#import <Foundation/Foundation.h>

 //xieyi

 @protocol showOn

 @required

 -(void)printOn;

 @end

 // lei

 @interface MyPoint : NSObject<showOn,NSCopying>{

     int x;

     int y;

 }

 @property (nonatomic,assign)int x,y;

 -(id)initWithX:(int)_x andY:(int)_y;

 @end

 // leibie fenlei

 @interface MyPoint(MoveSet)

 -(void)moveToX:(int)_x andY:(int)_y;

 @end

 #import "MyPoint.h"

 @implementation MyPoint

 @synthesize x,y;

 -(id)initWithX:(int)_x andY:(int)_y{

     if(_x==)

         x=;

     if(_y==)

         y=;

     x=_x;

     y=_y;

     return self;

 }

 -(id)copyWithZone:(NSZone *)zone{

     MyPoint* newPoint=[[MyPoint allocWithZone:zone] initWithX:x andY:y];

     return newPoint;

 }

 -(void)printOn{

     NSLog(@" x = %d , y = %d ",x,y);

 }

 @end

 @implementation MyPoint(MoveSet)

 -(void)moveToX:(int)_x andY:(int)_y{

     x=_x;

     y=_y;

 }

 @end

 #import <Foundation/Foundation.h>

 #import "MyPoint.h"

 @interface Circle : NSObject<showOn>{

     MyPoint* point;

     int radius;

 }

 @property (nonatomic,copy)MyPoint* point;

 @property (nonatomic,assign)int radius;

 -(id)initWithPoint:(MyPoint* )_p andRadius:(int)_r;

 -(id)initWithPoint:(MyPoint *)_p;

 @end

 #import "Circle.h"

 @implementation Circle

 @synthesize point;

 @synthesize radius;

 -(id)initWithPoint:(MyPoint *)_p andRadius:(int)_r{

     if(_r==)

     {

         radius=;

     }

     if(_p==nil)

         return nil;

     if(self=[super init])

     {

         if(point!=_p)

         {

             if(point)

                 [point release];

             point =[[MyPoint alloc]initWithX:_p.x andY:_p.y];

         }

     }

         radius=_r;

         return self;

 }

 -(id)initWithPoint:(MyPoint*)_p{

     self=[self initWithPoint:_p andRadius:];

     return self;

 }

 -(void)printOn{

     NSLog(@"point(x,y) = (%d,%d),radius = %d",point.x,point.y,radius);

 }

 -(void) dealloc{

     [point release];

     [super dealloc];

 }

 @end