简易计算器c界面设计与代码

简易计算器C#界面设计与代码简易计算器是用vs2008编译的c# 程序，仅供参考，存在不足之处，望大家见谅！windows界面设计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;namespace 简易计算器public partial class Form1 : Formpublic Form1()InitializeComponent();private int opMain = 0; / 运算类型，其中1(加法) 2(减法) 3(乘法) 4(除法) private double mainNum1 = 0; / 存储第一个数 private double mainNum2 = 0; / 存储第二个数 private bool isSecond = false; / 用来判断输入的是第一个还是第二个数 private bool isDone = false; / 用来判断是否按了等于按钮 private bool isDecimal = false; / 用来判断是否有小数 private bool isNokeydown = false;/ 用来判断是否没输入第二个数而按了“=“号键 private bool isKeyupclear = true;/用来判断是否按了clear键,程序开始前默认按了; public void setText(string textest) /设置文本框的值 if (textest.Equals(“clear“)textBox1.Text = “0.“;isSecond = false;isDone = false;isDecimal = false;isKeyupclear = true;elseif (isSecond)textBox1.Text = textest;isSecond = false;isDecimal = false;elseif (isDone)textBox1.Text = textest;isDone = false;elseif (isKeyupclear) /对是否按下clear键的判断 textBox1.Text = textest;isKeyupclear = false;elsetextBox1.Text += textest;btnEqual.Select(); /设置“=“号的焦点 public void Calc(double num1, double num2, int op)double answer = 0;switch (op) /判断所进行的运算 case 1:answer = num1 + num2;break;case 2:answer = num1 - num2;break;case 3:answer = num1 * num2;break;case 4:answer = num1 / num2;break;case 5:answer = num1 % num2;break;setText(answer.ToString(); /显示结果 /切换正负 private void changeSign()double storNum;if (textBox1.Text.Length 0)storNum = double.Parse(textBox1.Text);storNum *= -1;textBox1.Text = storNum.ToString();btnEqual.Select(); /设置“=“号的焦点 /执行运算 private void doEquals()if (isNokeydown) /判断已经输入第二个数后按了“=“号键 mainNum2 = double.Parse(textBox1.Text);setText(“clear“);Calc(mainNum1, mainNum2, opMain);isDone = true;isNokeydown = false;/设置运算类型 private void setOperator(int operation)if (textBox1.Text.Length 0)opMain = operation;mainNum1 = double.Parse(textBox1.Text);isSecond = true;isDone = false;isNokeydown = true;btnEqual.Select(); /设置“=“号的焦点 /设置小数点 private void setDecimal()if (!isDecimal)setText(“.“);isDecimal = true;btnEqual.Select(); /设置“=“号的焦点 private void btn1_Click(object sender, EventArgs e)setText(“1“);private void btn2_Click(object sender, EventArgs e)setText(“2“);private void btn3_Click(object sender, EventArgs e)setText(“3“);private void btn4_Click(object sender, EventArgs e)setText(“4“);private void btn5_Click(object sender, EventArgs e)setText(“5“);private void btn6_Click(object sender, EventArgs e)setText(“6“);private void btn7_Click(object sender, EventArgs e)setText(“7“);private void btn8_Click(object sender, EventArgs e)setText(“8“);private void btn9_Click(object sender, EventArgs e)setText(“9“);private void btn0_Click(object sender, EventArgs e)setText(“0“);private void btnPoint_Click(object sender, EventArgs e)setDecimal();private void btnSubtract_Click(object sender, EventArgs e)changeSign(); private void btnEqual_Click(object sender, EventArgs e)doEquals(); private void btnAdd_Click(object sender, EventArgs e)setOperator(1); private void btnSub_Click(object sender, EventArgs e)setOperator(2); private void btnMulti_Click(object sender, EventArgs e)setOperator(3); private void btnDivide_Click(object sender, EventArgs e)setOperator(4); private void btnC_Click(object sender, EventArgs e)isSecond = false;setText(“clear“); private void btnSqrt_Click(object sender, EventArgs e)doSquart();private void btnBackspace_Click(object sender, EventArgs e)string old = textBox1.Text;if (old.Length 1 elsetextBox1.Text = “0.“;private void doSquart()double storNum;storNum = double.Parse(textBox1.Text);if (storNum 0)storNum = Math.Sqrt(storNum);textBox1.Text = storNum.ToString();elsetextBox1.Text = “负数不能开平方。“;btnEqual.Select(); /设置“=“号的焦点 private void btn_Click(object sender, EventArgs e)setText(“3.1415926“);private void btnPercentage_Click(object sender, EventArgs e)setOperator(5);private void btnReciprocal_Click(object sender, EventArgs e)doreciprocal();private void doreciprocal()double storNum;storNum = double.Parse(textBox1.Text);if (storNum != 0)storNum = 1 / storNum;textBox1.Text = storNum.ToString();els