#include ﹤iostream. h﹥

using namespace std;

class A

{

int x, y;public:void set(int a, int b)

{

 x=a; y=b;

}

int getx( )

{

return x;

 }

int gety( )

{

return y;

}

int sum( )

{

return x+y;

}

};int main( )

 {

A a;a. set(3, 4);

cout﹤﹤a.x﹤﹤a.y﹤﹤ a.sum( )﹤﹤ endl;

return 0;

}

设计一个圆类circle和一个桌子类table。circle类包含私有数据成员radius和求圆面积的成员函数getarea( );table类包含私有数据成员height和返回高度的成员函数getheight( )。roundtable类继承所有上述类的数据成员和成员函数，添加了私有数据成员color和相应的成员函数。其中，main函数已给出。请完成程序的其他部分。

void main( ){roundtable rt(0.8,1.2,"黑色");

cout﹤"圆桌属性数据"﹤endl;cout﹤﹤"高度:"﹤﹤rt.getheight( )﹤"米"﹤﹤endl;

cout﹤"面积:"﹤﹤tr. geared( )﹤"平方米"﹤﹤endl;

cout﹤﹤"颜色"﹤﹤rt. getcolor( )﹤﹤endl;}

#include ﹤iostream.h﹥

using namespace std;

class Sample

 {

protected:

int x;

public:

Sample( )

 {

x=0;

 }

Sample(int val)

 {

 x=val;

}

void operator++( )

{

 x++;

}

};

class Derived:

public Sample

{

int y;

public:

Derived( ):

Sample( )

 {

 y=0;

}

Derived ( int val1, int val2):

Sample(val1 )

 {

 y=val2;

}

void operator--( )

 {

x--; y--;

}

void disp( )

{

cout﹤﹤"x="﹤﹤x﹤﹤",y="﹤﹤y﹤﹤ endl;

}

};

void main( )

 {

Derived d(3, 5);

D. disp( );d++;

D. disp( );d--;d--;

D. disp( );

}

#include ﹤iostream﹥

using namespace std;

void Result(char ch)

{

switch(ch)

{

case 'A':

case 'a':

 cout ﹤﹤"well!";

break;

case 'B':

 case 'b':

cout ﹤﹤"good!";

 break;

case 'C':

case 'c':

cout ﹤﹤"pass!";

break;

default:

cout ﹤﹤"bad!"; break;

}

}

void main( )

{

char a1='b', a2='C', a3='f';

cout ﹤﹤"Results:"﹤ endl;

Result(a1);

Result(a2 );

Result(a3);

Result('A');

}

#include ﹤iostream.h﹥

class Point

{

int X,Y;

public:

Point(int x=0, int y=0)

{

 X=x; Y=y; Countp ++;

}

Point( point &p)

{

X=p. X; Y=p.Y;

 }

~Point( )

{

 Countp--;

 }

_____________;

static int Countp;void display( )

{

 cout ﹤﹤X﹤﹤", "﹤﹤Y﹤﹤", ";

 }

};

Point myfun( Point p1, Point p2, Point p3)

{

 Point tmp(p1. X+p2. X+P3. X, p1. Y+p2.Y+p3. Y);

return tmp;

}

int Point:: Countp =0;

void main( )

{

 Point pp,p1(1,2),p2(1);

Point p=myfun(pp0, pp1, pp2);

p. display ( );

_____________; //输出Countp的值

}

完成程序，使其结果为x=6,y=10x=11,y=10

#include ﹤iostream.h﹥

using namespace std;

class Sample

{

private:int x;

_____________;

public:

Sample (int a);

void print( );

};

Sample:

Sample( _____________ )

{

 x=a; y=x++;

}

void Sample:: print( )

{

cout ﹤﹤"x="﹤﹤x﹤﹤",y="﹤﹤y﹤﹤end;

}

int Sample: : y =25;

void main( )

{

 Sample s1(5);

Sample s2(10);

s1. print( );

s2. print( );

}

完成程序，使其输出结果为79

#include ﹤iostream. h﹥

using namespace std;

int main( )

{

int a[6]={23,15,64,33,40,58

};

_____________;

s1=s2=a[0];

for(int *p=a+1;

 p﹤a+6; p++)

 {

if(s1﹥*p) s1=*p;

if _____________;

}

cout ﹤﹤s1 +s2 ﹤﹤endl;

return 0;

}

#include ﹤iostream. h﹥

using namespace std;

_____________;

_____________;

{

T tmp =x*x+y*y+x*y;return tmp;

}

int main( )

{

int x1=1, y1 =4;

float x2=1.1, y2=2.2;

double x3=2.0, y3=3.1;

cout﹤﹤fun(x1, y1)﹤﹤endl;

cout ﹤﹤fun(x2, y2)﹤﹤endl;

cout ﹤﹤fun(x3, y3)﹤﹤ endl;

return 0;

}

把从键盘上输入的一批整数(以-1作为终止输入的标志)保存到文本文件“a:xxk1.dat”中。

#include ﹤iostream﹥

#include ﹤fstream.h﹥

#include ﹤stdlib. h﹥

void main( )

{

ofstream fout("a: xxk1.dat");

if( _____________ )

 {

cout﹤﹤"文件没有打开!"﹤﹤end;

exit(1);

}

int x;cin﹥﹥x;

while(x! =-1)

{

fout ﹤﹤x﹤﹤' ';

cin ﹥﹥x;

}

_____________; //关闭文件

}

申请一个长度为10的int型空间，之后释放该空间。

#include ﹤iostream. h﹥

using namespace std;

int main( )

{

int *p=new int[ 10];

delete p;

return 0;

}

#include ﹤iostream. h﹥

using namespace std;

class A

{

int x, y;public:void set(int a, int b)

{

 x=a; y=b;

}

int getx( )

{

return x;

 }

int gety( )

{

return y;

}

int sum( )

{

return x+y;

}

};int main( )

 {

A a;a. set(3, 4);

cout﹤﹤a.x﹤﹤a.y﹤﹤ a.sum( )﹤﹤ endl;

return 0;

}