chenkangli的专栏

// Test.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include class A;class B{public: void print_a(A&);};class A{public: A(int I):i(I){}private: friend void B::print_

class rational{public: rational(int numerator=1,int demominator=1); rational(const rational&); int GetNumerator() const; int GetDemominator() const; void PrintRational() const; void SetNumerator(int n