【C10】
A. business
B. commercial
C. trading
D. exchanging
已知类A中有公用数据成员B*b;其中B为类名。则下列语句错误的是
A():d(new B){}
B. A(const A &oo):d(newr B){*d=*oo.d;}
C. ~A(d){}
D. ~A(){delete d;}
【C8】
A. popular
B. distinct
C. ordinary
D. widespread
执行下列程序的结果是main(){float x=1,y;y=++x*++x;cout<<y<<endl;}
A. 9.000000
B. 6.000000
C. 1.000000
D. 程序有错误