Although it isn't the optimal solution, multiple elif statements can be used to mimic the switch case statement present in some other languages.

尽管它不是最优的解决方案，但是多个elif语句可以用于模拟其他一些语言中的switch case语句。

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Jumping into a statement expression with goto or using a switch statement outside the statement expression with a case or default label inside the statement expression is not permitted.

不允许使用switch语句或是goto跳入到声明表达式中。

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Within the switch statement of the tcp_usrreq function, the case for PRU_LISTEN checks if the socket is bound to the port.

在tcp_usrreq函数的切换语句中，PRU_LISTEN的实例检查套接字是否绑定到端口。

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