That is, if a function has a certain set or range of valid values for its arguments, an assertion to this effect can be placed as the first line of code in the function.

那就是说，如果函数有确定的有效值集合或范围可作为参数，可以将检验参数是否有效的断言放在该函数代码的第一行。

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The function returns a specific value (or range of values) to indicate an error, and the global variable errno is set to indicate the cause of the problem.

函数返回特定值(或值范围)以指明错误，且设置全局变量errno以指明问题的起因。

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Users can adapt the scale of fuzzy range by setting parameter in membership function or altering values in the histogram, and set different confidence to query different reliable data.

用户通过设置隶属函数的参数、直方图的值调整模糊范围的大小，通过设置不同的可信度查询不同可靠性的数据。

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