cs
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 Calculator
{
    public partial class Form1 : Form
    {
        Double resultValue = 0;
        String operationPerformed = "";
        bool isOperationPerformed = false;
        public Form1()
        {
            InitializeComponent();
        }

        private void button_click(object sender, EventArgs e)
        {
            if ((textBox_Result.Text == "0") || (isOperationPerformed))
                textBox_Result.Clear();

            isOperationPerformed = false;
            Button button = (Button)sender;
            if (button.Text == ".")
            {
                if (!textBox_Result.Text.Contains("."))
                    textBox_Result.Text = textBox_Result.Text + button.Text;

            }
            else
                textBox_Result.Text = textBox_Result.Text + button.Text;


        }

        private void operator_click(object sender, EventArgs e)
        {
            Button button = (Button)sender;

            if (resultValue != 0)
            {
                button15.PerformClick();
                operationPerformed = button.Text;
                labelCurrentOperation.Text = resultValue + " " + operationPerformed;
                isOperationPerformed = true;
            }
            else
            {

                operationPerformed = button.Text;
                resultValue = Double.Parse(textBox_Result.Text);
                labelCurrentOperation.Text = resultValue + " " + operationPerformed;
                isOperationPerformed = true;
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            textBox_Result.Text = "0";
        }

        private void button5_Click(object sender, EventArgs e)
        {
            textBox_Result.Text = "0";
            resultValue = 0;
        }

