全名k歌怎么一天升级12:c++编程题

#include <iostream.h>
#include <stdlib.h>
const double PI=3.14159;
class shape
{
protected:
int x,y;
public:
virtual void show()=0;
virtual double GetArea()=0;
};

class Rectangle:public shape
{
int length,width,time;
public:
void set(int n,int a,int b,int c,int d)
{
x=a;y=b;length=c;width=d;
time=n;
}
double GetArea()
{
return (length*width);
}
void show()
{
cout<<"Rectangle "<<time<<": Area="<<GetArea()<<" center point=("<<x;
cout<<","<<y<<")"<<endl;
}
};

class Circle:public shape
{
int radius,time;
public:
void set(int n,int a,int b,int c)
{
x=a;y=b;radius=c;
time=n;
}
double GetArea()
{
return PI*(radius*radius);
}
void show()
{
cout<<"Circle "<<time<<": Area="<<GetArea()<<" center point=("<<x;
cout<<","<<y<<")"<<endl;
}
};

class Cube:public shape
{
int length,time;
public:
void set(int n,int a,int b,int c)
{
x=a;y=b;length=c;
time=n;
}
double GetArea()
{
return (length*length*6);
}
void show()
{
cout<<"Cube "<<time<<": Area="<<GetArea()<<" center point=("<<x;
cout<<","<<y<<")"<<endl;
}
};

int main()

{

int ch;

int a,b,c,d,i;

int n=1,i1=0,i2=0,i3=0;

shape *obj[100];

Rectangle s1[100];

Circle s2[100];

Cube s3[100];

while(cin>>ch) //读取第一个字符

{

if(ch==1) //Rectangle
{
cin>>a>>b>>c>>d;

s1[i1].set(n,a,b,c,d);

obj[n]=&s1[i1];

i1++;

}

else if(ch== 2) //Circle
{
cin>>a>>b>>c;

s2[i2].set(n,a,b,c);

obj[n]=&s2[i2];

i2++;

}

else if(ch== 3) //Cube
{
cin>>a>>b>>c;

s3[i2].set(n,a,b,c);

obj[n]=&s3[i2];

i3++;

}

n++;

}//while

for(i=1;i<n;i++) //输出各项参数

obj[i]->show();

return 0;

}