第五讲：练习（基本语法）

Sian

Dog.h

1. #import <Foundation/Foundation.h>
2. @interface Dos:NSObject
3. {
4. @protected
5.      int ID;
6. @public
7.      int age;
8. @private
9.      float price
10. }
11. - (id) init;
12. - (id) intWithID:(int)newID;
13. - (id) intWithID:(int)newID andAge:(int)newAge;
14. - (id) intWithID:(int)newID andAge:(int)newAge andPrice(float)newPrice;
15. - (void) setID:(int)newID;
16. - (int) getID;
17. - (void) setAge:(int)newAge;
18. - (int) getAge;
19. - (void) setPrice:(float)newPrice;
20. - (float) getPrice;
21. - (void)setID:(int)newID andAge:(int)newAge;
22. - (void)setID:(int)newID andAge:(int)newAge andPrice:(float)newPrice;
23. @end

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Dog.m

1. #import "Dog.h"
2. @implenentation Dog
3. - (id) init
4. {
5.    self = [super init];
6.     if(self){
7.     ID = 1;
8.     age = 2;
9.     price = 60.0f;
10.     }
11.     return self;
12.     //return [self initWithID:1];
13. }
14. - (id) initWithID:(int)newID
15. {
16.     self = [super init];
17.       if(self){
18.       ID = newID;
19.       age = 2;
20.       price = 60.0f;
21.       }
22. return self;
23. //return [self initWithID:1 andAge:2];
24. }
25. - (id) initWithID:(int)newID andAge:(int)newAge
26. {
27.      self = [super init];
28.       if(self){
29.       ID = newID;
30.       age = newAge;
31.       price = 60.0f;
32.       }
33.      return self;
34. //return [self initWithID:1 andAge:2 andPrice:60.0f];
35. }
36. - (id) initWithID:(int)newID andAge:(int)newAge andPrice(float)newPrice
37. {
38.      self = [super init];
39.       if(self){
40.       ID = newID;
41.       age = newAge;
42.       price = newPrice;
43.       }
44.      return self;
45. }//最终的构造函数
46. - (void)setID:(int)newID
47. {
48.      ID = newID;
49. }
50. - (int)getID
51. {
52.      return ID;
53. }
54. - (void)setAge:(int)newAge
55. {
56.      age = newAge;
57. }
58. - (int)getAge
59. {
60.      return age;
61. }
62. - (void)setPrice:(float)newPrice
63. {
64.      price = newPrice;
65. }
66. - (float)getPrice
67. {
68.      return price;
69. }
70. - (void)setID:(int)newID andAge:(int)newAge
71. {
72.      ID = newID;
73.      age = newAge;
74. }
75. - (void)setID:(int)newID andAge:(int)newAge andPrice(float)newPrice
76. {
77.      ID = newID;
78.      age = newAge;
79.      price = newPrice;
80. }
81. @end

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main.m

1. #import <Foundation/Foundation.h>
2. #import "Dog.h"
3. int main(int argc, const char * argv[])
4. {
5. @autoreleasepool{
6.       Dog *dog1 = [Dog alloc];
7.       [dog1 init];
8.       int ID = [dog1 getID];
9.       int age = [dog1 getAge];
10.       float price = [dog1 getPrice];
11.       printf("dog1 id is %d age is %d price is %f \n",ID,age,price);
12.       // dog1 id is 1 age is 2 price is 60.0000
13.   
14.       Dog *dog2 = [[Dog alloc] initWithID:100 andAge:36 andPrice:68.88];
15.       int ID = [dog2 getID];
16.       int age = [dog2 getAge];
17.       float price = [dog2 getPrice];
18.       printf("dog2 id is %d age is %d price is %f \n",ID,age,price);
19.       //dog2 id is 100 age is 36 price is 68.879997
20.   
21.       Dog *dog2 = [[Dog alloc] setID:2012 andAge:38 andPrice:87.2];
22.       int ID = [dog2 getID];
23.       int age = [dog2 getAge];
24.       float price = [dog2 getPrice];
25.       printf("dog2 new id is %d age is %d price is %f \n",ID,age,price);
26.       //dog2 net id is 2012 age is 38 price is 87.19998  
27.      }
28.      return 0
29. }

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