无法解析的外部符号

┾断┡ē誸

1. #include <iostream>
   
2. 
   
3. class Student
   
4. {
   
5. public:
   
6.   Student();
   
7.   void scoretotalcount(double s);
   
8.   double sum();
   
9.   static double average();
   
10. protected:
    
11.   double score;
    
12.   static double total;
    
13.   static double count;
    
14. };
    
15. 
    
16. Student::Student()
    
17. {
    
18.    total=0;
    
19.    count=0;
    
20.    score=0;
    
21. }
    
22. double Student::sum()
    
23. {
    
24.   return Student::total;
    
25. }
    
26. 
    
27. double Student::average()
    
28. {
    
29.    return Student::total/Student::count;
    
30. }
    
31. 
    
32. void Student::scoretotalcount(double s)
    
33. {
    
34.    total+=s;
    
35.    count++;
    
36.    score=s;
    
37. }
    
38. 
    
39. int main()
    
40. {
    
41.    
    
42. }

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各位大大帮忙看看 啊 感激不尽啊

┾断┡ē誸

求助谢谢谢谢

仰望天上的光

1. #include <iostream>
   
2. 
   
3. 
   
4. class Student
   
5. 
   
6. {
   
7. 
   
8. public:
   
9. 
   
10.   Student();
    
11. 
    
12.   void scoretotalcount(double s);
    
13. 
    
14.   double sum();
    
15. 
    
16.   static double average();
    
17. 
    
18. protected:
    
19. 
    
20.   double score;
    
21. 
    
22.   static double total;
    
23. 
    
24.   static double count;
    
25. 
    
26. };
    
27. 
    
28. //加上这两行
    
29. double Student::total;
    
30. 
    
31. double Student::count;
    
32. 
    
33. Student::Student()
    
34. 
    
35. {
    
36. 
    
37.    total=0;
    
38. 
    
39.    count=0;
    
40. 
    
41.    score=0;
    
42. 
    
43. }
    
44. 
    
45. double Student::sum()
    
46. 
    
47. {
    
48. 
    
49.   return Student::total;
    
50. 
    
51. }
    
52. 
    
53. 
    
54. double Student::average()
    
55. 
    
56. {
    
57. 
    
58.    return Student::total/Student::count;
    
59. 
    
60. }
    
61. 
    
62. 
    
63. void Student::scoretotalcount(double s)
    
64. 
    
65. {
    
66. 
    
67.    total+=s;
    
68. 
    
69.    count++;
    
70. 
    
71.    score=s;
    
72. 
    
73. }
    
74. 
    
75. 
    
76. int main()
    
77. 
    
78. {
    
79. 
    
80.    
    
81. 
    
82. }

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