c++学习记录(六)

c++类继承实践

1.实践预想：子类中调用基类的public、private、protected成员函数

2.代码展示：

#include<iostream>
using namespace std;
class Try
{
public:
	Try()
	{
		cout << "测试友元函数以及构造、析构函数使用" << endl;
		length = 0;
		height = 0;
		weight = 0;
	}

	~Try()
	{
		cout << "测试结束" << endl;
	}

	friend void print(Try try2);


	void print2()
	{
		length += 5;
		weight += 3;
		height += 6;
		cout << "长宽高之积:" << length * height * weight << endl;
	}
	
private:
	void print3()
	{
		length += 5;
		weight += 3;
		height += 6;
		cout << "长宽高之积:" << length * height * weight << endl;
	}
	
protected:
	void print4()
	{
		length += 5;
		weight += 3;
		height += 6;
		cout << "长宽高之积:" << length * height * weight << endl;
	}

	int length;
	int height;
	int weight;
};

void print(Try try2)
{
	try2.length += 5;
	try2.weight += 3;
	try2.height += 6;
	cout << "长宽高之积:" << try2.length * try2.height * try2.weight << endl;
}

class Stry:public Try
{
	public:
		int print5()
		{
			cout<<"长宽高之和："<<length+weight+height<<endl;
		}
};

int main()
{
	Stry abc;
}