Debugging book search application - assignment

[momotaro]

You are to write a card catalog type definition. There are up to 1000 books, and for each one you need:
Title
A list of up to 5 authors
Catalog number
A list of up to 5 subject headings
Status (checked out or in the library)
Write a function “SearchBySubject” that takes as parameters the database of books and a subject (string). It should find all books with that subject and print their title, first author, and catalog number.

#include<stdio.h>
 
typedef struct
{
    char title[20];
    author author;
    subject subject;
    int cat_num;
    char In_Out;
}book;
 
typedef struct
{
    char author[20];
}author;
 
typedef struct
{
    char subject[20];
}subject;
 
void alloc_BookNum(int BookNum, book book_arr[]);
void alloc_AuthNum(int AuthNum, author author_arr[]);
void alloc_SubNum(int SubNum, subject subject_arr[]);
void get_data(book *arr_book[]);
void SearchBySubject(book arr_book[], char subject);
 
 
void main()
{
    alloc_BookNum(BookNum, book_arr[]);
    alloc_AuthNum(int AuthNum, author author_arr[]);
    alloc_SubNum(int SubNum, subject subject_arr[]);
    SearchBySubject(arr_book[], subject);
    while(1);
}
 
void alloc_BookNum(int BookNum, book book_arr[])
{
    book *book_arr;
    printf("Enter the number of the books --> "); scanf("%d", &BookNum);
    book_arr = (book*)calloc(BookNum, sizeof(book));
}
 
void alloc_AuthNum(int AuthNum, author author_arr[])
{
    author *author_arr;
    printf("Enter the number of the authors --> "); scanf("%d", &AuthNum);
    author_arr = (author*)calloc(AuthNum, sizeof(author));
}
 
void alloc_SubNum(int SubNum, subject subject_arr[])
{
    subject *subject_arr;
    printf("Enter the number of subjects --> "); scanf("%d", &SubNum);
    subject_arr = (subject*)calloc(SubNum, sizeof(subject));
}
 
 
void get_data(book book_arr[], author author_arr[], subject subject_arr[])
{
    int i, j, k;
    for(i = 0; i < BookNum; i++)
    {
        printf("TITLE --> "); scanf("%s", book_arr[i].title);
        for(j = 0; j < SubNum; j++)
         {
            printf("AUTHOR %d --> ", &AuthNum); scanf("%s", author_arr[j].author);
         }
        for(k = 0; k < SubNum ; k++)
         {
            printf("SUBJECT %d --> ", &SubNum); scanf("%s", subject_arr[k].subject);
         }
        printf("CATALOG NUMBER --> "); scanf("%d", &book_arr[i].cat_num);    
        printf("STATUS(IN/OUT) --> "); scanf("%s", &book_arr[i].In_Out);
    }
}
 
void SearchBySubject(book book_arr[], char subject)
{
    char subject;
    int i;
    printf("ENTER YOUR SUBJECT --> "); scanf("%s", &subject);
    for(i = 0; i < SubNum; i++)
    {
        if((strlen(book_arr[i].subject.subject[i])-strlen(subjet)) == 0)
        {
            if(strcmp(toupper(subject_arr[i].subject), toupper((subject))) == 0)
            {
                prinf("TITLE --> %s", book_arr[i].title);
                printf("AUTHOR --> %s", book_arr[i].author.author[0]);
                printf("CATALOG NUMBER --> ", book_arr[i].cat_num);
            }
        }
        else
            printf("THERE IS NO RESULT MUCHING YOUR REQUEST !");
    }
}

[sicarie]

momotaro-

That looks like an interesting program, did you have a question about it? (ie, are you getting an error on the 'Search by Subject' function you provided? If so, what's the error, if not, what's your question?)