如果不声明函数原型，使用long long类型作为函数的参数可能会引起一些意想不到的错误。

There may be pitfalls when you use long long types for function arguments, unless you declare function prototypes.

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然而在使用空调的过程中，也会出现一些意想不到的麻烦，比如家用中央空调漏水就让很多消费者很头痛。

However, in the use of air conditioning process, there will be some unexpected problems, such as water leakage on the home central air conditioning so that many consumers are very headache.

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