August 2021
Intermediate to advanced
450 pages
9h 36m
Chinese
Content preview from C++程序设计：原理与实践（基础篇）（原书第2版）
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8.5.1 声明参数和返回类型
函数是C++中我们用来命名和表示计算和操作的语法结构。一个函数声明由一个返回值后跟函数名，再接一个形式参数（formal argument，简称形参）列表构成。例如：
一个函数定义包含函数体（调用此函数时应执行的语句），而一个非定义的函数声明则只接一个分号。形参通常称为参数（parameter）。如果你不希望一个函数接受参数，则可省略形参。例如：
如果你不希望函数返回一个结果，可将其返回类型设置为void。例如：
这里，void的意思是“不返回一个值”或“什么也不返回”。
在函数声明和定义中，你可以为参数命名也可以不命名，完全取决于你的需要。例如：
在函数声明中，形参的名字不是必需的，只是对于编写好的注释很有益处。以编译器的观点，第二个my_find（）声明与第一个一样好：它包含所有调用my_find（）所需的信息。 ...
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