1. //分数类
   
2. #import <Foundation/Foundation.h>
   
3. @interface Scord:NSObject
   
4. {
   
5.     @public
   
6.     int cScord;
   
7.     int ocScord;
   
8.     int iosScord;
   
9. }
   
10. - (int)compare_cScordWithother:(Scord *)other;
    
11. - (int)compare_ocScordWithother:(Scord *)other;
    
12. - (int)compare_iosScordWithother:(Scord *)other;
    
13. - (int)sumAll;
    
14. - (int)average;
    
15. @end
    
16. @implementation Scord
    
17. - (int)compare_cScordWithother:(Scord *)other
    
18. {
    
19.     return cScord-other->cScord;
    
20. }
    
21. - (int)compare_ocScordWithother:(Scord *)other
    
22. {
    
23.     return ocScord-other->ocScord;
    
24. }
    
25. - (int)compare_iosScordWithother:(Scord *)other
    
26. {
    
27.     return iosScord-other->iosScord;
    
28. }
    
29. - (int)sumAll
    
30. {
    
31.     return cScord+ocScord+iosScord;
    
32. }
    
33. - (int)average
    
34. {
    
35.     return (cScord+ocScord+iosScord)/3;
    
36. }
    
37. @end
    
38. //学生类
    
39. @interface Student:NSObject
    
40. {
    
41.     @public
    
42.     char *name;
    
43.     int number;
    
44.     Scord *s;
    
45. }
    
46. - (int)compare_cScordWithother:(Student *)other;
    
47. @end
    
48. @implementation Student
    
49. - (int)compare_cScordWithother:(Student *)other
    
50. {
    
51.     return [s compare_iosScordWithother:other->s];
    
52. }
    
53. @end
    
54. int main()
    
55. {
    
56.   
    
57.     Student *a=[Student new];
    
58.     Scord *s1=[Scord new];
    
59.     a->name="jack";
    
60.     a->number=22;
    
61.     a->s=s1;
    
62.     s1->cScord=90;
    
63.     Student *a1=[Student new];
    
64.     Scord *s2=[Scord new];
    
65.     a1->name="rose";
    
66.     a1->number=23;
    
67.     a1->s=s2;
    
68.     s2->cScord=92;
    
69.     int b=[a compare_cScordWithother:a1];
    
70.     NSLog(@"%d",b);
    
71. }
    
72. 输出结果不正确,求帮助

复制代码

楼上正解，我试了一下，也是51行出错，学生类调用的是 C ，而内部实现却是 IOS，
把 compare_iosScordWithother  改为 compare_cScordWithother 即可

代码51行错了，改为：

1. return [s compare_cScordWithother:other->s];

复制代码

这个函数是计算C语言的分数，你调到ios分数了，结果自然就不正确了。