友元函数实例

//非成员函数作为友元函数
#include
using namespace std;
class Student
{
public:
Student(char N[],int A);
friend void disp(Student &);
private:
int Score;
char name[30];
};
Student::Student(char N[],int A)
{
strcpy(name,N);
Score=A;
}
void disp(Student &s)
{
cout<<"Student is:"<}
void main()
{
Student s1("LiLei",85);
Student s2("Wang",90);
disp(s1);
disp(s2);
}



//一个类的成员函数作为另一个类的友元函数
#include
using namespace std;
class Boy;
class Girl
{
public:
Girl(char N[],int A)
{strcpy(name,N);Score=A;}
void disp(Boy &);
private:
char name[30];
int Score;
};
class Boy
{
public:
Boy(char N[], int A)
{strcpy(name,N);Score=A;}
friend void Girl::disp(Boy &);
private:
char name[30];
int Score;
};
void Girl::disp(Boy &b)
{
cout<<"Girl is:"<cout<<"Boy is:"<}
void main()
{
Girl g("John",70);
Boy b("Jim",85);
g.disp(b);
}