C# switch 语句的简单应用

public Form1()
{
InitializeComponent();
}

    private void button1_Click(object sender, EventArgs e)    {        int a =Convert.ToInt16(textBox1.Text);        int b = 0;        string c = "";        int d = a / 10;        switch(d){            case 10: break;            case 9: c = "A"; break;            case 8: c = "B"; break;            case 7: c = "C"; break;            case 6: c = "D"; break;            default:                c = "E";break;        }        textBox2.Text = c;    }    ![这里写图片描述](http://img.blog.csdn.net/20170226113807562?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc2FuZ2ppc3VvbmFu/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)