C#双行计算器和单行计算器

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初学winform，写了一个单行计算器和一个双行计算器。主界面的和代码如下。

单行计算器：

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 Calculator
{public partial class Form1 : Form{public Form1(){InitializeComponent();}//定义并初始化三个字符串，分别用来储存运算符号、第一个数、第二个数。private string Operator = null;private string i1 = null;private string i2 = null;//获取结果的方法：通过运算符号、第一个数、第二个数来获取运算结果private double GetAnswer(string a, string b, string ope){switch (ope){case "u":return double.Parse(a) + double.Parse(b);case "n":return double.Parse(a) - double.Parse(b);case "t":return double.Parse(a) * double.Parse(b);case "v":return double.Parse(a) / double.Parse(b);default:return 0;}}//按下0-9数字按键来触发该方法。private void btn1_Click(object sender, EventArgs e){//通过事件源的名字的第四个字符来获取数字string number = (sender as Button).Name[3].ToString();//txtProcess用来显示计算过程if (Operator == null){i1 += number;txtShow.Text = i1;}else{i2 += number;txtShow.Text = i2;}btnDel.Enabled = true;}//获取并输出运算结果private void btnEnter_Click(object sender, EventArgs e){if (i1 != null && i2 != null){txtShow.Text = GetAnswer(i1, i2, Operator).ToString();i1 = null;i2 = null;Operator = null;//输出的结果不能进行回删，所以回删按键禁用。btnDel.Enabled = false;}}//单击运算符按键触发的方法private void btnPlus_Click(object sender, EventArgs e){//通过事件源的名字来获取运算符号，u代表加号，n减号，t乘法，v除法string operate = (sender as Button).Name[5].ToString();//如果已经进行过运算后直接按下运算符号，则将运算结果作为第一个数。if (i2 != null){txtShow.Text = GetAnswer(i1, i2, Operator).ToString();}i1 = txtShow.Text;Operator = operate;i2 = null;//将第二个数初始化btnDel.Enabled = false;}//CE按键用来初始化计算器private void btnCE_Click(object sender, EventArgs e){i1 = null;i2 = null;Operator = null;txtShow.Text = null;btnDel.Enabled = false;}//小数点按键private void btnPiont_Click(object sender, EventArgs e){if (Operator == null){i1 += ".";txtShow.Text = i1;}else{i2 += ".";txtShow.Text = i2;}}//回删按键private void btnDel_Click(object sender, EventArgs e){//如果未按下运算符号，则回删第一个数if (Operator == null){if (i1.Length >= 1){i1 = i1.Remove(i1.Length - 1);}txtShow.Text = i1;}else//否则回删第二个数{if (i2.Length >= 1){i2 = i2.Remove(i2.Length - 1);}txtShow.Text = i2;}}}
}

双行计算器：

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 Calculator
{public partial class Form1 : Form{public Form1(){InitializeComponent();}//定义并初始化三个字符串，分别用来储存运算符号、第一个数、第二个数。private string Operator = null;private string i1 = null;private string i2 = null;//定义一个字符串，保存原单行计算器显示的数字。双行计算器时，保存中间数据，当按下=键时候，显示结果。private string txtShowHide = null;//获取结果的方法：通过运算符号、第一个数、第二个数来获取运算结果private double GetAnswer(string a, string b, string ope){if (a != null && b != null){switch (ope){case "u":return double.Parse(a) + double.Parse(b);case "n":return double.Parse(a) - double.Parse(b);case "t":return double.Parse(a) * double.Parse(b);case "v":return double.Parse(a) / double.Parse(b);default:return 0;}}elsereturn 0;}//按下0-9数字按键来触发该方法。private void btn1_Click(object sender, EventArgs e){if (i1 == null)txtProcess.Text = null;//通过事件源的名字的第四个字符来获取数字string number = (sender as Button).Name[3].ToString();//txtProcess用来显示计算过程txtProcess.Text += number;if (Operator == null){i1 += number;//txtShow.Text = i1;txtShowHide = i1;}else{i2 += number;//txtShow.Text = i2;txtShowHide = i2;}btnDel.Enabled = true;}//获取并输出运算结果private void btnEnter_Click(object sender, EventArgs e){if (i1!=null&&i2 != null){txtShowHide = GetAnswer(i1, i2, Operator).ToString();txtShow.Text = txtShowHide;i1 = null;i2 = null;Operator = null;//输出的结果不能进行回删，所以回删按键禁用。btnDel.Enabled = false;txtProcess.Text += "=";}}//单击运算符按键触发的方法private void btnPlus_Click(object sender, EventArgs e){//txtProcess.Text = txtShow.Text;//通过事件源的名字来获取运算符号，u代表加号，n减号，t乘法，v除法string operate = (sender as Button).Name[5].ToString();//如果已经进行过运算并得出结果后，直接按下运算符号，则将运算结果作为第一个数。if (i2 != null){//txtShow.Text = GetAnswer(i1, i2, Operator).ToString();txtShowHide = GetAnswer(i1, i2, Operator).ToString();}i1 = txtShowHide;txtProcess.Text = i1;Operator = operate;i2 = null;//将第二个数初始化btnDel.Enabled = false;switch (operate){case "u":txtProcess.Text += "+";break;case "n":txtProcess.Text += "-";break;case "t":txtProcess.Text += "×";break;case "v":txtProcess.Text += "÷";break;}}//CE按键用来初始化计算器private void btnCE_Click(object sender, EventArgs e){i1 = null;i2 = null;Operator = null;txtShowHide = null;txtShow.Text = null;txtProcess.Text = null;btnDel.Enabled = false;}//小数点按键private void btnPiont_Click(object sender, EventArgs e){if (i1 == null)txtProcess.Text = null;txtProcess.Text += ".";if (Operator == null){i1 += ".";//txtShow.Text = i1;txtShowHide = i1;}else{i2 += ".";//txtShow.Text = i2;txtShowHide = i2;}}//回删按键private void btnDel_Click(object sender, EventArgs e){//如果未按下运算符号，则回删第一个数if (Operator == null){if (i1.Length >= 1){i1 = i1.Remove(i1.Length - 1);txtProcess.Text = txtProcess.Text.Remove(txtProcess.Text.Length - 1);}//txtShow.Text = i1;txtShowHide = i1;}else//否则回删第二个数{if (i2.Length >= 1){i2 = i2.Remove(i2.Length - 1);txtProcess.Text = txtProcess.Text.Remove(txtProcess.Text.Length - 1);}//txtShow.Text = i2;txtShowHide = i2;}}}
}

简要说明：

1.单行和双行计算器，可以实现加减乘除无括号四则运算。如123+234，12+34+97+66，6*92-555；
2.也可以在算出结果后，以结果为因数继续计算。如5*9=45，然后直接 +3=48；
3.双行计算器第一行只显示计算过程，第二行只显示计算结果。
4.←键为回删键，CE键为复位键。
5.难免依然存在bug，欢迎指出。
           

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