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Q&A How can I delete a book from the collection by a particular title from my library file?

I would like to delete a book from the collection by a particular title from my library if the user enters 2 as input for my switch statement. How can I do that with my current code? #include<...

0 answers · posted 3y ago by hamburgersarecool‭ · edited 3y ago by hamburgersarecool‭

Question c data-structures file-format linked-list filestream

#3: Post edited by

hamburgersarecool‭ · 2021-12-09T14:08:37Z (almost 3 years ago)

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I would like to delete a book from the collection by a particular title
from my library if the user enters 2 as input for my switch statement. How can I do that with my current code?
```#include<stdio.h>
#include<stdlib.h>
#define MAX 49
//void addBook(struct library* thislib){
//}
struct book{
char *title;
char *author;
char *subject; //subject[]
};
struct library {
struct book collection;
int num_books;
struct library *next; //store address of next node
};
struct book collection; //supposed to be aBook
struct book *aPtr;
struct library aCollection;
struct library *aaPtr;
int main (void){
FILE *cfPtr; //pointer points to the newly created file
char strtitle[MAX];
char strauthor[MAX];
char strsubject[MAX];
int operation;
if ((cfPtr = fopen("library.dat","w")) == NULL){
printf("File could not be opened...\n");
}
else {
while (!feof()){
operate();
printf("Enter an operation: ");
scanf("%d", &operation);
/*case 1: coding of the switch statement*/
case 2: //here
if(!isEmpty(aPtr)){ //if list is not empty
aaPtr = NULL;
print("%s", "Enter title of the book to delete:\n");
scanf("%s", &strtitle);
aCollection.collection = strtitle;
delete(strtitle);
printf("The book %s has been removed from the library.", aBook.title);
fprintf(cfPtr, "The book %s has been removed from the library.", aBook.title);
}
else{
printf("Item not found!");
}
else{
puts("List is empty.\n");
}
}
break;
/*
```

I would like to delete a book from the collection by a particular title
from my library if the user enters 2 as input for my switch statement. How can I do that with my current code?
```#include<stdio.h>
#include<stdlib.h>
#define MAX 49
//void addBook(struct library* thislib){
//}
struct book{
char *title;
char *author;
char *subject; //subject[]
};
struct library {
struct book collection;
int num_books;
struct library *next; //store address of next node
};
struct book collection; //supposed to be aBook
struct book *aPtr;
struct library aCollection;
struct library *aaPtr;
int main (void){
FILE *cfPtr; //pointer points to the newly created file
char strtitle[MAX];
char strauthor[MAX];
char strsubject[MAX];
int operation;
if ((cfPtr = fopen("library.dat","w")) == NULL){
printf("File could not be opened...\n");
}
else {
while (!feof()){
operate();
printf("Enter an operation: ");
scanf("%d", &operation);
/*case 1: coding of the switch statement*/
case 2: //here
if(!isEmpty(aPtr)){ //if list is not empty
aaPtr = NULL;
print("%s", "Enter title of the book to delete:\n");
scanf("%s", &strtitle);
aCollection.collection = strtitle;
delete(strtitle);
printf("The book %s has been removed from the library.", aBook.title);
fprintf(cfPtr, "The book %s has been removed from the library.", aBook.title);
}
else{
printf("Item not found!");
}
else{
puts("List is empty.\n");
}
}
break;
/*unfinished coding, I'm still working on this code*/
```

#2: Post edited by

hamburgersarecool‭ · 2021-12-09T14:07:15Z (almost 3 years ago)

