demo_constructor_08.cpp

对于一个初涉VC＋＋的人来书

//***************************************************

# include <iostream.h>
# include <string.h>

class StudentID
{
public:
	StudentID(int id=0)
	{
		value=id;
		cout<<"Assigning student id "<<value<<endl;
	}
	~StudentID()
	{
		cout<<"Destructing id "<<value<<endl;
	}

protected:
	int value;
};

class Student
{
public:
	Student(char* pName="noName",int sID=0)
	{
		cout<<"Constructing student: "<<pName<<endl;
		strncpy(name,pName,sizeof(name));
		name[sizeof(name)-1]='\0';
//		StudentID id(sID);  //类定义中不允许创建对象语句
	}

protected:
	char name[20];
	StudentID id;
};

void main()
{
	Student s("Jenny",9818);
}

/*
Assigning student id 0
Constructing student: Jenny
Assigning student id 9818
Destructing id 9818
Destructing id 0
Press any key to continue
*/