C++_day3：构造函数、析构函数、拷贝构造函数-编程知识

C++_day3：构造函数、析构函数、拷贝构造函数

1.设计一个Per类，类中包含私有成员:姓名、年龄、指针成员身高、体重，再设计一个Stu类，类中包含私有成员:成绩、Per类对象p1，设计这两个类的构造函数、析构函数和拷贝构造函数。

程序代码：

#include <iostream>using namespace std;//封装一个Per类
class Per
{
private://私有成员string name;//姓名int age;//年龄double *height;//指针成员身高double *weight;//指针成员体重
public://公共成员//一、构造函数//1.无参构造函数Per(){cout << "无参构造函数" << endl;}//2.有参构造函数//初始化列表Per(string name,int age,double height,double weight):name(name),age(age),height(new double(height)),weight(new double(weight)){cout << "有参构造函数" << endl;}//二、拷贝构造函数Per(const Per &other):name(other.name),age(other.age),height(new double(*(other.height))),weight(new double(*(other.weight))){cout << "拷贝构造函数" << endl;}//三、析构函数~Per(){cout << "析构函数" << endl;}//输入数据成员值void show(){cout << "姓名：" << name << endl;cout << "年龄：" << age <<endl;cout << "身高：" << height << endl;cout << "体重：" << weight << endl;}
};
//封装一个名为Stu的类
class Stu
{
private://私有成员double score;//成绩Per p1;//Per类对象p1
public://公共成员//一：构造函数//1.无参构造函数Stu(){cout << "Stu::无参构造函数" << endl;}//2.有参构造函数Stu(double score,string name,int age,double height,double weight):score(score),p1(name,age,height,weight){cout << "Stu::有参构造函数" << endl;}//二.拷贝构造函数Stu(const Stu &other):score(other.score),p1(other.p1){cout << "Stu::拷贝构造函数" << endl;}//三、析构函数~Stu(){cout << "Stu::析构函数" << endl;}void show(){cout << "score = " << score << endl;}};
int main()
{Per p;//系统自动调用无参函数//用Per这样的类 实例化一个p1对象Per p1("张三",25,165,152); //自动调用有参构造函数Per p2(p1);//调用拷贝构造函数Stu s1; //自动调用无参构造函数Stu类Stu s2(80,"李四",26,160,155);//自动调用有参构造函数Stu s3(s2);//自动调用拷贝构造函数return 0;
}

运行结果：