initialization of 'XXX' is skipped by 'case' label

中文翻译大致是xxx的初始化由于“case”被跳过

出现error的原因是switch 的 case 中不能定义变量。例如case：int num；。

解决方法是：

在case中用{}将代码括起来,这样在{}中就能定义变量了;

又或者直接用if-else代替switch

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