C++ 引用/指针/对象名调用

示例

#include <iostream>

using namespace std;

class Kid
{
private:
int age;
char*name;
char*sex;
public:
        Kid(int age,char*name,char*sex);
        Kid(const Kid &kid);  //自定义拷贝函数
~Kid(); 
void showKid();
};


Kid::Kid(int age,char*name,char*sex)
{
    Kid::age=age;
    Kid::name=new char[strlen(name)+1];
    strcpy(Kid::name,name);
    Kid::sex=new char[strlen(sex)+1];
    strcpy(Kid::sex,sex);
}

//Kid::Kid(int age,char *name,char *sex):age(age),name(name),sex(sex) //用成员初始化表对数据成员初始化
//{
//
//}

Kid::Kid(const Kid &kid)
{
    Kid::age=kid.age*2;
    int c=strlen(kid.name)+1;//一定要+1用来存放‘/0’字符串结束标志，否则会内存溢出
    Kid::name=new char[c];
    strcpy(Kid::name,kid.name);
    Kid::sex=new char[strlen(kid.sex)+1];
    strcpy(Kid::sex,kid.sex);
}

Kid::~Kid() //自定义析构函数
{

    delete []Kid::name; //delete运算符释放存储空间
    delete []Kid::sex;
    cout<<"dispose object kid"<<Kid::age<<endl;
}

void Kid::showKid()
{
    cout<<"孩子:"<<endl<<"姓名："<<name<<endl<<"年龄："<<age<<endl<<"性别："<<sex<<endl;
}

class Car
{    
public:
char*no;
char*brand;
int speed;
void showCar();
~Car();//仿默认析构
};

Car::~Car()
{
     cout<<"dispose object car"<<endl;
}


void Car::showCar()
{
    cout<<"汽车:"<<endl<<"号码："<<no<<endl<<"品牌："<<brand<<endl<<"速度："<<speed<<"km/h"<<endl;
}

int main()
{
    Kid kid(10,"rookie_j","男");
    kid.showKid();

    cout<<"--------------------"<<endl;

    Kid kid2(kid); //代入法调用拷贝构造函数
    kid2.showKid();

    cout<<"--------------------"<<endl;

    Kid kid3=kid2; //赋值法调用拷贝构造函数
    kid3.showKid();

    cout<<"--------------------"<<endl;

    Kid *ptr=new Kid(10,"rookie_x","女"); //使用new运算符动态创建对象
    ptr->showKid();

    cout<<"--------------------"<<endl;

delete ptr; //释放对象所占的存储空间

    Car car={"8888888","Benz",200},car2;//只有没定义构造函数的类，才能用初始值表初始化公有数据成员，默认构造
    car.showCar();


    cout<<"--------------------"<<endl;

    car2=car;//默认拷贝构造函数或car2(car)
    car2.showCar();

    cout<<"--------------------"<<endl;

return 0;
}

运行结果：

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