c#笔记（四）——switch

switch (date)

            {

                case 1:

                    Console .WriteLine("周一" );

                    break ;

                case 2:

                    Console .WriteLine("周二" );

                    break ;

                case 3:

                    Console .WriteLine("周三" );

                    break ;

                case 4:

                    Console .WriteLine("周四" );

                    break ;

                case 5:

                    Console .WriteLine("周五" );

                    break ;

                case 6:

                    Console .WriteLine("周六" );

                    break ;

                case 7:

                    Console .WriteLine("周日" );

                    break ;

                default :

                    Console .WriteLine("大保健" );

                    break ;

            }

1.switch里面可以没有default语句块，如果所有的case都不符合要求时

            会直接跳出switch开关

            2.如果case后面有语句，则一定要有break

            3.如果case后面没有任何代码，它会和他后面的case共用一段代码

            4.default的位置是随意的

            5.case的位置不确定