在使用switch语句时，需要注意每个case语句结束时要使用break语句，以避免出现“穿透”现象，即执行完一个case后会继续执行下一个case。

原因是 switch 语句也是分⽀效果的，只有在 switch 语句中使⽤ break 才能在跳出 switch 语 句，如果某⼀个 case 语句的后边没有 ...

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Factorial of an integer is defined by the following function

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Time Limit: 1 Sec Memory Limit: 128 MB Submit: 197 Solved: 46 Su...