什么是“ EXIT_FAILURE”类？

Question

In the main function, I had a lot of error testing code to make sure I successfully located and opened some files. So since I did that a lot, I made it a separate, void, function. When I previously had "return EXIT_FAILURE" in the main function it would work just like I wanted it to. But when I put it in a secondary function I named errorTest, it gets on me about returning something after declaring it a void function. So, what class is "EXIT_FAILURE", so I can differently declare that void function into returning whatever class "EXIT_FAILURE" is?

(and yes, I included the library cstdlib)

Answer 1

It's a preprocessor macro defined by #include <cstdlib> .

It expands to an integral constant expression. This is not necessarily of type int , however it must have a value within the valid range of int so that it can be passed to exit() .

Answer 2

it's an integer. Declare your function as int.

Answer 3

EXIT_FAILURE是在stdlib.h （或cstdlib ）中声明的int ，因此它是原始类型，而不是类。

Answer 4

EXIT_SUCCESS和EXIT_FAILURE是在stdlib.h或cstdlib定义的宏。