c#小程序---简单计算器（拷贝参考）

太过爱你忘了你带给我的痛 2021-06-24 16:10 369阅读 0赞

结果显示及相关备注：

![2789632-a6b2a4db223a4fa0.png][]

结果显示

![2789632-110140d71a86824a.png][]

结果显示

![2789632-fd62f653e32138aa.png][]

组件名称注释

代码：

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Runtime.InteropServices;
    using System.Text;
    using System.Windows.Forms;
    
    namespace Calculator
    {
        public partial class CalcForm : Form
        {
            private string strOutput = "";
            private double lNumFormer = 0;//前一个操作数
            private double lNumTemp = 0;//临时变量
            private double lResult = 0;//结果
            private char cOperator;//操作符
            private bool bDotClicked = false;//用于标记小数点是否被按下
            //private uint decimalIndex = 0;//用于标记当前小数点后精度位数，如3.14的decimalIndex==2
            double lastDecimalNum = 1;//最近一次点击的小数精度，即小数最后一位精度，如0.01
    
            public CalcForm()
            {
                InitializeComponent();
                //数字按钮0~9
                EventHandler eh = new EventHandler(Numbers_Click);
                button_num_0.Click += eh;
                button_num_1.Click += eh;
                button_num_2.Click += eh;
                button_num_3.Click += eh;
                button_num_4.Click += eh;
                button_num_5.Click += eh;
                button_num_6.Click += eh;
                button_num_7.Click += eh;
                button_num_8.Click += eh;
                button_num_9.Click += eh;
    
                //运算符+、-、*、/
                EventHandler eh2 = new EventHandler(Operators_Click);
                button_add.Click += eh2;
                button_sub.Click += eh2;
                button_mul.Click += eh2;
                button_div.Click += eh2;
            }
    
            private void CalcForm_Load(object sender, EventArgs e)
            {
    
            }
            //****数字按钮0-9
            private void button_num_0_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_1_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_2_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_3_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_4_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_5_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_6_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_7_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_8_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            private void button_num_9_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Numbers_Click（）函数
            }
    
            //****操作符+、-、*、/
            private void button_add_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Operators_Click（）函数
            }
    
            private void button_sub_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Operators_Click（）函数
            }
    
            private void button_mul_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Operators_Click（）函数
            }
    
            private void button_div_Click(object sender, EventArgs e)
            {
                //功能实现代码位于Operators_Click（）函数
            }
    
    
            //****等于号=
            private void button_enter_Click(object sender, EventArgs e)
            {
                try
                {
                    switch (cOperator)
                    {
                        case '+':
                            //计算并检测数据是否越界
                            checked { lResult = lNumFormer + lNumTemp; }
                            break;
                        case '-':
                            checked { lResult = lNumFormer - lNumTemp; }
                            break;
                        case '*':
                            checked { lResult = lNumFormer * lNumTemp; };
                            break;
                        case '/':
                            checked { lResult = lNumFormer / lNumTemp; };
                            break;
                    }
                }
                catch
                {
                    MessageBox.Show("运算结果溢出");
                }
    
                txtOutput.Text = lResult.ToString();
                //清空变量
                lNumFormer = 0;//前一个操作数
                lNumTemp = 0;//临时变量
                lResult = 0;//结果
                cOperator = '\0';//操作符
                strOutput = "";
                bDotClicked = false;
                lastDecimalNum = 1;
            }
    
            //****清空键CE
            private void button_ce_Click(object sender, EventArgs e)
            {
                //清空变量
                lNumFormer = 0;//前一个操作数
                lNumTemp = 0;//临时变量
                lResult = 0;//结果
                cOperator = '\0';//操作符
                strOutput = "";
                bDotClicked = false;
                lastDecimalNum = 1;
    
                //清空页面显示
                txtOutput.Text = "";
            }
    
            //****小数点.
            private void button_dot_Click(object sender, EventArgs e)
            {
                if (!bDotClicked)
                {
                    strOutput += ".";
                    txtOutput.Text = strOutput;
                    bDotClicked = true;
                }
            }
    
