这两个有什么区别啊，各有什么优点啊，
我在我的书上没有找到，请帮忙解释一下

#include <iostream.h>

does not work for modern compliers, e.g., VS 2005. It may work for VS6, or older compilers.

The standard way is

#include <iostream>
using namespace std;

HJin Think you very much

only two different standard；
iostream.h is the old one;

#include <iostream>
using namespace std;
is the new one;