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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 & aBook.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)
~~```~~
#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){

I'm attempting a [question](https://software.codidact.com/uploads/wxoGToBH6tVpJFBLwBv7P566) 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` & `aBook.subject` (I'm not sure if I'm doing it right too). Can anyone help me out? (Also my title, author and book should not exceed 49 characters)
#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){

c data-structures linked-list

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