C++中头文件的编写方法
头文件(.h)：
写类的声明（包括类里面的成员和方法的声明）、函数原型、#define常数等，但一般来说不写出具体的实现。
在写头文件时需要注意，在开头和结尾处必须按照如下样式加上预编译语句（如下）：
＃ifndef NAME_H
#define NAME_H
// YOUR CODE
#endif
#define NAME_H
// YOUR CODE
#endif
Warning: Control reaches end of non-void function
Warning: Control reaches end of non-void function--Reason and Solution The reason for this warning is that the compiler thinks your function may never return something at the end of the function, though you are 100% sure that it can return what you expect. The solution is simple, just add a statement returning something at the end of you function body. And the warning or error will disappear. UPDATE! Last time I said that the solution the the problem is to add a expression "return 0;" to the end of the function. However, when I was having class, our teacher gave us a better solution! That is: REMOVE THE ELSE SENTENCE ! If the condition is satisfied, the following expression will be executed and an integer will be returned. If the condition is not satisfied, directly return a -1 and the function is ended. Here is the demonstration: This way is succinct and more logical. But it seems it can't be applied in the first example. ...
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