简单的C++题.doc

/*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*/#includeusing namespace std;class Dogpublic: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。*/#includeusing namespace std;class Circlepublic:Circle(float radius)this-radius=radius;Circle()float getArea()return 3.14*radius*radius;private:float radius;int main()float radius;coutradius;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。*/#includeusing namespace std;class Treepublic: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c1Complex c2=4.5; /用实数4.5初始化c2c1.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)*/#includeusing namespace std;class Complexpublic: 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: double real;double image;int main() Complex c1(3,5); Complex c2(4.5); c1.show(); c1.add(c2); c1.show(); return 0;/*定义一个Cat类，拥有静态数据成员numOfCats记录Cat的个体数目，静态成员函数getNumOfCats()存取numOfCats,设计程序测试这个类，体会静态数据成员和静态成员函数的用法。*/#includeusing namespace std;class Catpublic:Cat(int age)itsAge=age;numOfCats+;virtual Cat()numOfCats-;virtual int getAge()return itsAge; virtual void setAge(int age)itsAge=age; static int getNumOfCats()return numOfCats;private:int itsAge;static int numOfCats;int Cat:numOfCats=0;void telepathicFunction()coutThere are Cat:getNumOfCats()cats alive !n;int main()const int maxCats=5;Cat*catHousemaxCats;int i;for(i=0;imaxCats;i+)catHousei=new Cat(i);telepathicFunction();for(i=0;imaxCats;i+)delete catHousei;telepathicFunction();return 0;/*在函数fn1()中定义一个静态变量nfn1()中对n的值加1，在主函数中，调用fn1()10次,显示n的值。*/#includeusing namespace std;void fn1()static int n=0;n+;coutn的值为:nendl;int main()int i;for(i=0;i10;i+)fn1();return 0;/*实现一个名为 SimpleCircle的简单圆类其数据成员int *itsRadius为一个指向其半径的指针设计对数据成员的各种操作，给出这个类完整的实现并且测试这个类*/#includeusing namespace std;class SimpleCirclepublic:SimpleCircle()itsRadius=new int(5);SimpleCircle(int radius)itsRadius=new int(radius);SimpleCircle(const SimpleCircle & rhs)int val=rhs.getRadius();itsRadius=new int(val);SimpleCircle()int getRadius()constreturn *itsRadius;private:int *itsRadius;int main()SimpleCircle CircleOne,CircleTwo(9);coutCircleOne:CircleOne.getRadius()endl;coutCircleTwo:CircleTwo.getRadius()endl;return 0;/*定义一个Employee类，其中包括鞭尸姓名、地址城市、和邮编等属性，包括setName()和display()等函数。display()使用cout语句显示姓名、地址、城市和邮编等属性。函数setName()改变对象的姓名属性，实现并测试这个类。*/#include#includeusing namespace std;class Employeeprivate:char name30;char street30;char city15;char zip15;public:Employee(char* n,char* s,char* c,char* z)strcpy(name,n);strcpy(street,s);strcpy(city,c);strcpy(zip,z);void setName(char* n)strcpy(name,n);void display()coutnametstreett;coutcitytzipendl;int main()Employee e1(张三,平安大街,北京,100000);e1.display();e1.setName(李四);e1.display();coutendl;return 0;/*定义一个Shape,在此基础上派生出Rectangle和Circle,二者都有getArea()函数计算对象的面积。使用Rectangle类创建一个派生类Square。