虛基類的簡單應用【C++程序設計】

C++編譯系統只執行最後的派生類對虛基類的構造函數的調用，而忽略虛基類的其他派生類對虛基類的構造函數的調用，這就保證了虛基類的數據成員不會被多次初始化。

/*多重繼承派生類-虛基類*/
#include <iostream>
#include <string>
#include <iomanip>
using  namespace std;
class Person//基類-人
{
public:
	Person(int nian, string xing)//帶參數構造函數，nian-年齡，xing-性別
	{
		age = nian;
		sex = xing;
	}
protected:
	int age;
	string sex;
};

class Teacher:virtual public Person//派生類-老師
{
public:
	Teacher(int nian, string xing, int bianhao, string zhichen) :Person(nian, xing)
	{
		num = bianhao;
		titl = zhichen;
	}
protected:
	int num;
	string titl;
};
class Student:virtual public Person//派生類-學生
{
public:
	Student(int nian, string xing, int fenshu) :Person(nian, xing)
	{
		sorce = fenshu;
	}
protected:
	int sorce;
};

class Graduate:public Teacher,public Student//派生類-在職研究生
{
public:
	Graduate(int nian, string xing,int bianhao,string zhichen,int fenshu, int jintie) :Person(nian, xing), Teacher(nian, xing,bianhao, zhichen), Student(nian,xing,fenshu), wage(jintie){}
	void print();
private:
	int wage;
	
};
void Graduate::print()
{
	cout << age << setw(10) << sex << setw(10) << num << setw(10) << titl << setw(10)<< sorce << setw(10) << wage << setw(10) << endl;
}
int main()//主函數
{
	Graduate zhou(25,"man",2018,"xuesheng",99,500);//初始化
	zhou.print();
	system("pause");
	return 0;
}