用case结构时的一个错误，不知道怎么改正，请指教。
时间：12-13
整理：3721RD
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提示是这样的
A Case structure must have a case corresponding to every possible value of the selector. An easy way to fill this requirement is to specify a default case or cases whose selector values include ranges to or from infinity.
谢谢
A Case structure must have a case corresponding to every possible value of the selector. An easy way to fill this requirement is to specify a default case or cases whose selector values include ranges to or from infinity.
谢谢
使用CASE结构时，应包含所有可能的情形。你可能对一些例外的情形没有设计处理程序。
an easy way to fill this requiremen is to specify a default case of cases...
在某个case上点右键，设置当前case为默认case即可