面向对象c++习题参考解答

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1、4-8定义一个Dog类，包含age,weight等属性，以及对这些属性操作的方法。实现并测试这个类。#includeusingnamespacestd;classDog{public:voidsetAge(inta){age=a;}intgetAge(){returnage;}voidsetWeight(floatw){weight=w;}floatgetWeight(){returnweight;}private:intage;floatweight;};voidmain(){Dogd;d.setAge(3);d.setWeight(30);cout<<"小狗："

2、<#includeusingnamespacestd;classRectangle{public:Rectangle(intxx1,intyy1,intxx2,intyy2){x1=xx1;y1=yy1;x2=xx2;y2=yy2;}floatgetArea(){returnfabs(x2-x1)*fabs(y2-y1);}

3、private:intx1,y1;intx2,y2;};voidmain(){Rectanglerec(0,0,10,20);cout<<"矩形面积："<usingnamespacestd;classRectangle{public:Rectangle(intl,intw){length=l;width=w;}floatgetArea(){returnlength*width;}private:intlength;intwidth;}

4、;voidmain(){Rectanglerec(10,20);cout<<"矩形面积："<usingnamespacestd;constfloatPI=3.1415;classCircle{public:Circle(floatr){radius=r;}floatgetArea(){returnradius*PI*PI;}private:floatradius;};

5、voidmain(){Circlec(5.5);cout<<"圆的面积："<usingnamespacestd;classComplex{public:Complex(floatr=0.0,floati=0.0){real=r;image=i;}voidadd(Complexb){real=real+b.real;image=imag

6、e+b.image;}voidshow(){cout<

7、am>usingnamespacestd;classCat{public:Cat(){numOfCats++;}~Cat(){numOfCats--;}staticintgetNumOfCats(){returnnumOfCats;}private:staticintnumOfCats;};intCat::numOfCats=0;voidmain(){cout<<"现在的Cat数量："<