C++程序设计案例教程试卷B答案.docx

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1、C+程序设计实例教程期末考试试卷(B)标准答案一、单项选择题1-5DAC AD6-10 DBCDC11-15DCB DB16-20 ADCCC二、填空题1. 抽象、实例public、 private、 protecled 、 private2. virtual 4. friend void fun(A &a)5. 静态数据成员、静态成员函数 6. 结合性 、优先级一7. Template class (或 typename) 8. 类 、 结构体在创建对象时初始化对象的数据成员9. A operator+(int)三、阅读下面3个程序，写出程序运行时输出的结果1、a=89,b=56,c=122

2、、12/31/200912/31/20091/1/20101/1/20103、constructing Aconstructing Bconstructing Cdestructing Cdestructing Bdestructing A四、编程题1、 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 &cl,Complex &c2) Complex c;c.re

3、al=cl.real+c2.real; c.imag=cl.imag+c2.imag;return c;)ostream& operator (ostream& output,Complex& c) output,(Hc.real+c.imagi)endl;return output;)istrcam& operator (istrcam& input,Complcx& c) coutinput real and imaginary part of complex number:u;inputc.realc.imag;return input;12、class Circle:public Sh

4、apepublic:Circle(double r)radius=r;void set() coutPlease input the value of the circle:,endl;cinradius;void show() coutHthe radius of the circle=radiusendl; double area() return 3.14159*radius*radius;private:double radius;I；class Square:public Shapepublic:Square(double a)this-a=a;)void set() coutPlease input the value of a:endl;cina;)void show() cout,a=,aendl; double area() return a*a;)private:double a;1；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;