杭州电子科技大学C面向对象程序设计期末考试试题(A)卷.doc

****题二、选择题(20分)。..,则______________参数就作为这一参数。,条件是它不访问__________类成员。。。++中,混合类型表达式_____________。(intVar)也可表示为_______________。=long;(long)c.(long)。,请使用__________________。:、写出下面程序的执行结果:(15分)1)#include<iostream>usingnamespacestd;classA{frienddoublecount(A&);public:A(doublet,doubler):total(t),rate(r){}private: doubletotal;doublerate;};doublecount(A&a){+=*;;}intmain(void){ Ax(80,),y(100,); cout<<count(x)<<','<<count(y)<<'\n'; cout<<count(x)<<'\n'; return0;}执行结果:2)#include<iostream>usingnamespacestd;classCount{private:staticintcounter;intobj_id;public:Count();//constructorstaticvoiddisplay_total();//staticfunctionvoiddisplay();~Count();//destructor};intCount::counter;//definitionofstaticdatamemberCount::Count()//constructor{counter++;obj_id=counter;}Count::~Count()//destructor{counter--;cout<<"Objectnumber"<<obj_id<<"beingdestroyed\n";}voidCount::display_total()//staticfunction{cout<<"Num