C programming. Can you modify this program? I want it to be saved when I add ite
ID: 3833887 • Letter: C
Question
C programming.
Can you modify this program? I want it to be saved when I add items so that next time I add new items, the old items and new items appear at the same time when I print all items.
Here is the program:
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct info
{
char title[20];
char author[20];
int year;
int no_pages;
struct info *next;
};
typedef struct info Info;
//declare functions to add t linked list, delete and print an item and print all items
void addItem(Info *list, Info item);
int findItem(Info *list, char *title);
void deleteItem(Info *list, char *title);
void printItem(Info *list,char *s);
void printAllItem(Info *list);
void sort(Info *list);
void add(Info **list, Info item);
int main()
{
Info *list = NULL;
Info item;
char choice = 'A',ch='Y';
char title[20];
do
{
printf("Enter action - (A)dd, (D)elete, (F)ind, (P)rint all ,(S)ort, (Q)uit: ");
//fflush(stdout);
scanf("%c", &choice);
fflush(stdin);
switch (choice)
{
case 'A':
printf("Enter the title to add : ");
//fflush(stdin);
//fflush(stdout);
gets(item.title);
printf("Enter the author : ");
gets(item.author);
printf("Enter the year was it published: ");
scanf("%d", &item.year);
fflush(stdin);
printf("Enter the number of pages : ");
scanf("%d", &item.no_pages);
fflush(stdin);
if (list == NULL)
{
list = (Info*)malloc(sizeof(Info));
strcpy(list->author, item.author);
strcpy(list->title, item.title);
list->year = item.year;
list->no_pages = item.no_pages;
list->next = NULL;
}
else
addItem(list, item);
break;
case 'D':
printf("Enter the title to delete an item : ");
//fflush(stdin);
gets(title);
deleteItem(list, title);
break;
case 'F':
printf("Enter the title to find : ");
fflush(stdin);
gets(title);
if (findItem(list, title))
{
printf("Item found ");
}
else
{
printf("I can't find that book. ");
}
break;
case 'P':
printAllItem(list);
break;
case 'S':
sort(list);
break;
case 'Q':
printf("Quit Application.....");
break;
default:
printf("Invalid option ");
break;
}
} while (choice != 'Q');
}
void add(Info **list, Info item)
{
*list = (Info*)malloc(sizeof(Info));
strcpy((*list)->title, item.title);
strcpy((*list)->author, item.author);
(*list)->year = item.year;
(*list)->no_pages = item.no_pages;
return;
}
void addItem(Info *list, Info item)
{
Info *newitem, *cur = list;
newitem = (Info*)malloc(sizeof(Info));
strcpy(newitem->title, item.title);
newitem->year = item.year;
strcpy(newitem->author, item.author);
newitem->no_pages = item.no_pages;
newitem->next = NULL;
if (list == NULL)
{
add(&list,item);
}
else
{
while (cur->next != NULL)
{
cur = cur->next;
}
cur->next = newitem;
}
}
int findItem(Info *list, char *title)
{
if (list == NULL)
{
printf("Cannt delete an item,list is empty ");
return 0;
}
Info *cur = list;
while (cur != NULL)
{
if (strcmp(cur->title, title) == 0)
{
return 1;
}
cur = cur->next;
}
return 0;
}
void deleteItem(Info *list, char *title)
{
Info *cur = list, *prev , *next = NULL;
if (list == NULL)
{
printf("Cannt delete an item,list is empty ");
return;
}
if (strcpy(list->title, title) == 0)
{
//found at first position delete and assign list next item
list = list->next;
free(cur);
return;
}
while (cur != NULL)
{
prev = cur;
if (cur->next != NULL)
next = cur->next;
if (strcpy(cur->title, title) == 0)
{
prev->next = next;
free(cur);
return;
}
cur = cur->next;
}
}
void printItem(Info *list,char *s)
{
Info *cur = list;
while (cur != NULL)
{
if (strcmp(cur->title, s) == 0)
{
printf("%s(%d) ", cur->title,cur->year);
printf(" %s ", cur->author);
//printf("Year: %d ", cur->year);
printf(" %d Pages ", cur->no_pages);
cur = cur->next;
}
}
}
void printAllItem(Info *list)
{
Info *cur = list;
while (cur != NULL)
{
printf("%s(%d) ", cur->title,cur->year);
printf(" %s ", cur->author);
printf(" %d Pages ", cur->no_pages);
cur = cur->next;
}
}
void sort(Info *list)
{
Info *cur = list,*next;
Info tmp;
while (cur != NULL)
{
if (cur->next != NULL)
{
next = cur->next;
if (strcmp(cur->title, next->title) > 0)
{
strcpy(tmp.title, cur->title);
strcpy(tmp.author, cur->author);
tmp.year = cur->year;
tmp.no_pages = cur->no_pages;
strcpy(cur->title, next->title);
strcpy(cur->author, next->author);
cur->year = next->year;
cur->no_pages = next->no_pages;
strcpy(next->title, tmp.title);
