1.   实验目的

（  1）熟悉C#语言的使用和语法知识

2.   实验要求

（1）设计简单的含交互界面的计算器软件，具有较强的用户体验感。

（2）使用C#语言进行编程，创建窗体应用程序。

（3）实现较简单加减乘除等运算。

3.    运行效果如下：

4.    效果特点：

（1）每个按钮均可输入，但会阻止一些非法输入，例如，在没有输入数字的时候就输入运算符，点号的多次输入，这些都会阻止。

（2）实现了运算的优先级，即乘除是先与加减计算的。

（3）可实现小数的计算，即弥补了整型无法得打小数的缺陷

（4）增加了归零按钮，一键返回到初始状态

（5）按钮和键盘绑定，可实现键盘敲击时，界面按钮同时相应

（6）结果可继续运算，在点击“=”完成后，可在第二个文本框中输出结果，这时，如果在点击运算符，可对这个结果继续进行操作，实现完美的可继续性

5.代码如下：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace 按键计算器

{

    public partial class Form1 : Form

    {

        double[] number = new double[];

        char[] operat = new char[];

        bool isNumber = false;

        bool isDot = false;

        bool isOperat = false;

        bool isEqual = false;

        int numberIndex = ;

        int operatIndex = ;

        int dotCount = ;

        public Form1()

        {

            InitializeComponent();

            btnleft.Hide();

            btnright.Hide();

        }

        //将键盘与按钮关联

        protected override bool ProcessCmdKey(ref   Message msg, Keys keyData)

        {

            if (keyData == Keys.NumPad1||keyData==Keys.D1)

            {

                this.btn1.Focus();

                this.btn1.PerformClick();

             }

            if (keyData == Keys.NumPad2 || keyData == Keys.D2)

            {

                this.btn2.Focus();

                this.btn2.PerformClick();

            }

            if (keyData == Keys.NumPad3 || keyData == Keys.D3)

            {

                this.btn3.Focus();

                this.btn3.PerformClick();

            }

            if (keyData == Keys.NumPad4 || keyData == Keys.D4)

            {

                this.btn4.Focus();

                this.btn4.PerformClick();

            }

            if (keyData == Keys.NumPad5 || keyData == Keys.D5)

            {

                this.btn5.Focus();

                this.btn5.PerformClick();

            }

            if (keyData == Keys.NumPad6 || keyData == Keys.D6)

            {

                this.btn6.Focus();

                this.btn6.PerformClick();

            }

            if (keyData == Keys.NumPad7 || keyData == Keys.D7)

            {

                this.btn7.Focus();

                this.btn7.PerformClick();

            }

            if (keyData == Keys.NumPad8 || keyData == Keys.D8)

            {

                this.btn8.Focus();

                this.btn8.PerformClick();

            }

            if (keyData == Keys.NumPad9 || keyData == Keys.D9)

            {

                this.btn9.Focus();

                this.btn9.PerformClick();

            }

            if (keyData == Keys.NumPad0 || keyData == Keys.D0)

            {

                this.btn0.Focus();

                this.btn0.PerformClick();

            }

            if (keyData == Keys.Add)

            {

                this.btnadd.Focus();

                this.btnadd.PerformClick();

            }

            if (keyData == Keys.Subtract || keyData == Keys.OemMinus)

            {

                this.btnsub.Focus();

                this.btnsub.PerformClick();

            }

            if (keyData == Keys.Multiply)

            {

                this.btnmul.Focus();

                this.btnmul.PerformClick();

            }

            if (keyData == Keys.Divide)

            {

                this.btndiv.Focus();

                this.btndiv.PerformClick();

            }

            if (keyData == Keys.Enter || keyData == Keys.Oemplus)

            {

                this.btnequ.Focus();

                this.btnequ.PerformClick();

            }

            if (keyData == Keys.Back)

            {

                this.btncle.Focus();

                this.btncle.PerformClick();

            }

        return base.ProcessCmdKey(ref   msg, keyData);

        }  

        private void btn1_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text ="";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn2_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn3_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn4_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn5_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn6_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn7_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn8_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn9_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btn0_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                textBox1.Text = "";

                textBox2.Text = "";

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            textBox1.Text = textBox1.Text + "";

            textBox2.Text = textBox2.Text + "";

            isNumber = true;

            isDot = false;

            isOperat = false;

            isEqual = false;

        }

        private void btnf_Click(object sender, EventArgs e)

        {

            if ((isNumber == true)&&(dotCount==))