        private void button15_Click(object sender, EventArgs e)
        {
            switch (operationPerformed)
            {
                case "+":
                    textBox_Result.Text = (resultValue + Double.Parse(textBox_Result.Text)).ToString();
                    break;
                case "-":
                    textBox_Result.Text = (resultValue - Double.Parse(textBox_Result.Text)).ToString();
                    break;
                case "*":
                    textBox_Result.Text = (resultValue * Double.Parse(textBox_Result.Text)).ToString();
                    break;
                case "/":
                    textBox_Result.Text = (resultValue / Double.Parse(textBox_Result.Text)).ToString();
                    break;
                default:
                    break;
            }
            resultValue = Double.Parse(textBox_Result.Text);
            labelCurrentOperation.Text = "";
        }
    }
}
//tuoitreit.vn
Form1.Designer.cs
C#: 
namespace Calculator
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.buttonOne = new System.Windows.Forms.Button();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.button4 = new System.Windows.Forms.Button();
            this.button5 = new System.Windows.Forms.Button();
            this.button6 = new System.Windows.Forms.Button();
            this.button7 = new System.Windows.Forms.Button();
            this.button8 = new System.Windows.Forms.Button();
            this.button9 = new System.Windows.Forms.Button();
            this.button11 = new System.Windows.Forms.Button();
            this.button12 = new System.Windows.Forms.Button();
            this.button13 = new System.Windows.Forms.Button();
            this.button14 = new System.Windows.Forms.Button();
            this.button15 = new System.Windows.Forms.Button();
            this.button16 = new System.Windows.Forms.Button();
            this.button17 = new System.Windows.Forms.Button();
            this.button19 = new System.Windows.Forms.Button();
            this.textBox_Result = new System.Windows.Forms.TextBox();
            this.labelCurrentOperation = new System.Windows.Forms.Label();
            this.SuspendLayout();
            //
            // buttonOne
            //
            this.buttonOne.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.buttonOne.Location = new System.Drawing.Point(22, 73);
            this.buttonOne.Name = "buttonOne";
            this.buttonOne.Size = new System.Drawing.Size(45, 45);
            this.buttonOne.TabIndex = 0;
            this.buttonOne.Text = "7";
            this.buttonOne.UseVisualStyleBackColor = true;
            this.buttonOne.Click += new System.EventHandler(this.button_click);
            //
            // button1
            //
            this.button1.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button1.Location = new System.Drawing.Point(73, 73);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(45, 45);
            this.button1.TabIndex = 1;
            this.button1.Text = "8";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button_click);
            //
            // button2
            //
            this.button2.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button2.Location = new System.Drawing.Point(124, 73);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(45, 45);
            this.button2.TabIndex = 2;
            this.button2.Text = "9";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button_click);
            //
            // button3
            //
            this.button3.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button3.Location = new System.Drawing.Point(175, 73);
            this.button3.Name = "button3";
            this.button3.Size = new System.Drawing.Size(45, 45);
            this.button3.TabIndex = 3;
            this.button3.Text = "/";
            this.button3.UseVisualStyleBackColor = true;
            this.button3.Click += new System.EventHandler(this.operator_click);
            //
            // button4
            //
            this.button4.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button4.Location = new System.Drawing.Point(226, 73);
            this.button4.Name = "button4";
            this.button4.Size = new System.Drawing.Size(53, 45);
            this.button4.TabIndex = 4;
            this.button4.Text = "CE";
            this.button4.UseVisualStyleBackColor = true;
            this.button4.Click += new System.EventHandler(this.button4_Click);
            //
            // button5
            //
            this.button5.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button5.Location = new System.Drawing.Point(226, 124);
            this.button5.Name = "button5";
            this.button5.Size = new System.Drawing.Size(53, 45);
            this.button5.TabIndex = 9;
            this.button5.Text = "C";
            this.button5.UseVisualStyleBackColor = true;
            this.button5.Click += new System.EventHandler(this.button5_Click);
            //
            // button6
            //
            this.button6.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button6.Location = new System.Drawing.Point(175, 124);
            this.button6.Name = "button6";
            this.button6.Size = new System.Drawing.Size(45, 45);
            this.button6.TabIndex = 8;
            this.button6.Text = "*";
            this.button6.UseVisualStyleBackColor = true;
            this.button6.Click += new System.EventHandler(this.operator_click);
            //
            // button7
            //
            this.button7.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button7.Location = new System.Drawing.Point(124, 124);
            this.button7.Name = "button7";
            this.button7.Size = new System.Drawing.Size(45, 45);
            this.button7.TabIndex = 7;
            this.button7.Text = "6";
            this.button7.UseVisualStyleBackColor = true;
            this.button7.Click += new System.EventHandler(this.button_click);
            //
            // button8
            //
            this.button8.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button8.Location = new System.Drawing.Point(73, 124);
            this.button8.Name = "button8";
            this.button8.Size = new System.Drawing.Size(45, 45);
            this.button8.TabIndex = 6;
            this.button8.Text = "5";
            this.button8.UseVisualStyleBackColor = true;
            this.button8.Click += new System.EventHandler(this.button_click);
            //
            // button9
            //
            this.button9.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button9.Location = new System.Drawing.Point(22, 124);
            this.button9.Name = "button9";
            this.button9.Size = new System.Drawing.Size(45, 45);
            this.button9.TabIndex = 5;
            this.button9.Text = "4";
            this.button9.UseVisualStyleBackColor = true;
            this.button9.Click += new System.EventHandler(this.button_click);
            //
            // button11
            //
            this.button11.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button11.Location = new System.Drawing.Point(175, 175);
            this.button11.Name = "button11";
            this.button11.Size = new System.Drawing.Size(45, 45);
