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Regarding the implementation of data structures.

Regarding the implementation of data structures.

Regarding the implementation of data structures.

![Question Part 1](https://software.codidact.com/uploads/wxoGToBH6tVpJFBLwBv7P566)

Hi, I'm attempting a question to do with data structures, file streams & linked lists. The code isn't complete yet as I am still halfway working on it. I am required to use data structures in the declaration section like so as shown in my code below. However, I'm still confused on what I should include in the double quotes for aBook.title, aBook.author & a.Book subject (I'm not sure if I'm doing it right too). Can anyone help me out?  thanks~ (Also my title, author and book should not exceed 49 characters, how should I do this?)

```
#include<stdio.h>
#include<stdlib.h>
//#define MAX 49
int main (void){
   FILE *cfPtr; 
   struct book{ //the data structure that I am required to use
     char *title;
     char *author;
     char *subject; //subject[]
   };
   int operation;

   if ((cfPtr = fopen("library.dat","w")) == NULL){
    printf("File could not be opened...\n");
   }
   else {
        struct book aBook;
        struct book *aPtr;
        
        aBook.title = ""; //how should I write in the double quotes?
        aBook.author = ""; 
        aBook.subject = "";
        
        printf("Enter operation number:");
        scanf("%d", &operation)
        switch(operation){
            case 1:
            printf("Title:\n"); 
            scanf("%s", title); 
            printf("Author:");
            scanf("%s", author);
            printf("Subject:");
            scanf("%s", subject);
            break;

            case 2:
            printf("Enter Title:");
            scanf("%s", Title);
//I'm planning to use switch case by looking at the question but I also have to use linked lists
            fprintf(cfPtr, "%s %s %s\n", title, author, subject); 
        }

        fclose(cfPtr); 
return 0;
}