计算器编程代码

精品文档 1欢迎下载 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 calculator public partial class Form1 Form public Form1 InitializeComponent private void Form1 Load object sender EventArgs e private void btn Add Click object sender EventArgs e Button btn Button sender 空格用来分隔数值和运算符 txt Result Text txt Result Text btn Text private void btn Result Click object sender EventArgs e 保存计算结果 double d result 保存文本框中的算术表达式 string s txt txt Result Text 查找空格位置 int space s txt IndexOf s1保存第一个运算数 string s1 s txt Substring 0 space operation 用来保存运算数 char opoperation Convert ToChar s txt Substring space 1 1 s2保存第二个运算数 string s2 s txt Substring space 3 将运算数从 string 转成 Double型 double arg1 Convert ToDouble s1 double arg2 Convert ToDouble s2 根据运算符进行计算 switch opoperation case d result arg1 arg2 break case d result arg1 arg2 精品文档 2欢迎下载 break case d result arg1 arg2 break case if arg2 0 抛出异常 throw new ApplicationException else d result arg1 arg2 break default throw new ApplicationException 将计算结果显示在文本框中 txt Result Text d result ToString private void btn Clear Click object sender EventArgs e 将文本清空 txt Result Text private void button0 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void but1 Click object sender EventArgs e Button btn Button sender 空格用来分隔数值和运算符 txt Result Text txt Result Text btn Text private void but2 Click object sender EventArgs e Button btn Button sender 空格用来分隔数值和运算符 txt Result Text txt Result Text btn Text private void but3 Click object sender EventArgs e Button btn Button sender 空格用来分隔数值和运算符 txt Result Text txt Result Text btn Text private void button1 Click object sender EventArgs e 精品文档 3欢迎下载 Button btn Button sender txt Result Text btn Text private void button2 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void button3 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void button4 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void button5 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void button6 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void button7 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void button8 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void button9 Click object sender EventArgs e Button btn Button sender txt Result Text btn Text private void lbl Result Click object sender EventArgs e 精品文档 4欢