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  • 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 @interface 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 @interface 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
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  • 原文地址:https://www.cnblogs.com/wsq724439564/p/3272908.html
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