问题 问答题

在下面程序横线处填上适当的语句,使其输出结果为0,15,15。
#include<iostream.h>
class base
public:
______f()return 0;

class derived:public base
public:
int a,b,c;
______set(int x,int y,int z)a=x;b=y;c=z;
int f()return a+b+c;

void main()
base b;
derived d;
cout<<b.f()<<",";
d.set(3,5,7);
cout<<d.f()<<",";
base &p=d;
cout<<p.f()<<endl;

答案

参考答案:virtual int
void

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