《面向对象程序设计C++》期末试卷(A)标准答案副本.docVIP

（面向对象A卷答案）1-5．C D B C C　 6-10．A A D D B11-15． B B C　 6-20．this指针 3． E D、F A、B、C、D、E D、F 4． virtual 5． 静态多态性 动态多态性 6. 抽象类 7. friend void fun(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(const A) 11. A operator++(int) 1、a=89,b=56,c=12 2、ABC 3、A::A() called. B::B() called. B::~B() called. A::~A() called.Call Bs function f() Call Bs function g() Call Cs function g() 1、（10分） Complex::Complex(){real=0;imag=0;} Complex::Complex(double r){real=r;} Complex::Complex(double r,double i){real=r;imag=i;} Complex operator+(Complex c1,Complex c2) { Complex c; c.real=c1.real+c2.real; c.imag=c1.imag+c2.imag; return c; } ostream operator (ostream output,Complex c) { output(c.real+c.imagi)endl; return output; } istream operator (istream input,Complex c) { coutinput real and imaginary part of complex number:; inputc.realc.imag; return input; } 2、（17分） class Circle:public Shape {public: Circle(double r){radius=r;} void set() { coutPlease input the value of the circle:endl; cinradius; } void show() { coutthe radius of the circle=radiusendl; } double area() {return 3.14159*radius*radius;} private: double radius; }; class Square:public Shape {public: Square(double a){this-a=a;} void set() { coutPlease input the value of a:endl; cina; } void show() { couta=aendl; } double area(){return a*a;} private: double a; }; int main() { Circle C(5.5); C.show(); Square S(9.9); S.show(); Shape *s[]={C,S}; couttotal=total(s,2)endl; return 0;} 1 第 3 页