用继承实现XYPoint和Circle两个类
1 #import <Foundation/Foundation.h>
2 @protocol show
3 @required
4 -(void)printOn;
5 @end
6
7 @inte易做图ce XYPoint : NSObject<show>{
8 int x;
9 int y;
10 }
11 @property (nonatomic,assign)int x,y;
12 -(id)setX:(int)_x andY:(int)_y;
13
14 @end
15
16 #import "XYPoint.h"
17
18 @implementation XYPoint
19 @synthesize x,y;
20
21 -(id)setX:(int)_x andY:(int)_y{
22 self.x=_x;
23 self.y=_y;
24 return self;
25 }
26 -(void)printOn{
27 NSLog(@"x = %d ,y = %d",x,y);
28 }
29 @end
30
31 #import <Foundation/Foundation.h>
32 #import "XYPoint.h"
33 @inte易做图ce Circle : XYPoint<show>{
34 int radius;
35 }
36 @property (nonatomic,assign)int radius;
37 -(id)initWithX:(int)_x andY:(int)_y andRadius:(int)_r;
38 -(double)area;
39 -(double)perimeter;
40 @end
41
42 #import "Circle.h"
43
44 @implementation Circle
45 @synthesize radius;
46 -(id)initWithX:(int)_x andY:(int)_y andRadius:(int)_r;
47 {
48 self.x=_x;
49 self.y=_y;
50 self.radius=_r;
51 return self;
52 }
53
54 -(double)area{
55 return 3.14*radius*radius;
56 }
57
58 -(double)perimeter{
59 return 2*3,14*radius;
60 }
61
62 -(void)printOn{
63 NSLog(@"x = %d, y = %d ,radius = %d",x,y,radius);
64
65 }
66 @end
补充：软件开发 , C语言 ,
