C++ define function syntax with rand

Question

I am working on a class assignment with starter code and included is this syntax that I've never seen before.

#define EVENT() (rand() % 2 > 0.5)

Can someone tell me what this does? Does it return something? I know the define is a macro that has a function called EVENT(), but what does the (rand() % 2 > 0.5) bit mean? If I use EVENT() in the code somewhere, do I treat it as a void function that just evaluates to that statement?

Answer 1

无论在源代码中使用EVENT（）的哪个位置，预处理器都将EVENT（）替换为rand（）％2> 0.5，这将返回随机数1或0，如果rand（）结果为奇数则返回1，如果结果为偶数则返回0 。