C#实现计算器

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace Calculator { public partial class Form1 : Form { private double operand_one = 0.0; //第一个操作数，用于保存用户输入的值，默认为0 private double operand_two = 0.0; //第二个操作数，用于保存用户输入的值，默认为0 private string str; //用于保存运算符按下之前键入的数字 string op; //用于保存运算符的符号 public Form1() { InitializeComponent(); this.textBox1.Text = ""; } //初始化文本框，置0 private void button1_Click(object sender, EventArgs e) { this.textBox1.Text = ""; this.str = ""; operand_one = 0.0; operand_two = 0.0; }