程序

//计算器
//作者：Jack.F
//时间：2010-3-21
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 Counter
{
    public partial class limiting : Form
    {
        public limiting()
        {
            InitializeComponent();
        }

        private void count_Click(object sender, EventArgs e)
        {
            Single a, b, result = 0;
            a = Convert.ToSingle(num1.Text);
            b = Convert.ToSingle(num2.Text);
            switch (sign.SelectedItem.ToString())
            {
                case "+": result = a + b; break;
                case "-": result = a - b; break;
                case "*": result = a * b; break;
                case "/": result = a / b; break;
            }
            Convert.ToSingle(result.Text);

        }
    }
}