有如下程序: #include <iostream.h> #include <iomanip.h> using namespace 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)<<xa.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.88
B.****88
C.****8****8
D.8****8