proj10_07.cpp

来自「C++程序设计教程的全部源代码 包含与教程同步的PPT 方便学习」· C++ 代码 · 共 26 行

#include <iostream.h>
class A
{
public:
    A(){a = 1;} 				// 默认初值a=1
    int a;
};
class B : public A
{
public:
    B(){a = 4;} 						// 默认初值a=4;
    void print(){cout << a << "\n";}	/* 此为class B的private成员a */
private:
    int a;
};
void main()
{
	B obj1;
	cout << sizeof(A) << " " << sizeof(B) << "\n";
	//cout << obj1.a << "\n";		//无法存取!存取class B的private成员a
	cout << obj1.A::a << "\n";
	obj1.print();
}