Functions can be defined within another function and assigned to global variables or returned as results.

函数可在另一个函数内定义，还可赋给全局变量或作为结果返回。

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In the code section, you define a function's address the same way you defined addresses for global variables above — just put their name followed by a colon.

在代码部分，定义了一个函数地址，方法同上述定义全局变量的相同——只需在它们的名称之后跟上一个冒号。

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Let's take a look at some additional error-related global variables and the standard defined by POSIX-1003.1 errno values.

让我们了解一些与错误相关的其他全局变量，以及由POSIX - 1003.1 errno值定义的标准。

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