[已解决]请问各位这段代码是哪里出问题了呀，出现段错误的提示

dengyk

1. #include <stdio.h>
   
2. #include <stdlib.h>
   
3. 
   
4. struct Date
   
5. {
   
6.     int year;
   
7.     int month;
   
8.     int day;
   
9. };
   
10. 
    
11. struct Book
    
12. {
    
13.     char title[20];
    
14.     char author[10];
    
15.     float price;
    
16.     struct Date date;
    
17.     char publisher[20];
    
18. };
    
19. 
    
20. void getInput(struct Book* book)
    
21. {
    
22.     int count = 1;
    
23. 
    
24.     printf("Enter the %d's book name\n", count);
    
25.     scanf("%s", book->title);
    
26.     printf("Enter the author name\n");
    
27.     scanf("%s", book->author);
    
28.     printf("Enter the price\n");
    
29.     scanf("%f", &book->price);
    
30.     printf("Enter the date\n");
    
31.     scanf("%d %d %d", &book->date.year, &book->date.month, &book->date.day);
    
32.     printf("Enter the publisher\n");
    
33.     scanf("%s", book->publisher);
    
34. }
    
35. 
    
36. void printBook(struct Book* book)
    
37. {
    
38.     printf("Book name: %s\n", book->title);
    
39.     printf("Book author: %s\n", book->author);
    
40.     printf("Book price: %.2f\n", book->price);
    
41.     printf("Book date: %d-%d-%d", book->date.year, book->date.month, book->date.day);
    
42.     printf("Book publisher: %s", book->publisher);
    
43. }
    
44. 
    
45. void getSize(struct Book* book)
    
46. {
    
47.     book = (struct Book*)malloc(sizeof(struct Book));
    
48.     if (book == NULL)
    
49.     {
    
50.         printf("Error\n");
    
51.         exit(1);
    
52.     }
    
53. }
    
54. 
    
55. void freeLibrary(struct Book* book)
    
56. {
    
57.     free(book);
    
58. }
    
59. 
    
60. void main()
    
61. {
    
62.     int n;
    
63.     printf("How many books do you want to save?\n");
    
64.     scanf("%d", &n);
    
65.     struct Book* library[n];
    
66. 
    
67.     printf("Now start save book\n");
    
68.     for (int i = 0; i < n; i++)
    
69.     {
    
70.         getSize(library[i]);
    
71.         getInput(library[i]);
    
72.     }
    
73. 
    
74.     printf("Now list the information about all book\n");
    
75.     for (int i = 0; i < n; i++)
    
76.     {
    
77. 
    
78.         printf("This is the %d's book\n", i + 1);
    
79.         printBook(library[i]);
    
80.     }
    
81. 
    
82.     for (int i = 0; i < n; i++)
    
83.     {
    
84.         freeLibrary(library[i]);
    
85.     }
    
86. }
    
87. 
    

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最佳答案

月排行榜 / 总排行榜

sunrise085

2020-9-13 14:39:39

你在main中定义的是结构体指针数组，然后给指针分配空间，这样是有问题的，调用函数getSize动态分配给指针空间，函数结束后，就无效了。

应该是定义结构体数组，然后给数组内的每个元素动态分配空间
最后释放的时候先释放后面的元素

1. #include <stdio.h>
   
2. #include <stdlib.h>
   
3. 
   
4. struct Date
   
5. {
   
6.     int year;
   
7.     int month;
   
8.     int day;
   
9. };
   
10. 
    
11. struct Book
    
12. {
    
13.     char title[20];
    
14.     char author[10];
    
15.     float price;
    
16.     struct Date date;
    
17.     char publisher[20];
    
18. };
    
19. 
    
20. void getInput(struct Book* book)
    
21. {
    
22.     int count = 1;
    
23. 
    
24.     printf("Enter the %d's book name\n", count);
    
25.     scanf("%s", book->title);
    
26.     printf("Enter the author name\n");
    
27.     scanf("%s", book->author);
    
28.     printf("Enter the price\n");
    
29.     scanf("%f", &book->price);
    
30.     printf("Enter the date\n");
    
31.     scanf("%d %d %d", &book->date.year, &book->date.month, &book->date.day);
    
32.     printf("Enter the publisher\n");
    
33.     scanf("%s", book->publisher);
    
34. }
    
35. 
    
36. void printBook(struct Book* book)
    
37. {
    
38.     printf("Book name: %s\n", book->title);
    
39.     printf("Book author: %s\n", book->author);
    
40.     printf("Book price: %.2f\n", book->price);
    
41.     printf("Book date: %d-%d-%d", book->date.year, book->date.month, book->date.day);
    
42.     printf("Book publisher: %s", book->publisher);
    
43. }
    
44. 
    
45. void getSize(struct Book* book)
    
46. {
    
47.     book = (struct Book*)malloc(sizeof(struct Book));
    
48.     if (book == NULL)
    
49.     {
    
50.         printf("Error\n");
    
51.         exit(1);
    
52.     }
    
53. }
    
54. 
    
