c语言中对于空函数列表的问题
看下面这段程序：
#include <stdio.h>
int f1()
{
return 0;
}
int f2(void)
{
return 0;
}
int main()
{
f1(3.);
//f2(3.);//如果去掉这一行的注释，编译会报错 error: too many arguments to function ‘f2’
return 0;
}对于f2，没什么好说的，void就说明不能有参数，强行给参数调用肯定会报错。
但是对于f1，居然可以加参数调用？
在gcc下似乎没有报错提示，在clang会报warning。
gcc下如果加-Wstrict-prototypes的话，也会报warning
关于这个问题，我在网上搜，stackoverflow上面有一些很好的回答
在c99的标准中，有这样一段话：
An empty list in a function declarator that is part of a definition of that function specifies that the function has no parameters.
c99标准文档见 http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1256.pdf
因此从标准上来看，这个操作是未定义的。只不过目前大多数编译器（gcc,clang,其他的我没测试过）为了保证对旧代码的兼容性，会允许这个特性。
还有以下几个相关问题里面的回答也很好：
https://stackoverflow.com/questions/51032/is-there-a-difference-between-foovoid-and-foo-in-c-or-c
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