在下面程序横线处填上适当的字句，使其输出结果为0，56，56。
＃include
class base{
public:
在下面程序横线处填上适当的字句，使其输出结果为0，56，56。
＃include
class base{
public:
_________func( ){return 0;}
};
class derived:public base{
public:
int a,b,c;
_________ setValue(int x,int y,int z){a=x;b=y;c=z;}
int func( ){return(a+b)*c;}
};
void main()
{
base b;
derived d;
cout<
d.setValue(3,5,7);
cout<
base& pb=d;
cout<
}
func( ){return 0;}
};
class derived:public base{
public:
int a,b,c;
_________ setValue(int x,int y,int z){a=x;b=y;c=z;}
int func( ){return(a+b)*c;}
};
void main()
{
base b;
derived d;
cout<
d.setValue(3,5,7);
cout<
base& pb=d;
cout<
}
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