所谓组合类便是一个类中含有其他类的对象:

#include <iostream>
#include <string.h>
using namespace std;class dog
{
public:dog() {}dog(const char *n, int age, const char *v) : age(age){strcpy(this->name, n);strcpy(this->var, v);}// 显示这条狗void show_dog(){cout << "狗名:" << name << " 年龄:" << age << " 品种:" << var << endl;}private:char name[1024];int age;char var[1024];
};class person
{
public:person(const char *n, int age, dog d) : d(d), age(age){strcpy(this->name, n);}// 显示人的信息void show_person(){cout << "姓名:" << name << " 年龄:" << age << endl;// 显示这个人养的狗d.show_dog();}private:char name[1024];int age;// 这个人养了一条狗dog d;
};int main()
{                      // dog("旺财", 1, "土狗") 调用dog类的构造函数person xm("小明", 18, dog("旺财", 1, "土狗")); //???? 狗呢？？xm.show_person();
}