若有以下程序:
#include <iostream>
using namespace std;
class Base
private:
int a,b;
public:
Base(int x, int y)
a=x;
b=y;
void disp ()
cout<<a<<" "<<b<<end1;
;
class Derived : public Base
private:
int c;
int d;
public:
Derived(int x,int y, int z,int m) :Base(x,y)
c=z;
d=m;
void disp ()
cout<<c<<" "<<d<<end1;
;
int main()
Base b(5,5),*pb;
Derived obj(1,2,3,4);
pb=&obj;
pb->disp();
return 0;
执行程序后的输出结果是( )。
A.1,2
B.3,4
C.2,3
D.5,5