在下面程序的横线处填上适当内容,完成类的定义。

class line;

class box

{private:

int color;

int upx, upy;

int lowx, lowy;

public:

____________

void set_color (int c){color=c;}

void define_box (int xl, int yl, int x2, int y2)

{upx=x1;upy=y1;lowx=x2;lowy=y2;}

};

class line

{private:

int color;

int startx, starty;

int endx, endy;

public:

friend int same_color( line 1, box b);

void set_color (int c){color=c;}

void define_line(____________)

{startx =x1;starty =yl;endx =x2;endy =y2;}

};

int same_color( line 1, box b)

{if (1.color =b.color)return 1;

return 0;

}

求n(n=3)个学生的最高分和最低分及姓名,已有 student类声明和main函数,完成 student类的实现部分。

#include

#include< string.h>

class student

{char name[10];

int deg;

public:

student(char na[]="",int d=0);

char*getname();

friend int compare(student &s1,student &s2);

int getdeg();

};

void main()

{student st[]={student("王强",74), student("李刚",68), student("张雪",84)};

int i=0, min=0, max=0;

for(i=1;i<3;i++)

{if(compare(st[max],st[i])==-1)

max=i;

if(compare(st[min],st[i])==1)

min=i;

}

cout<"最高分:"<

cout<<"最低分:"<<(*(st+min)).getdeg()<"姓名:"

}

给出下面程序输出结果。

#include

class Base

{private:

int Y;

public:

Base(int y=0){Y=y;cout<<"Base("<

~Base(){cout<<"~Base()\n";}

void print(){cout<

};

class Derived:public Base

{private:

 int Z;

 public:

 Derived(int y,int z):base(y)

{Z=z;

cout<<"Derived("<

}

 ~Derived(){cout<<"~Derived()\n";

 void print()

{base::print()

cout<

};

void main()

{Derive d(10,20);

d.print();

}

给出下面程序的输出结果。

#include

class A

{public:

A(){al=0;}

A(int i)al=i;}

void printout(){cout<

private:

int al;

};

class B:public A

{public:

B(){b1=0;}

B(int i,int j,int k);

void printout();

private:

int bl;

A aa;

};

B::B(int i,int j,int k):A(i),aa(j)

{bl=k;}

void B::printout()

{A::printout();

cout<

void main()

{B tt2];

tt [0=B(9,3,5);

t[1]=B(8,4,7);

for(int i=0;i<2;i++)

tt[i].printout();

}

#include

#include

class arr

{____________

int s;

public:

Arr(int a[],int n)

{v=a;

s=n;

}

int size(){return s;}

int&operator()(int n);

};

____________()(int n)

{if(n>s)

{cerr<<"下标越界!"<

exit(1);

}

return v[n];

}

程序的输出结果如下:

30

9

请根据输出数据在下面程序中的下横线处填写正确的语句。

#include

class Test

{private:

int m;

public:

Test(int i=0)

{m=i;}

void show()

{cout<

void set(int i)

{m=i;}

};

void main()

{Test*p1= new Test[2],*p2;

p2=p1;

p1->set(30);

p1->show();

Test[2]={1,9};

___________

p1->show();

pl=p2;

___________//释放空间

}

在下面程序的横线处填上适当内容,完成类的定义。

class line;

class box

{private:

int color;

int upx, upy;

int lowx, lowy;

public:

____________

void set_color (int c){color=c;}

void define_box (int xl, int yl, int x2, int y2)

{upx=x1;upy=y1;lowx=x2;lowy=y2;}

};

class line

{private:

int color;

int startx, starty;

int endx, endy;

public:

friend int same_color( line 1, box b);

void set_color (int c){color=c;}

void define_line(____________)

{startx =x1;starty =yl;endx =x2;endy =y2;}

};

int same_color( line 1, box b)

{if (1.color =b.color)return 1;

return 0;

}

#include

#include

class dis

{private:

double x,y;

public:

dis(________){x=x1;y=y1;}

double getx(){return x;}

double gety(){return y;}

________double log(dis&,dis&);

};

double dis::log(dis&a,dis&b)

double px=a.x-b.x;

double py=a.y-b.y;

return sqrt(px*px+py*py);

}

void main()

dis pl(3.5,4.5),p2(5.5,6.5);

double d=dis::log(p1,p2);

cout<<"The distance is"<

}

在下列程序的横线处填上适当的语句,使输出为:0,2,10

#include

#include

class Magic

{double x;

public:

Magic(double d=0.00)(fabs(d))

{}

Magic operator+(___________)

{

return Magic(srt(x*x+c.x*c.x));

}

___________operator<<(ostream& stream,Magic &c)

{stream<

return stream;

 }

};

void main()

{Magic ma;

cout<

}

#include

class Test

{int x,y;

public:

void fun(int i,int j)

{x=i;y=j;}

void show()

{cout<<"x="<

if(y)

cout<<",y="<

};

void main()

{Test a;

A.fun(1);

A.show();

A.fun(2,4);

A.show();

}

#include 

class A 

{int i; 

public: 

virtual void fun()

cout<<"A:fun()"<

A(int a){i=a;}

}; 

class B:public A 

{int j;public: 

void fun(){cout<<"B::fun()\n";}

B(int b,int c){j=c;}

};

void main()

{A*p;

B b(3,5);

p=&b;

p->fun();

}