c++ 期末练习题+答案(5)

};

}

double l;

private:

class Rectangle:public Shape{ public: };

class Trapezoid:public Shape{ public: };

class Triangle:public Shape{ public: };

int main() {

Shape *shaps[5];

shaps[0]=new Circle(12.6); shaps[1]=new Square(3.5); shaps[2]=new Rectangle(4.5,8.4); shaps[3]=new Trapezoid(2.0,4.5,3.2); shaps[4]=new Triangle(4.5,8.4);

Triangle(double aa,double hh):a(aa),h(hh){} virtual double area() { }

double a,h;

return a*h;

Trapezoid(double aa,double bb,double cc): a(aa),b(bb),h(cc){} virtual double area() { }

double a,b,h;

return (a+b)*h/2;

Rectangle(double aa,double bb): a(aa),b(bb){} virtual double area() { }

double a,b;

return a*b;

private:

private:

private:

}

double s=0;

for(int i=0;i<5;++i) { }

cout<

s+=shaps[i]->area();

cout<area()<

2、 类Communication的定义如下：

class Communication{

private:

char *potocol_name; char *verion; int size; public:

Communication(Communication &comm)； }

(1)定义其构造函数，实现浅拷贝。 (2)定义其构造函数，实现深拷贝。

Communication::Communication(Communication &comm)//浅拷贝 { }

void strcopy(char d[],char s[]) { }

Communication::Communication(Communication &comm)//深拷贝 { }

strcopy(potocol_name,comm.potocol_name); strcopy(version,comm.verion); size=comm.size;

d=new char[strlen(s)+2]; strcpy(d,s);

potocol_name=comm.potocol_name; verion=comm.verion; size=comm.size;

3.下列shape类是一个表示形状的抽象类，area()为求图形面积的函数，total()则是一个通用的用以求不同形状的图形面积总和的函数。请从 shape类派生圆类(Circle)、矩形类(rectangle)，并给出具体的构造函数和求面积函数。给出shape的定义如下所示。

class shape{ public∶

virtual float area()=0 };

const float Pi=acos(-1.0); class Shape{ public: };

class Circle:public Shape{ public: };

class Rectangle:public Shape{ public: };

float total(Shape *shaps[],int len) { }

int main() {

Shape *shaps[5];

shaps[0]=new Circle(12.6); shaps[1]=new Rectangle(4.5,8.4); float s=0;

for(int i=0;i

return s;

s+=shaps[i]->area(); Rectangle(float aa,float bb): a(aa),b(bb){} virtual float area() { }

float a,b;

return a*b; Circle(float a):r(a){} virtual float area() { } float r;

return r*r*Pi; virtual float area()=0{}

private:

private:

}

cout<

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