有个问题一直困扰我

Question

经常看到代码中有 |\ 的标记，但是一直没明白是什么意思
比如：
#define WS_OVERLAPPEDWINDOW (WS_OVERLAPPED     | \
                             WS_CAPTION        | \
                             WS_SYSMENU        | \
                             WS_THICKFRAME     | \
                             WS_MINIMIZEBOX    | \
                             WS_MAXIMIZEBOX)| \在这里是什么意思啊？

Answer 1

你的代码等效于
#define WS_OVERLAPPEDWINDOW (WS_OVERLAPPED|WS_CAPTION|WS_SYSMENU|WS_THICKFRAME|WS_MINIMIZEBOX|WS_MAXIMIZEBOX)
不用再解释了吧

Answer 2

但是为什么不这样写呢？
#define WS_OVERLAPPEDWINDOW (WS_OVERLAPPED    |  
                            WS_CAPTION        |  
                            WS_SYSMENU        |  
                            WS_THICKFRAME    | 
                            WS_MINIMIZEBOX    | 
                            WS_MAXIMIZEBOX)