有如下程序:#include ＜iostream＞#include ＜iomanip＞using nanespace std;class CSum int x,y; public: CSum (int x0,int y0):x(x0),y(y0) friend ostream & operator＜＜(ostream& os, const CSum& xa) os＜＜setw(5)＜＜x
A．x+xa.y;
return os;
;
int main()
CSum y(3,5);
cout＜＜setfill(’*’)＜＜8;
cout＜＜y;
return 0;
执行上面程序的输出是( )。A. 88B. ****88C. ****8****8D. 8****8