【蝴蝶廢墟】

switch (變數)
            {
                case 10: 
                    MessageBox.Show("10");
                    break; //注意每個case結束一定要加上break
                case 9:
                    MessageBox.Show("9");
                    break;
                case 8:
                    MessageBox.Show("8");
                    break;
                case 7:
                    MessageBox.Show("7");
                    break;
                case 6:
                case 5:
                case 4:
                case 3:
                case 2:
                case 1:
                case 0:
                    MessageBox.Show("0");
                    break;
                default: //例外狀況
                    MessageBox.Show("錯誤");
                    break;
         }