自考新教材-p228

源程序：

#include<iostream>
#include<string>
using namespace std;

class B;
class A
{
public:
int aInt;
B *bPoint = NULL;
void SetValue(int v)
{
aInt = v;
}
};

class B
{
public:
A aCla;
int bInt;
void SetValue(int v)
{
bInt = v;
}
};

int main()
{
A ca;
B cb;
ca.bPoint = &cb;
cout << "ca.bPoint=" << ca.bPoint << endl;
cout << "cb Addr=" << &cb << endl;
cout << "ca.aInt=" << ca.aInt << endl;
cout << "cb.aCla.aInt=" << cb.aCla.aInt << endl;
cout << "cb.bInt=" << cb.bInt << endl;
cout << "分界线" << endl;
ca.SetValue(10);
cb.SetValue(20);
cb.aCla = ca;
cout << "ca.bPoint=" << ca.bPoint << endl;
cout << "ca.aInt=" << ca.aInt << endl;
cout << "cb.aCla.aInt=" << cb.aCla.aInt << endl;
cout << "cb.bInt=" << cb.bInt << endl;
system("pause");
return 0;
}

运行结果：