在某本书上的一个例子,可我编译却不能通过,请教高手指点! #include<iostream> using namespace std;

class OpOverClass { friend ostream& operator<< (ostream&, const OpOverClass&); friend istream& operator>> (istream&, OpOverClass&);

public: OpOverClass (int i = 0, int j = 0);

private: int a; int b; };

ostream& operator << (ostream& osObject, const OpOverClass& right) { osObject << "(" << right.a << ", " << right.b << ")";

return osObject; }

istream& operator >> (istream& isObject, OpOverClass& right) { isObject >> right.a >> right.b;

return isObject; }

OpOverClass::OpOverClass (int i, int j) { a = i; b = j; }

int main () { OpOverClass u (23, 45); OpOverClass v; cout << "u = " << u << endl;

cout << "Enter two integers: "; cin >> v; cout << "v = " << v << endl;

return 0; }

#include&lt;iostream&gt;
using namespace std;
=======================
改成
#include&lt;iostream.h&gt;

谢谢回复!
可是这是什么原因呢?

我也不知道~我也遇到这个问题~后来改成那样就正常了