用c#编写计算器.doc

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 Study 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; else textBox1.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 /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; /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 /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 /开平方 private void doSquart() double storNum; storNum = double.Parse(textBox1.Text); if (storNum 0) storNum = Math.Sqrt(storNum); textBox1.Text = storNum.ToString(); else textBox1.Text = 负数不能开平方。; btnEqual.Select(); /设置=号的焦点 /求倒数 private void doreciprocal() double storNum; storNum = double.Parse(textBox1.Text); if (storNum != 0) storNum = 1 / storNum; textBox1.Text = storNum.ToString(); else textBox1.Text = 除数不能为零。; btnEqual.Select(); 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 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 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 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)/正负号交换 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)/清除键 isSecond = false; setText(clear); private void btnSqrt_Click(object sender, EventArgs e)/开平方 doSquart(); private void btnPercentage_Click(object sender, EventArgs e)/求模 setOperator(5); private void btnReciprocal_Click(object sender, EventArgs e)/求倒 doreciprocal(); private void btnCE_Click(object sender, EventArgs e)/CE isSecond = f