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#include
class point
{
public:
point(float a,float b)
{  
         x=a;
          y=b;
cout<<"x="< cout<<"y="< }
float getx()
{
return x;
}
    float gety()
{
return y;
}
private:
float x,y;
};
class circle:public point
{
private:
float r;
public:
circle(float a,float b,float c):point(a,b)
{
r=c;
cout<<"r="<    }
float area()
{
return 2*r*r*3.14;
};
    class cylinder:public circle
{
private:
float h;
public:
   cylinder(float a,float b,float c,float d):circle(float a,float b,float c)
   {
   h=d;
   cout<<"h="<   }
   float biao()
   {
   float m,n;
   m=2*3.14*r;
   n=m*h+2*circle::area();
   return n;
   }
   float tiji()
   {
   return circle::area()*h;
   };
   void main()
   {
   float s;
   cylinder c1;
          s=c1.tiji();
  cout<
   }
结果编译显示 'circle' : base class undefined
fatal error C1004: unexpected end of file found

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