strcpy(next->author, tmp.author);
next->year = tmp.year;
next->no_pages = tmp.no_pages;
}
}
cur = cur->next;
}
}
Explanation / Answer
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct info
{
char title[20];
char author[20];
int year;
int no_pages;
struct info *next;
};
typedef struct info Info;
//declare functions to add t linked list, delete and print an item and print all items
void addItem(Info *list, Info item);
int findItem(Info *list, char *title);
void deleteItem(Info *list, char *title);
void printItem(Info *list,char *s);
void printAllItem(Info *list);
void sort(Info *list);
void add(Info **list, Info item);
int main()
{
Info *list = NULL;
Info item;
char choice = 'A',ch='Y';
char title[20];
do
{
printf("Enter action - (A)dd, (D)elete, (F)ind, (P)rint all ,(S)ort, (Q)uit: ");
//fflush(stdout);
scanf("%c", &choice);
fflush(stdin);
switch (choice)
{
case 'A':
printf("Enter the title to add : ");
//fflush(stdin);
//fflush(stdout);
gets(item.title);
printf("Enter the author : ");
gets(item.author);
printf("Enter the year was it published: ");
scanf("%d", &item.year);
fflush(stdin);
printf("Enter the number of pages : ");
scanf("%d", &item.no_pages);
fflush(stdin);
if (list == NULL)
{
list = (Info*)malloc(sizeof(Info));
strcpy(list->author, item.author);
strcpy(list->title, item.title);
list->year = item.year;
list->no_pages = item.no_pages;
list->next = NULL;
}
else
addItem(list, item);
break;
case 'D':
printf("Enter the title to delete an item : ");
//fflush(stdin);
gets(title);
deleteItem(list, title);
break;
case 'F':
printf("Enter the title to find : ");
fflush(stdin);
gets(title);
if (findItem(list, title))
{
printf("Item found ");
}
else
{
printf("I can't find that book. ");
}
break;
case 'P':
printAllItem(list);
break;
case 'S':
sort(list);
break;
case 'Q':
printf("Quit Application.....");
break;
default:
printf("Invalid option ");
break;
}
} while (choice != 'Q');
}
void add(Info **list, Info item)
{
*list = (Info*)malloc(sizeof(Info));
strcpy((*list)->title, item.title);
strcpy((*list)->author, item.author);
(*list)->year = item.year;
(*list)->no_pages = item.no_pages;
return;
}
void addItem(Info *list, Info item)
{
Info *newitem, *cur = list;
newitem = (Info*)malloc(sizeof(Info));
strcpy(newitem->title, item.title);
newitem->year = item.year;
strcpy(newitem->author, item.author);
newitem->no_pages = item.no_pages;
newitem->next = NULL;
if (list == NULL)
{
add(&list,item);
}
else
{
while (cur->next != NULL)
{
cur = cur->next;
}
cur->next = newitem;
}
}
int findItem(Info *list, char *title)
{
if (list == NULL)
{
printf("Cannt delete an item,list is empty ");
return 0;
}
Info *cur = list;
while (cur != NULL)
{
if (strcmp(cur->title, title) == 0)
{
return 1;
}
cur = cur->next;
}
return 0;
}
void deleteItem(Info *list, char *title)
{
Info *cur = list, *prev , *next = NULL;
if (list == NULL)
{
printf("Cannt delete an item,list is empty ");
return;
}
if (strcpy(list->title, title) == 0)
{
//found at first position delete and assign list next item
list = list->next;
free(cur);
return;
}
while (cur != NULL)
{
prev = cur;
if (cur->next != NULL)
next = cur->next;
if (strcpy(cur->title, title) == 0)
{
prev->next = next;
free(cur);
return;
}
cur = cur->next;
}
}
void printItem(Info *list,char *s)
{
Info *cur = list;
while (cur != NULL)
{
if (strcmp(cur->title, s) == 0)
{
printf("%s(%d) ", cur->title,cur->year);
printf(" %s ", cur->author);
//printf("Year: %d ", cur->year);
printf(" %d Pages ", cur->no_pages);
cur = cur->next;
}
}
}
void printAllItem(Info *list)
{
Info *cur = list;
while (cur != NULL)
{
printf("%s(%d) ", cur->title,cur->year);
printf(" %s ", cur->author);
printf(" %d Pages ", cur->no_pages);
cur = cur->next;
}
}
void sort(Info *list)
{
Info *cur = list,*next;
Info tmp;
while (cur != NULL)
{
if (cur->next != NULL)
{
next = cur->next;
if (strcmp(cur->title, next->title) > 0)
{
strcpy(tmp.title, cur->title);
strcpy(tmp.author, cur->author);
tmp.year = cur->year;
tmp.no_pages = cur->no_pages;
strcpy(cur->title, next->title);
strcpy(cur->author, next->author);
cur->year = next->year;
cur->no_pages = next->no_pages;
strcpy(next->title, tmp.title);
strcpy(next->author, tmp.author);
next->year = tmp.year;
next->no_pages = tmp.no_pages;
}
}
cur = cur->next;
}
}
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