*/#includeusing namespace std;class Shapepublic:Shape()Shape()virtual float getArea()return -1;class Circle:public Shapepublic:Circle(float radius):itsRadius(radius)Circle()float getArea()return 3.14*itsRadius*itsRadius;private:float itsRadius;class Rectangle:public Shapepublic:Rectangle(float len,float width):itsLength(len),itsWidth(width);Rectangle();virtual float getArea()return itsLength*itsWidth;virtual float getLength()return itsLength;virtual float getWidth()return itsWidth;private:float itsLength;float itsWidth;class Square:public Rectanglepublic:Square(float len);Square();Square:Square(float len):Rectangle(len,len)int main()Shape *sp;sp=new Circle(5);coutThe area of the Circle isgetArea()endl;delete sp;sp=new Rectangle(4,6);coutThe area of the Rctangle isgetArea()endl;delete sp;sp=new Square(5);coutThe area of the Square isgetArea()endl;delete sp;return 0;/*定义一个哺乳动物类Mammal，再由此派生出Dog类，定义一个Dog类的对象，观察与派生类的构造函数的调用顺序Manmal constructor.Dog constructor.Mammal sound!Tail wagging.jack is 1 year oldDog destructor.Mammal destructor.*/#includeusing namespace std;enum myColorBLACK,WHITE;class Mammalpublic:/constructorsMammal();Mammal(); /accesasorsint getArea()constreturn itsAge;void setAge(int age)itsAge=age;int getWeight()constreturn itsWeight;void setWeight(int weight)itsWeight=weight;/Other menthodsvoid speak()constcoutMammal sound!n;protected:int itsAge;int itsWeight;class Dog:public Mammalpublic:Dog(); Dog();myColor getColor() constreturn itsColor; void setColor(myColor color)itsColor=color; void wagTail()coutTail wagging.n; private:myColor itsColor;Mammal:Mammal():itsAge(1),itsWeight(5)coutMammal constructor.n;Mammal:Mammal()coutMammal destructor.n;Dog:Dog():itsColor(WHITE)coutDog constructor.n;Dog:Dog()coutDog destructor.n;int main()Dog jack;jack.speak();jack.wagTail();coutjack isjack.getArea()years oldn;return 0;/*编写一个哺乳动物类Mammal，再由此派生出狗类Dog，二者都声明speak（）成员函数，该函数在基类中被声明为虚函数，声明一个Dog类的对象，通过此对象调用speak函数，观察运行结果。*/#includeusing namespace std;class Mammalpublic:Mammal()coutMammal constructor.n;virtualMammal()coutMammal destructor.n;virtual void speak()constcoutMammal speak!n;class Dog:public Mammalpublic:Dog()coutDog Constructor.n;Dog()coutDog destructor.n;void speak()constcoutspeak();delete pDog;return 0;/*请编写一个抽象类Shape，在此基础上派生出类Rectangle和Circle，二者都有计算对象面积的函数getArea()，计算对象周长的函数getPerim()。*/#includeusing namespace std;class Shapepublic:Shape()Shape()virtual float getArea()=0;virtual float getPerim()=0;class Circle:public Shapepublic:Circle(float radius):itsRadius(radius);Circle()float getArea()return 3.14*itsRadius*itsRadius;float getPerim()return 6.28*itsRadius;private:float itsRadius;class Rectangle:public Shapepublic:Rectangle(float len,float width):itsLength(len),itsWidth(width);Rectangle();virtual float getArea()return itsLength*itsWidth;float getPerim()return 2*itsLength+2*itsWidth;virtual float GetLength()return itsLength;virtual float GetWidth()return itsWidth;private:float itsLength;float itsWidth;int main()Shape *sp;sp=new Circle(5);coutThe area of the Circle isgetArea()endl;coutThe Perimeter of the Circle isgetPerim()endl;delete sp;sp=new Rectangle(4,6);coutThe area of the Rectangle isgetArea()endl;coutThe perimter of the Rectangle isgetPerim()endl;delete sp;return 0;/*对类Point重载+（自增）、-（自减）运算符，要求同时重载前缀和后缀的形式。*/#includeusing namespace std;class Pointpublic:Point& operator+();Point operator+(int);Point& operator-();Point operator-(int);Point()_x=_y=0;int x()return _x;int y()return _y;private:int _x,_y;Point&Point:operator+()_x+;_y+;return * this;Point Point:operator+(int)Point temp=* this;+ * this;return temp;Point&Point:operator-()_x-;_y-;return *this;Point Point:operator-(int)Point temp=*this;-*this;return temp;i