单项选择题

下列程序段的输出结果是
#include<iostream.h>
void fun(int*x,int*y)
{cout<<*x<<*y;
*X=3;
*y=4;

void main()
{int x=1,y=2;
fun(&y,&x);
cout<<X<<y<<endl;

A.2143
B.1212
C.1234
D.2112