            {

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

                textBox2.Text = textBox2.Text + ".";

                dotCount++;

                isNumber = false;

                isDot = true;

                isOperat = false;

                isEqual = false;

            }

        }

        private void btnadd_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                operat[operatIndex] = '+';

                textBox1.Text = textBox2.Text + "+";

                textBox2.Text = "";

                numberIndex++;

                operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            if ((isOperat==false)&&(isDot==false)&&(isNumber == true))

            {

                    number[numberIndex] = double.Parse(textBox2.Text);

                    operat[operatIndex] = '+';

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

                    textBox2.Text = "";

                    numberIndex++;

                    operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

        }

        private void textBox1_TextChanged(object sender, EventArgs e)

        {

        }

        private void btnmul_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                operat[operatIndex] = '*';

                textBox1.Text = textBox2.Text + "*";

                textBox2.Text = "";

                numberIndex++;

                operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            if ((isOperat == false) && (isDot == false) && (isNumber == true))

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                operat[operatIndex] = '*';

                textBox1.Text = textBox1.Text + "*";

                textBox2.Text = "";

                numberIndex++;

                operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

        }

        private void btndiv_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                operat[operatIndex] = '/';

                textBox1.Text = textBox2.Text + "/";

                textBox2.Text = "";

                numberIndex++;

                operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            if ((isOperat == false) && (isDot == false) && (isNumber == true))

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                operat[operatIndex] = '/';

                textBox1.Text = textBox1.Text + "/";

                textBox2.Text = "";

                numberIndex++;

                operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

        }

        private void btnsub_Click(object sender, EventArgs e)

        {

            if (isEqual == true)

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                operat[operatIndex] = '-';

                textBox1.Text = textBox2.Text + "-";

                textBox2.Text = "";

                numberIndex++;

                operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

            if ((isOperat == false) && (isDot == false) && (isNumber == true))

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                operat[operatIndex] = '-';

                textBox1.Text = textBox1.Text + "-";

                textBox2.Text = "";

                numberIndex++;

                operatIndex++;

                dotCount = ;

                isNumber = false;

                isDot = false;

                isOperat = true;

                isEqual = false;

            }

        }

        private void btnequ_Click(object sender, EventArgs e)

        {

            if (textBox2.Text != "")

            {

                number[numberIndex] = double.Parse(textBox2.Text);

                //判断乘除

                for (int i = ; i < operatIndex;)

                {

                    //对乘号分析

                    if (operat[i] == '*')

                    {

                        number[i] = number[i] * number[i + ];

                        for (int j = i + ; j < operatIndex; j++)

                        {

                            number[j] = number[j + ];

                            operat[j - ] = operat[j];

                        }

                        numberIndex--;

                        operatIndex--;

                    }

                    //对除号分析

                    else if (operat[i] == '/')

                    {

                        number[i] = number[i] / number[i + ];

                        for (int j = i + ; j < operatIndex; j++)

                        {

                            number[j] = number[j + ];

                            operat[j - ] = operat[j];

                        }

                        numberIndex--;

                        operatIndex--;

                    }

                    else

                    { i++; }

                }

                //判断加减

                for (int i = ; i < operatIndex;)

                {

                    //对加号分析

                    if (operat[i] == '+')

                    {

                        number[i] = number[i] + number[i + ];

                        for (int j = i + ; j < operatIndex; j++)

                        {

                            number[j] = number[j + ];

                            operat[j - ] = operat[j];

                        }

                        numberIndex--;

                        operatIndex--;

                    }

                    //对减号分析

                    else if (operat[i] == '-')

                    {

                        number[i] = number[i] - number[i + ];

                        for (int j = i + ; j < operatIndex; j++)

                        {

                            number[j] = number[j + ];

                            operat[j - ] = operat[j];

                        }

                        numberIndex--;

                        operatIndex--;

                    }

                    else { i++; }

                }

                textBox2.Text = number[].ToString();

                isNumber = false;

                isDot = false;

                isOperat = false;

                isEqual = true;

                numberIndex = ;

                operatIndex = ;

            }

        }

        private void btncle_Click(object sender, EventArgs e)

        {

           isNumber = false;

           isDot = false;

           isOperat = false;

           isEqual = false;

            numberIndex = ;

            operatIndex = ;

           dotCount = ;

           textBox1.Text = "";

           textBox2.Text = "";

        }

        private void btnleft_Click(object sender, EventArgs e)

        {

        }

        private void btnright_Click(object sender, EventArgs e)

        {

        }

    }

}

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