无效美孚（无效）;
 

这是说，在C没有参数的正确的方法，而且它也适用于C ++。

不过：

 无效美孚（）;
 

意味着C和C ++不同的事情！在C语言中的意思是可以采取任何数量的未知类型参数，并在C ++中它的意思一样富（无效）。

变量参数列表功能，本质上是未类型安全，应尽量避免使用。

What is better: void foo() or void foo(void)? With void it looks ugly and inconsistent, but I've been told that it is good. Is this true?

Edit: I know some old compilers do weird things, but if I'm using just GCC, is void foo() Ok? Will foo(bar); then be accepted?

void foo(void);

That is the correct way to say "no parameters" in C, and it also works in C++.

But:

void foo();

Means different things in C and C++! In C it means "could take any number of parameters of unknown types", and in C++ it means the same as foo(void).

Variable argument list functions are inherently un-typesafe and should be avoided where possible.