            this.button11.TabIndex = 13;
            this.button11.Text = "-";
            this.button11.UseVisualStyleBackColor = true;
            this.button11.Click += new System.EventHandler(this.operator_click);
            //
            // button12
            //
            this.button12.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button12.Location = new System.Drawing.Point(124, 175);
            this.button12.Name = "button12";
            this.button12.Size = new System.Drawing.Size(45, 45);
            this.button12.TabIndex = 12;
            this.button12.Text = "3";
            this.button12.UseVisualStyleBackColor = true;
            this.button12.Click += new System.EventHandler(this.button_click);
            //
            // button13
            //
            this.button13.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button13.Location = new System.Drawing.Point(73, 175);
            this.button13.Name = "button13";
            this.button13.Size = new System.Drawing.Size(45, 45);
            this.button13.TabIndex = 11;
            this.button13.Text = "2";
            this.button13.UseVisualStyleBackColor = true;
            this.button13.Click += new System.EventHandler(this.button_click);
            //
            // button14
            //
            this.button14.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button14.Location = new System.Drawing.Point(22, 175);
            this.button14.Name = "button14";
            this.button14.Size = new System.Drawing.Size(45, 45);
            this.button14.TabIndex = 10;
            this.button14.Text = "1";
            this.button14.UseVisualStyleBackColor = true;
            this.button14.Click += new System.EventHandler(this.button_click);
            //
            // button15
            //
            this.button15.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button15.Location = new System.Drawing.Point(226, 175);
            this.button15.Name = "button15";
            this.button15.Size = new System.Drawing.Size(53, 96);
            this.button15.TabIndex = 19;
            this.button15.Text = "=";
            this.button15.UseVisualStyleBackColor = true;
            this.button15.Click += new System.EventHandler(this.button15_Click);
            //
            // button16
            //
            this.button16.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button16.Location = new System.Drawing.Point(175, 226);
            this.button16.Name = "button16";
            this.button16.Size = new System.Drawing.Size(45, 45);
            this.button16.TabIndex = 18;
            this.button16.Text = "+";
            this.button16.UseVisualStyleBackColor = true;
            this.button16.Click += new System.EventHandler(this.operator_click);
            //
            // button17
            //
            this.button17.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button17.Location = new System.Drawing.Point(124, 226);
            this.button17.Name = "button17";
            this.button17.Size = new System.Drawing.Size(45, 45);
            this.button17.TabIndex = 17;
            this.button17.Text = ".";
            this.button17.UseVisualStyleBackColor = true;
            this.button17.Click += new System.EventHandler(this.button_click);
            //
            // button19
            //
            this.button19.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.button19.Location = new System.Drawing.Point(22, 226);
            this.button19.Name = "button19";
            this.button19.Size = new System.Drawing.Size(96, 45);
            this.button19.TabIndex = 15;
            this.button19.Text = "0";
            this.button19.UseVisualStyleBackColor = true;
            this.button19.Click += new System.EventHandler(this.button_click);
            //
            // textBox_Result
            //
            this.textBox_Result.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.textBox_Result.Location = new System.Drawing.Point(22, 40);
            this.textBox_Result.Name = "textBox_Result";
            this.textBox_Result.Size = new System.Drawing.Size(257, 29);
            this.textBox_Result.TabIndex = 20;
            this.textBox_Result.Text = "0";
            this.textBox_Result.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
            //
            // labelCurrentOperation
            //
            this.labelCurrentOperation.AutoSize = true;
            this.labelCurrentOperation.BackColor = System.Drawing.SystemColors.Window;
            this.labelCurrentOperation.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.labelCurrentOperation.ForeColor = System.Drawing.SystemColors.ControlDark;
            this.labelCurrentOperation.Location = new System.Drawing.Point(18, 13);
            this.labelCurrentOperation.Name = "labelCurrentOperation";
            this.labelCurrentOperation.Size = new System.Drawing.Size(0, 24);
            this.labelCurrentOperation.TabIndex = 21;
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(305, 291);
            this.Controls.Add(this.labelCurrentOperation);
            this.Controls.Add(this.textBox_Result);
            this.Controls.Add(this.button15);
            this.Controls.Add(this.button16);
            this.Controls.Add(this.button17);
            this.Controls.Add(this.button19);
            this.Controls.Add(this.button11);
            this.Controls.Add(this.button12);
            this.Controls.Add(this.button13);
            this.Controls.Add(this.button14);
            this.Controls.Add(this.button5);
            this.Controls.Add(this.button6);
            this.Controls.Add(this.button7);
            this.Controls.Add(this.button8);
            this.Controls.Add(this.button9);
            this.Controls.Add(this.button4);
            this.Controls.Add(this.button3);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.buttonOne);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "Máy tính tuoitreit.vn";
            this.ResumeLayout(false);
            this.PerformLayout();
        }

        #endregion

        private System.Windows.Forms.Button buttonOne;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Button button3;
        private System.Windows.Forms.Button button4;
        private System.Windows.Forms.Button button5;
        private System.Windows.Forms.Button button6;
        private System.Windows.Forms.Button button7;
        private System.Windows.Forms.Button button8;
        private System.Windows.Forms.Button button9;
        private System.Windows.Forms.Button button11;
        private System.Windows.Forms.Button button12;
        private System.Windows.Forms.Button button13;
        private System.Windows.Forms.Button button14;
        private System.Windows.Forms.Button button15;
        private System.Windows.Forms.Button button16;
        private System.Windows.Forms.Button button17;
        private System.Windows.Forms.Button button19;
        private System.Windows.Forms.TextBox textBox_Result;
        private System.Windows.Forms.Label labelCurrentOperation;
    }
}
Program.cs
C#: 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace Calculator
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}
Đây là project mình đã tạo, bạn cần thì tải về nhé
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