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I would like to delete a book from the collection by a particular title
~~from my library, as Case 2 of my switch statement. How can I do that with my current code?~~
```#include<stdio.h>
#include<stdlib.h>
#define MAX 49
//void addBook(struct library* thislib){
//}
struct book{
char *title;
char *author;
char *subject; //subject[]
};
struct library {
struct book collection;
int num_books;
struct library *next; //store address of next node
};
struct book collection; //supposed to be aBook
struct book *aPtr;
struct library aCollection;
struct library *aaPtr;
int main (void){
FILE *cfPtr; //pointer points to the newly created file
char strtitle[MAX];
char strauthor[MAX];
char strsubject[MAX];
int operation;
if ((cfPtr = fopen("library.dat","w")) == NULL){
printf("File could not be opened...\n");
}
else {
while (!feof()){
operate();
printf("Enter an operation: ");
scanf("%d", &operation);
/*case 1: coding of the switch statement*/
case 2: //here
if(!isEmpty(aPtr)){ //if list is not empty
aaPtr = NULL;
print("%s", "Enter title of the book to delete:\n");
scanf("%s", &strtitle);
aCollection.collection = strtitle;
delete(strtitle);
printf("The book %s has been removed from the library.", aBook.title);
fprintf(cfPtr, "The book %s has been removed from the library.", aBook.title);
}
else{
printf("Item not found!");
}
else{
puts("List is empty.\n");
}
}
break;
/*
```

I would like to delete a book from the collection by a particular title
from my library if the user enters 2 as input for my switch statement. How can I do that with my current code?
```#include<stdio.h>
#include<stdlib.h>
#define MAX 49
//void addBook(struct library* thislib){
//}
struct book{
char *title;
char *author;
char *subject; //subject[]
};
struct library {
struct book collection;
int num_books;
struct library *next; //store address of next node
};
struct book collection; //supposed to be aBook
struct book *aPtr;
struct library aCollection;
struct library *aaPtr;
int main (void){
FILE *cfPtr; //pointer points to the newly created file
char strtitle[MAX];
char strauthor[MAX];
char strsubject[MAX];
int operation;
if ((cfPtr = fopen("library.dat","w")) == NULL){
printf("File could not be opened...\n");
}
else {
while (!feof()){
operate();
printf("Enter an operation: ");
scanf("%d", &operation);
/*case 1: coding of the switch statement*/
case 2: //here
if(!isEmpty(aPtr)){ //if list is not empty
aaPtr = NULL;
print("%s", "Enter title of the book to delete:\n");
scanf("%s", &strtitle);
aCollection.collection = strtitle;
delete(strtitle);
printf("The book %s has been removed from the library.", aBook.title);
fprintf(cfPtr, "The book %s has been removed from the library.", aBook.title);
}
else{
printf("Item not found!");
}
else{
puts("List is empty.\n");
}
}
break;
/*
```

#1: Initial revision by

hamburgersarecool‭ · 2021-12-09T14:06:39Z (almost 3 years ago)

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How can I delete a book from the collection by a particular title from my library file?

I would like to delete a book from the collection by a particular title
from my library, as Case 2 of my switch statement. How can I do that with my current code?

```#include<stdio.h>
#include<stdlib.h>
#define MAX 49
//void addBook(struct library* thislib){
//}
struct book{
     char *title;
     char *author;
     char *subject; //subject[]
};

struct library {
    struct book collection;
    int num_books;
    struct library *next; //store address of next node
};

struct book collection; //supposed to be aBook
struct book *aPtr;
struct library aCollection;
struct library *aaPtr;

int main (void){
    
   FILE *cfPtr; //pointer points to the newly created file

   char strtitle[MAX]; 
   char strauthor[MAX];
   char strsubject[MAX];
   int operation;

   
    if ((cfPtr = fopen("library.dat","w")) == NULL){
        printf("File could not be opened...\n");
    }
   else {

       while (!feof()){
        operate();
        printf("Enter an operation: ");
        scanf("%d", &operation);

          /*case 1: coding of the switch statement*/

            case 2: //here
            if(!isEmpty(aPtr)){ //if list is not empty
                aaPtr = NULL;
                print("%s", "Enter title of the book to delete:\n");
                scanf("%s", &strtitle);

                aCollection.collection = strtitle;
                delete(strtitle);
                printf("The book %s has been removed from the library.", aBook.title);
                fprintf(cfPtr, "The book %s has been removed from the library.", aBook.title);
                }
                else{
                    printf("Item not found!");
                }
                else{
                    puts("List is empty.\n");
                }
            }
            break;
/*
```

c data-structures file-format linked-list filestream

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