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 ponentModel;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 : Form{public 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;}else{if (isSecond){textBox1.Text = textest;isSecond = false;isDecimal = false;}else{if (isDone){textBox1.Text = textest;isDone = false;}else{if (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 && old != "0.")textBox1.Text = old.Substring(0, 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 btnπ_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();}elsetextBox1.Text = "除数不能为零。