form1.cs

来自「Visual C#2005程序设计教程」· CS 代码 · 共 73 行

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成绩等级
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int score=int.Parse(txtScore.Text);
            /* 无内嵌语句的共用
            switch (score / 10)
            {
                case 10:
                    txtGrade.Text = "A";
                    break;
                case 9:
                    txtGrade.Text = "A";
                    break;
                case 8:
                    txtGrade.Text = "B";
                    break;
                case 7:
                    txtGrade.Text = "C";
                    break;
                case 6:
                    txtGrade.Text = "D";
                    break;
                default:
                    txtGrade.Text = "E";
                    break;
            }
            */
            switch (score / 10)
            {
                case 10:
                case 9:
                    txtGrade.Text = "A";
                    break;
                case 8:
                    txtGrade.Text = "B";
                    break;
                case 7:
                    txtGrade.Text = "C";
                    break;
                case 6:
                    txtGrade.Text = "D";
                    break;
                case 5:
                case 4:
                case 3:
                case 2:
                case 1:
                case 0:
                    txtGrade.Text = "E";
                    break;
                default:
                    MessageBox.Show("输入的分数不正确！");
                    break;
            }
        }
    }
}