简单的C++题.docVIP

/*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*/ #includeiostream using namespace std; class Dog { public: Dog(int a,int b) { age=a; weight=b; } ~Dog(){} int getAge() { return age; } int getWeight() { return weight; } void setAge(int age) { this-age=age; } void setWeight(int weight) { this-weight=weight; } private: int age,weight; }; int main() { Dog jack(2,10); coutjack is a Dog who is ; coutjack.getAge() years old and jack.getWeight() pounds weightendl; jack.setAge(7); jack.setWeight(20); coutNow jack is ; coutjack.getAge() years old and jack.getWeight() pounds weightendl; return 0; } /*定义一个Circle类，有数据成员radius(半径)成员函数getArea(),计算圆的面积，构造一个 Circle的对象进行测试。*/ #includeiostream using namespace std; class Circle { public: Circle(float radius) { this-radius=radius; } ~Circle(){} float getArea() { return 3.14*radius*radius; } private: float radius; }; int main() { float radius; cout请输入圆的半径：; cinradius; Circle p(radius); cout半径为radius的圆的面积为：p.getArea()endl; return 0; } /*定义一个Tree(树)类，有成员ages（树龄）， 成员函数grow（int years）对ages加上years， age（）显示tree对象的ages值。*/ #includeiostream using namespace std; class Tree { public: Tree(int ages=0) { this-ages=ages; } ~Tree(){show();} void grow(int years) { ages+=years; } void show() { cout树的年龄为：agesendl; } private: int ages; }; int main() { Tree e1(10); e1.show(); e1.grow(5); return 0; } /*定义一个复数类Complex，使得下面的代码能够工作 Complex c1(3,5); //用复数3+5i初始化c1 Complex c2=4.5; //用实数4.5初始化c2 c1.add(c2); //将c1与c2想加，结果保存在c1中 c1.show(); //将c1输出(这时的结果应该是7.5+5i)*/ #includeiostream using namespace std; class Complex { public: Complex(double r,double i) { real=r; image=i; } Complex(double r) { real=r; image=0; } void show() { coutreal+; coutimagei; coutendl; } void add(Complex c2) { real+=c2.real; image+=c2.image; } private: dou