计算器1 ------C#窗体
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms; namespace计算器{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private float op1,op2; private string st, st1; private char opr; private double re; private void button1_Click(object sender, EventArgs e) { st = st + '0'; this.textBox1.Text = st; } private void button4_Click(object sender, EventArgs e) { st = st + '1'; this.textBox1.Text = st; } private void button5_Click(object sender, EventArgs e) { st = st + '2'; this.textBox1.Text = st; } private void button6_Click(object sender, EventArgs e) { st = st + '3'; this.textBox1.Text = st; } private void button7_Click(object sender, EventArgs e) { st = st + '4'; this.textBox1.Text = st; } private void button8_Click(object sender, EventArgs e) { st = st + '5'; this.textBox1.Text = st; } private void button9_Click(object sender, EventArgs e) { st = st + '6'; this.textBox1.Text = st; } private void button10_Click(object sender, EventArgs e) { st = st + '7'; this.textBox1.Text = st; } private void button11_Click(object sender, EventArgs e) { st = st + '8'; this.textBox1.Text = st; } private void button12_Click(object sender, EventArgs e) { st = st + '9'; this.textBox1.Text = st; } private void button17_Click(object sender, EventArgs e) { int count; count=st.Length-1; if(count>=0) { st = st.Substring(0,st.Length-1); } this.textBox1.Text = st; } private void button13_Click(object sender, EventArgs e) { opr = '+'; st1 = st; st = ""; this.textBox1.Text = st; } private void button14_Click(object sender, EventArgs e) { opr = '-'; st1 = st; st = ""; this.textBox1.Text = st; } private void button15_Click(object sender, EventArgs e) { opr = '*'; st1 = st; st = ""; this.textBox1.Text = st; } private void button16_Click(object sender, EventArgs e) { opr = '/'; st1 = st; st = ""; this.textBox1.Text = st; } private void button20_Click(object sender, EventArgs e) { op1 = float.Parse(st1); op2 = float.Parse(st); if (opr == '+') re = op1 + op2; if (opr == '-') re = op1 - op2; if (opr == '*') re = op1 * op2; if (opr == '/') re = op1 / op2; this.textBox1.Text = re.ToString(); } private void button19_Click(object sender, EventArgs e) { st = ""; st1 = ""; this.textBox1.Text = ""; } private void button18_Click(object sender, EventArgs e) { st = ""; this.textBox1.Text = ""; } private void button21_Click(object sender, EventArgs e) { op1 = float.Parse(st); re = Math.Sqrt(op1); this.textBox1.Text = re.ToString(); } private void button3_Click(object sender, EventArgs e) { st = st + '.'; this.textBox1.Text = st; } private void button22_Click(object sender, EventArgs e) { op1 = float.Parse(st); re = 1 / op1; this.textBox1.Text = re.ToString(); } }}