若有以下程序:
#include <iostream>
using namespaces std;
class A
public:
A ()
A (int i)
x1=i;
void dispa()
cout<<"xl="<<xl<<" , ";
private:
int x1;
;
class B : public A
public:
B ()
B (int i):A(i+10)
x2=i;
void dispb()
dispa ();
cout <<"x2="<<x2<<end1;
private:
int x2;
;
int main ()
B b(2);
b.dispb ():
return 0;
程序运行后的输出结果是( )。
A.x1=10,x2=2
B.x1=12,x2=10
C.x1=12,x2=2
D.x1=2,x2=2