如题。计算器的运行界面如下:
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Visual studio c#计算器源程序如下:
- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Data;
- using System.Drawing;
- using System.Linq;
- using System.Text;
- using System.Windows.Forms;
- using System.Text.RegularExpressions;
- using System.Collections;
- namespace Calculators
- {
- public partial class Form1 : Form
- {
- public Form1()
- {
- InitializeComponent();
- }
- private void ShowAsStandard()//“标准型”模式
- {
- groupT.Location = new Point(6, 78);//groupT中存放标准型模式下的按钮控件
- txtEnterBox.Size = new Size(250, 23);
- txtExpression.Size = new Size(250, 14);
- groupShowWindow.Size = new Size(260, 49);
- groupS.Location = new Point(-333, 77);//groupT中存放科学型模式下特有的按钮控件
- this.Size = new Size(290, 349);
- }
- private void ShowAsScience()//“科学型”模式
- {
- groupT.Location = new Point(268, 78);
- txtEnterBox.Size = new Size(511, 23);
- txtExpression.Size = new Size(511, 14);
- groupShowWindow.Size = new Size(517, 49);
- groupS.Location = new Point(3, 77);
- this.Size = new Size(551, 349);
- }
- private void Form1_Load(object sender, EventArgs e)
- {
- //界面初始化为“标准型”的样子
- ShowAsStandard();
- }
- //================标志================================================
- private Expression leftValue = null;//左操作数
- bool txtEnterBoxClearFlag = true;//是否清除txtEnterBox的标志,是否可启用backspace的标志
- bool txtExpressionClearFlag = true;//是否清除txtExpression的标志
- bool txtExpressionInsertFlag = true;//是否在txtExpression中插入新数据的标志
- bool btnBackSpaceEnableFlag = true;//是否启用BackSpace键
- //====================================================================
- string op;//操作符
- Expression expression = null;//表达式对象
- private void btn0_Click(object sender, EventArgs e)//数字及点号按钮被按下时触发该事件
- {
- Button btn = sender as Button;
- if (txtEnterBoxClearFlag)
- {
- txtEnterBox.Clear();
- }
- if (txtExpressionClearFlag)
- {
- txtExpression.Clear();
- }
- txtEnterBox.Text += btn.Text;
- txtEnterBoxClearFlag = false;
- txtExpressionClearFlag = false;
- btnBackSpaceEnableFlag = true;
- }
- private void buttonClear_Click(object sender, EventArgs e)
- {
- #region 清除数字显示框、表达式显示框及左操作数
- txtEnterBox.Text = "0";
- txtExpression.Text = "";
- leftValue = null;//左操作数清空
- #endregion
- }
- private void txtEnterBox_TextChanged(object sender, EventArgs e)
- {
- #region 检查输入数字是否规范
- if (Regex.IsMatch(txtEnterBox.Text, "^[0]+[1-9]+")) //1.非小数数字不能以0开头。
- {
- txtEnterBox.Text = Regex.Replace(txtEnterBox.Text, "^0+", "");
- }
- if (Regex.IsMatch(txtEnterBox.Text, "^0+"))//2.数字开头不能连续输入多个0,最多只能输入一个
- {
- txtEnterBox.Text = Regex.Replace(txtEnterBox.Text, "^0+", "0");
- }
- if (Regex.IsMatch(txtEnterBox.Text, "[.].*[.]"))//3.数字中小数点个数不能超过1
- {
- txtEnterBox.Text = Regex.Replace(txtEnterBox.Text, "[.]{1}$", "");
- }
- #endregion
- }
- private void btnNegative_Click(object sender, EventArgs e)
- {
- #region 将输入框中的数字乘以-1
- double dTemp = Convert.ToDouble(txtEnterBox.Text);
- dTemp = dTemp * (-1);
- txtEnterBox.Text = dTemp.ToString();
- #endregion
-
- }
- private void btnAdd_Click(object sender, EventArgs e)//双目运算符:加减乘除、取余按钮按下时触发该事件
- {
- Button btn = sender as Button;
- if (txtExpressionInsertFlag)
- {
- txtExpression.Text += txtEnterBox.Text + btn.Text;//表达式显示控件添加数值输入控件中的值和操作符的值
- }
- else
- {
- txtExpression.Text += btn.Text;//表达式显示控件仅添加操作符的值
- }
- if (leftValue == null)
- {
- leftValue = new Constant(Convert.ToDouble(txtEnterBox.Text));//创建左操作数
- }
- else
- {
- Constant RightVaue = new Constant(Convert.ToDouble(txtEnterBox.Text));//创建右操作数
- expression = new Operation(leftValue, op, RightVaue);//创建表达式
- leftValue = expression;//将表达式赋值给左操作数
- txtEnterBox.Text = expression.Evaluate().ToString();//数值输入控件显示当前计算值
- }
- op = btn.Text;//更新操作符
- txtEnterBoxClearFlag = true;
- txtExpressionClearFlag = false;
- txtExpressionInsertFlag = true;
- btnBackSpaceEnableFlag = false;
- }
- private void btnEvaluate_Click(object sender, EventArgs e)//按下等于号按钮
- {
-
- if (leftValue != null)
- {
- Constant RightVaue = new Constant(Convert.ToDouble(txtEnterBox.Text));//创建右操作数
- expression = new Operation(leftValue, op, RightVaue);//创建表达式
- leftValue = null;//清空左操作数
- txtEnterBox.Text = expression.Evaluate().ToString();
-
- }
- else
- {
- leftValue = new Constant(Convert.ToDouble(txtEnterBox.Text));//创建左操作数
- }
- txtExpression.Clear();
- txtEnterBoxClearFlag = true;
- btnBackSpaceEnableFlag = false;
- }
- private void btnSqrt_Click(object sender, EventArgs e)//单目运算符:计算平方根,求倒数按钮按下时触发该事件
- {
- Button btn = sender as Button;
- txtExpression.Text +=(string)btn.Tag+ "(" + txtEnterBox.Text + ")";//表达式显示控件显示当前表达式
- leftValue = new Constant(Convert.ToDouble(txtEnterBox.Text));//创建左操作数
- expression = new Operation(leftValue, btn.Text, null);//创建表达式
- leftValue = null;
- txtEnterBox.Text = expression.Evaluate().ToString();
- txtEnterBoxClearFlag = true;
- txtExpressionClearFlag = true;
- txtExpressionInsertFlag = false;
- btnBackSpaceEnableFlag = false;
-
- }
- private void btnBackSpace_Click(object sender, EventArgs e)
- {
- if (btnBackSpaceEnableFlag)
- {
- int strLength = txtEnterBox.Text.Length;
- if (strLength==1)
- {
- txtEnterBox.Text = "0";//只剩一个字符时,将该字符修改为0
- ……………………
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