            //集中处理按钮点击事件
            //****数字按钮0-9
            private void Numbers_Click(object sender, EventArgs e)
            {
                string strClickNum = ((Button)sender).Text;
                try
                {
                    if (bDotClicked)
                    {
                        //得出点击的小数数值
                        //decimalIndex++;
                        lastDecimalNum *= 0.1;
                        checked { lNumTemp = lNumTemp + long.Parse(strClickNum) * lastDecimalNum; }
                    }
                    else
                    {
                        checked { lNumTemp = lNumTemp * 10 + long.Parse(strClickNum); }
                    }
                }
                catch
                {
                    //貌似double型并不会轻易溢出
                    MessageBox.Show("数据溢出");
                }
                txtOutput.Text = lNumTemp.ToString();
                strOutput += strClickNum;
                //strOutput = lNumTemp.ToString();
                txtOutput.Text = strOutput;
            }
    
            //集中处理按钮点击事件
            //****操作符+、-、*、/
            private void Operators_Click(object sender, EventArgs e)
            {
                string strClickOp = ((Button)sender).Text;
                cOperator = strClickOp[0];//strClickOp长度为1
                lNumFormer = lNumTemp;
                lNumTemp = 0;
                strOutput += cOperator.ToString();
                txtOutput.Text = strOutput;
                bDotClicked = false;
                lastDecimalNum = 1;
            }
    
            //键盘按键
            protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
            {
                // if it is a hotkey, return true; otherwise, return false
                switch (keyData)
                {
                    case Keys.NumPad0:
                        button_num_0.Focus();
                        button_num_0.PerformClick();
                        return true;
                    case Keys.NumPad1:
                        button_num_1.Focus();
                        button_num_1.PerformClick();
                        return true;
                    case Keys.NumPad2:
                        button_num_2.Focus();
                        button_num_2.PerformClick();
                        return true;
                    case Keys.NumPad3:
                        button_num_3.Focus();
                        button_num_3.PerformClick();
                        return true;
                    case Keys.NumPad4:
                        button_num_4.Focus();
                        button_num_4.PerformClick();
                        return true;
                    case Keys.NumPad5:
                        button_num_5.Focus();
                        button_num_5.PerformClick();
                        return true;
                    case Keys.NumPad6:
                        button_num_6.Focus();
                        button_num_6.PerformClick();
                        return true;
                    case Keys.NumPad7:
                        button_num_7.Focus();
                        button_num_7.PerformClick();
                        return true;
                    case Keys.NumPad8:
                        button_num_8.Focus();
                        button_num_8.PerformClick();
                        return true;
                    case Keys.NumPad9:
                        button_num_9.Focus();
                        button_num_9.PerformClick();
                        return true;
                    case Keys.Add:
                        button_add.Focus();
                        button_add.PerformClick();
                        return true;
                    case Keys.Subtract:
                        button_sub.Focus();
                        button_sub.PerformClick();
                        return true;
                    case Keys.Multiply:
                        button_mul.Focus();
                        button_mul.PerformClick();
                        return true;
                    case Keys.Divide:
                        button_div.Focus();
                        button_div.PerformClick();
                        return true;
                    case Keys.Enter:
                        button_enter.Focus();
                        button_enter.PerformClick();
                        return true;
                    case Keys.Escape:
                        button_ce.Focus();
                        button_ce.PerformClick();
                        return true;
                    case Keys.Decimal:
                        button_dot.Focus();
                        button_dot.PerformClick();
                        return true;
                    default:
                        break;
                }
                return base.ProcessCmdKey(ref msg, keyData);
            }
    
            private void txtOutput_TextChanged(object sender, EventArgs e)
            {
    
            }
        }
    }

[2789632-a6b2a4db223a4fa0.png]: /images/20210615/cc73826ed13f4a3cbebdb52ba5df6896.png
[2789632-110140d71a86824a.png]: /images/20210615/7b18a8fa6a21409282c1d97b9a3f2456.png
[2789632-fd62f653e32138aa.png]: /images/20210615/2486f3df00cf4acd8111aab307ce000c.png