C#怎么实现计算器窗体程序

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功能设计

1、计算器中，添加 0-9 共十个数字键。

2、计算器中，增添 加、减、乘、除、等于五个功能键。

3、计算器中，增加四个功能键：x2，sqrt，log, ln 四个键，分别计算求平方，开方。

实现代码

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 test3_1{    public partial class Form1 : Form    {        double result = 0;              //存储计算结果        double number = 0;              //存储输入的数字        bool exist_value = false;       //判断文本框中是否有值        string operation;               //存储输入的运算符        /*         * 初始化         */        public Form1()        {            InitializeComponent();        }        /*         * 数字键触发事件实现         */        private void Seven_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "7";        }        private void Eight_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "8";        }        private void Nine_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "9";        }        private void Four_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "4";        }        private void Five_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "5";        }        private void Six_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "6";        }        private void One_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "1";        }        private void Two_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "2";        }        private void Three_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "3";        }        private void Zero_Click(object sender, EventArgs e)        {            if (exist_value == true)            {                textBox1.Text = "";                exist_value = false;            }            textBox1.Text += "0";        }        /*         * 功能键触发事件         */        private void Add_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "+";            }        }        private void Sub_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "-";            }        }        private void Mul_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "*";            }        }        private void Div_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "/";            }        }        private void Squ_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "x^2";            }                       }        private void Sqrt_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "sqrt";            }        }        private void Log_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "log";            }        }        private void Ln_Click(object sender, EventArgs e)        {            if (textBox1.Text == "")            {                MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);            }            else            {                exist_value = true;                number = double.Parse(textBox1.Text);                operation = "ln";            }        }        private void Del_Click(object sender, EventArgs e)        {            textBox1.Text = "";        }        private void Equ_Click(object sender, EventArgs e)        {            switch (operation)            {                case "+": result = number + double.Parse(textBox1.Text); break;                case "-": result = number - double.Parse(textBox1.Text); break;                case "*": result = number * double.Parse(textBox1.Text); break;                case "/":                    {                        double temp=double.Parse(textBox1.Text);                        if (temp != 0)                            result = number / temp;                        else                            MessageBox.Show("除数不能为零", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);                        break;                    }                case "x^2": result = number * number; break;                case "sqrt": result = Math.Sqrt(number); break;                case "log": result = Math.Log10(number); break;                case "ln": result = Math.Log(number); break;            }            textBox1.Text = result + "";            exist_value = true;        }    }}

界面设计

运行结果

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