派生类的构造函数、对象的初始化_派生类构造函数,仅对派生类的新增数据成员初始化传递参数;-优快云博客

本文通过一个C++程序示例介绍了类的继承和成员函数的应用，包括如何在一个派生类中使用基类的成员，并展示了如何创建对象及调用其成员函数来显示学生信息。

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

class Student
{
public:
	Student(int a, string b):num(a),name(b){};
	void display();
protected:
	int num;
	string name;


};
void Student :: display()
{
	cout<<"num:"<<num<<endl<<"name:"<<name<<endl;
}

<span style="BACKGROUND-COLOR: #ff9900">class Student1:public Student
</span>{
	private:
	Student monitor;
	int age;
	string addr;
	
	public:
	<span style="BACKGROUND-COLOR: #ff9966">Student1(int a , string b, int num1, string name1, int ag, string ad):Student(a,b),monitor(num1,name1)
</span>	{
		age = ag;
		addr = ad;
	}
	void show();
	void show_monitor();

};
void Student1::show()
{
	cout<<"This student is:"<<endl;
	display();           //public函数调用另一个public函数
	cout<<"age:"<<age<<endl;
	cout<<"address:"<<addr<<endl;
}
void Student1::show_monitor()
{
	cout<<"The monitor is:"<<endl;
	monitor.display();   //public函数调用子对象的public函数
}

int main()
{
	
	<span style="BACKGROUND-COLOR: #ff9900">Student1 *stud1 ;
</span>	<span style="color:#000000;BACKGROUND-COLOR: #ff9900">stud1= new Student1(101,"wang",105,"sun",19,"Beijing");
</span>	Student1 *stud2;
	stud2 = new Student1(110,"li",200,"qiang",19,"Nanjing");
	stud1->show();
	stud1->show_monitor();
	stud2->show();
	stud2->show_monitor();

	getchar();
	delete stud2;
	delete stud1;
	return 0;
	
	
}