1. When I try to add onto a file that I created, it works fine, but when I reopen that file it comes up with this.
PLEASE HELP ME!!!
Then, author and genre do the same thing
Here is what my code looks like...
/* Lab E */
/************************ Library *****************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/************************ Function Decleration **************************/
void organize(struct books [], int, FILE *, char[]);
struct books input();
struct books
{
char title[40];
char author[30];
char genre[25];
int pages;
int rank;
}
/************************ Main Function ***************************/
main()
{
FILE *fp;
struct books book[30];
int index = 0;
char repeat;
char filename[25];
char filename2[25];
int choice;
int choice2;
printf("What would you like to do? ");
printf("\n1. Create a new file");
printf("\n2. Open a previous file");
printf("\n3. Add onto a previous file\n\n");
scanf("%d",&choice);
getchar();
if(choice == 1)
{
printf("\n\nEnter in a new file name: ");
gets(filename);
if((fp = fopen(filename, "w")) == NULL)
{
puts("Cannot open the file");
exit(1);
}
}
else if(choice == 2)
{
printf("What file name would you like to open?: ");
gets(filename);
if((fp = fopen(filename, "r")) == NULL)
{
puts("Cannot open the file");
exit(1);
}
while(fread(&book[index], sizeof(book[index]), 1, fp)==1)
{
printf("\nTitle: %s\n", book[index].title);
printf("Author %s\n", book[index].author);
printf("Genre: %s\n", book[index].genre);
printf("Pages: %d\n", book[index].pages);
printf("Rank: %d\n", book[index].rank);
}
fclose(fp);
}
else if(choice == 3)
{
printf("What file name would you like to add onto?: ");
gets(filename);
if((fp = fopen(filename, "r")) == NULL)
{
puts("Cannot open the file");
exit(1);
}
while(fread(&book[index], sizeof(book[index]), 1, fp)==1)
{
index++;
}
fclose(fp);
printf("\n\nWhat would you like to do?: ");
printf("\n1. Overwrite the file");
printf("\n2. Add onto the previous file\n\n");
scanf("%d",&choice2);
if(choice2 == 1)
{
printf("Enter in the file name: ");
getchar();
gets(filename2);
if((fp = fopen(filename, "w")) == NULL)
{
puts("Cannot open the file");
exit(1);
}
}
else if(choice2 == 2)
{
printf("Enter in the file name: ");
getchar();
gets(filename2);
if((fp = fopen(filename2, "r")) == NULL)
{
puts("Cannot open the file");
exit(1);
}
index = 0;
while(fread(&book[index], sizeof(book[index]), 1, fp)==1)
{
index++;
}
fclose(fp); // closing the reading function
if((fp = fopen(filename2, "w")) == NULL)
{
puts("Cannot open the file");
exit(1);
}
do
{
input(book[index]);
fwrite(&book[index], sizeof(book[index]), 1, fp);
printf("\n\nDo you want to enter in another book?: ");
getchar();
scanf("%c",&repeat);
getchar();
}
while(repeat == 'y' || repeat == 'Y');
fclose(fp);//closing the writing function
}
}
do
{
book[index] = input();
printf("\n\n\nTitle: %s", book[index].title);
printf("\nAuthor: %s", book[index].author);
printf("\nGenre: %s", book[index].genre);
printf("\nPages: %d", book[index].pages);
printf("\nRank: %d", book[index].rank);
fwrite(&book[index], sizeof(book[index]), 1, fp);
index++;
printf("\n\nDo you want to enter in another book?: ");
getchar();
scanf("%c",&repeat);
getchar();
printf("_______________________________________________________\n");
}
while(repeat == 'y' || repeat == 'Y');
fclose(fp);
organize(book, index, fp, filename);
}
/*************************** Sort the Books *****************************/
void organize(struct books book1[30], int index1, FILE *fp, char filename[25])
{
int index = 0;
int pass;
int choice = 0;
int booknum = 0;
struct books temp;
printf("\n\nHow would you like these organized?");
printf("\n1. Author");
printf("\n2. Genre");
printf("\n3. # of Pages");
printf("\nType 1, 2, or 3: ");
scanf("%d",&choice);
if (choice == 1)
{
for(pass = 1; pass < index1; pass++)
for(index = 0; index < index1; index++)
if(strcmp(book1[index].author, book1[index+1].author)>0)
{
temp = book1[index];
book1[index] = book1[index + 1];
book1[index + 1] = temp;
}
for (index = 0; index < index1; index++)
printf("\n\n\tAuthor: %s\n\tTitle: %s\n\tGenre: %s\n\tPages: %d\n\tRank: %d", book1[index].author, book1[index].title, book1[index].genre, book1[index].pages, book1[index].rank);
}
else if (choice == 2)
{
for(pass = 1; pass < index ; pass++)
for(index = 0; index < index1-1; index++)
if(strcmp(book1[index].genre, book1[index+1].genre)>0)
{
temp = book1[index];
book1[index] = book1[index + 1];
book1[index + 1] = temp;
}
for (index = 0; index < index1; index++)
printf("\n\n\tGenre: %s\n\tTitle: %s\n\tAuthor: %s\n\tPages: %d\n\tRank:%d", book1[index].genre, book1[index].title, book1[index].author, book1[index].pages, book1[index].rank);
}
else if (choice == 3)
{
for(pass = 1; pass < index ; pass++)
for(index = 0; index < index1; index++)
if(book1[index].pages > book1[index+1].pages)
{
temp = book1[index];
book1[index] = book1[index + 1];
book1[index + 1] = temp;
}
for (index = 0; index < index1; index++)
printf("\n\n\tPages: %d\n\tTitle: %s\n\tGenre: %s\n\tAuthor: %s\n\tRank: %d", book1[index].pages, book1[index].title, book1[index].genre, book1[index].author, book1[index].rank);
}
}
/************************** Input Function ***************************/
struct books input()
{
struct books book;
printf(" Book Organizer\n");
printf("\nEnter in the book title: ");
gets(book.title);
printf("Enter in the book author: ");
gets(book.author);
printf("Enter in the genre: ");
gets(book.genre);
printf("Enter in the number of pages: ");
scanf("%d",&book.pages);
do
{
printf("Enter in the book ranking (1-10): ");
scanf("%d",&book.rank);
}
while(book.rank < 0 || book.rank > 11);
return(book);
}
