《面向对象程序设计C++》期末试卷(A)标准答案 - 副本

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1、（面向对象A卷答案）1-5．CDBCC　6-10．AADDB11-15．ABBBC　16-20．DCBCC1．抽象实例2．this指针3．ED、FA、B、C、D、ED、F4．virtual5．静态多态性动态多态性6.抽象类7.friendvoidfun(A&a)8.继承组合或模板9.在对象被系统释放之前做一些内存清理工作10.A(constA&)11.Aoperator++(int)1、a=89,b=56,c=122、ABC3、A::A()called.B::B()called.B::~B()called.A:

2、:~A()called.4、CallB'sfunctionf()CallB'sfunctiong()CallC'sfunctiong()1、（10分）Complex::Complex(){real=0;imag=0;}Complex::Complex(doubler){real=r;}Complex::Complex(doubler,doublei){real=r;imag=i;}Complexoperator+(Complex&c1,Complex&c2){Complexc;c.real=c1.real+c2

3、.real;c.imag=c1.imag+c2.imag;returnc;第3页}ostream&operator<<(ostream&output,Complex&c){output<<"("<>(istream&input,Complex&c){cout<<"inputrealandimaginarypartofcomplexnumber:";input>>c.real>>c.im

4、ag;returninput;}2、（17分）classCircle:publicShape{public:Circle(doubler){radius=r;}voidset(){cout<<"Pleaseinputthevalueofthecircle:"<>radius;}voidshow(){cout<<"theradiusofthecircle="<

5、bleradius;};classSquare:publicShape{public:Square(doublea){this->a=a;}voidset(){cout<<"Pleaseinputthevalueofa:"<>a;}voidshow()第3页{cout<<"a="<

6、hape*s[]={&C,&S};cout<<"total="<