4-5.txt

思路很清晰的c++课件。例子很简明

#include <iostream.h>
class base{
protected:
	int a,b;
public:
	void setab(int n,int m){a=n;b=m;}
};

class derive:public base{
	int c;
public: 
	void setc(int n){c=n;}
	void showabc()
	{  cout<<a<<' '<<b<<' '<<c<<endl; }
};

void main()
{	derive obj;
	obj.setab(2,4);
	obj.setc(3);
	obj.showabc();
}