下列程序的输出结果是【】。 include using namespace std; class A {int a; public:A() 下列程序的输出结果是【 】。include <iostream>using namespace std;class A {int a;public:A():a(9){}virtual void print() const { cout<<a;};};class B: public A {char b;public:B( ){b='S';}void print() const {cout<<b;}};void show(A x){ x.print0;}int main(){ Ad1,*p;B d2;p=d2;d1.print();d2.print0;p->print();show(d1);show(d2);return 0;}
下列程序的输出结果是【】。 include using namespace std; class A {int a; public:A()
下列程序的输出结果是【 】。
include <iostream>
using namespace std;
class A {
int a;
public:
A():a(9){}
virtual void print() const { cout<<a;};
};
class B: public A {
char b;
public:
B( ){b='S';}
void print() const {cout<<b;}
};
void show(A &x){ x.print0;}
int main()
{ Ad1,*p;
B d2;
p=&d2;
d1.print();
d2.print0;
p->print();
show(d1);
show(d2);
return 0;}
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