55. void freeLibrary(struct Book* book)
    
56. {
    
57.     free(book);
    
58. }
    
59. 
    
60. void main()
    
61. {
    
62.     int n;
    
63.     printf("How many books do you want to save?\n");
    
64.     scanf("%d", &n);
    
65.     struct Book library[n];  //这里定义成结构体数组
    
66. 
    
67.     printf("Now start save book\n");
    
68.     for (int i = 0; i < n; i++)
    
69.     {
    
70.         getSize(&library[i]);//这里实参为地址，下面几个函数调用时，实参也一样
    
71.         getInput(&library[i]);
    
72.     }
    
73. 
    
74.     printf("Now list the information about all book\n");
    
75.     for (int i = 0; i < n; i++)
    
76.     {
    
77. 
    
78.         printf("This is the %d's book\n", i + 1);
    
79.         printBook(&library[i]);
    
80.     }
    
81. 
    
82.     for (int i = n; i >0; i++)
    
83.     {
    
84.         freeLibrary(&library[i]);
    
85.     }
    
86. }

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跳转到最佳答案楼层

一枚丶学渣

你可以把那个i 放前边和n一块定义了应该就能运行了

dengyk

一枚丶学渣 发表于 2020-9-13 13:44
你可以把那个i 放前边和n一块定义了应该就能运行了

能运行，而且也不报错，可是运行到输入作者时就提示段错误，核心转存&#128579;

sunrise085

你在main中定义的是结构体指针数组，然后给指针分配空间，这样是有问题的，调用函数getSize动态分配给指针空间，函数结束后，就无效了。

应该是定义结构体数组，然后给数组内的每个元素动态分配空间
最后释放的时候先释放后面的元素

1. #include <stdio.h>
   
2. #include <stdlib.h>
   
3. 
   
4. struct Date
   
5. {
   
6.     int year;
   
7.     int month;
   
8.     int day;
   
9. };
   
10. 
    
11. struct Book
    
12. {
    
13.     char title[20];
    
14.     char author[10];
    
15.     float price;
    
16.     struct Date date;
    
17.     char publisher[20];
    
18. };
    
19. 
    
20. void getInput(struct Book* book)
    
21. {
    
22.     int count = 1;
    
23. 
    
24.     printf("Enter the %d's book name\n", count);
    
25.     scanf("%s", book->title);
    
26.     printf("Enter the author name\n");
    
27.     scanf("%s", book->author);
    
28.     printf("Enter the price\n");
    
29.     scanf("%f", &book->price);
    
30.     printf("Enter the date\n");
    
31.     scanf("%d %d %d", &book->date.year, &book->date.month, &book->date.day);
    
32.     printf("Enter the publisher\n");
    
33.     scanf("%s", book->publisher);
    
34. }
    
35. 
    
36. void printBook(struct Book* book)
    
37. {
    
38.     printf("Book name: %s\n", book->title);
    
39.     printf("Book author: %s\n", book->author);
    
40.     printf("Book price: %.2f\n", book->price);
    
41.     printf("Book date: %d-%d-%d", book->date.year, book->date.month, book->date.day);
    
42.     printf("Book publisher: %s", book->publisher);
    
43. }
    
44. 
    
45. void getSize(struct Book* book)
    
46. {
    
47.     book = (struct Book*)malloc(sizeof(struct Book));
    
48.     if (book == NULL)
    
49.     {
    
50.         printf("Error\n");
    
51.         exit(1);
    
52.     }
    
53. }
    
54. 
    
55. void freeLibrary(struct Book* book)
    
56. {
    
57.     free(book);
    
58. }
    
59. 
    
60. void main()
    
61. {
    
62.     int n;
    
63.     printf("How many books do you want to save?\n");
    
64.     scanf("%d", &n);
    
65.     struct Book library[n];  //这里定义成结构体数组
    
66. 
    
67.     printf("Now start save book\n");
    
68.     for (int i = 0; i < n; i++)
    
69.     {
    
70.         getSize(&library[i]);//这里实参为地址，下面几个函数调用时，实参也一样
    
71.         getInput(&library[i]);
    
72.     }
    
73. 
    
74.     printf("Now list the information about all book\n");
    
75.     for (int i = 0; i < n; i++)
    
76.     {
    
77. 
    
78.         printf("This is the %d's book\n", i + 1);
    
79.         printBook(&library[i]);
    
80.     }
    
81. 
    
82.     for (int i = n; i >0; i++)
    
83.     {
    
84.         freeLibrary(&library[i]);
    
85.     }
    
86. }

复制代码

dengyk

sunrise085 发表于 2020-9-13 14:39
你在main中定义的是结构体指针数组，然后给指针分配空间，这样是有问题的，调用函数getSize动态分配给指针 ...

谢谢老哥