form1.cs

Visual C#2005程序设计教程

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WinApp4_5商品打折
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double money, discount, cutRate=1;
            int m;
            money = double.Parse(txtMoney.Text);
            /*  */
            if (money >= 5000)
                m = 10;
            else
                m = (int)(money / 500);
             
            // m = (int)(money / 500);
            switch(m)
            {
                case 0: cutRate = 1; break;   // money<500元的折扣
                case 1: cutRate = .95; break;   // 500≤money<1000元的折扣
                case 2: cutRate = .9; break;   // 以下为1000≤money<3000元的折扣
                case 3: cutRate = .9; break;
                case 4: cutRate = .9; break;
                case 5: cutRate = .9; break;
                case 6: cutRate = .85; break;   // 以下为3000≤money<5000元的折扣
                case 7: cutRate = .85; break;
                case 8: cutRate = .85; break;
                case 9: cutRate = .85; break;
                case 10: cutRate = .8; break;   // money≥5000元的折扣
                default: MessageBox.Show("金额输入错误!"); return;   // 输入错误
                //default: cutRate = .8; break;   // money≥5000元的折扣
            }
            discount = money * cutRate;
            txtDiscount.Text = discount.ToString();
        }
    }
}