Error expected expression before struct - c

Question

The errors that prevent my code from compiling are:
[Error] expected identifier or '(' before '.' token
[Error] expected expression before 'books'
[Error] too few arguments to function 'fread'
I'm new to C programming and programming altogether. Although I'm used to Pascal. The errors occur in all functions except in the main and void menu. This is only a part of my code.
Please can someone help me in solving these errors this program.
#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <ctype.h>
char catergories[][15]={"Computer","Philosophy","Arts","Literature","Science","History"};
void menu(void);
void addbooks(void);
void deletebooks(void);
void updatebooks(void);
void findbooks(void);
void sellbooks(void);
void viewbooks(void);
int enterinfo();
int checkid(int);
void Password();
//list of global files that can be accessed from anywhere in program
FILE *fp,*ft,*fs;
//list of global variable
int s;
char findbook;
char password[10]={"dominique"};
typedef struct
{
int mm,dd,yy;
}OrderDate;
typedef struct
{
int id;
char name[35];
char author[35];
int quantity;
float price;
int count;
int shelf;
char *cat;
struct OrderDate *sold;
}books;
void addbooks(void) //funtion that add books
{
system("cls");
int i;
struct books;
printf("\n ******************************************************\n");
printf("\n \t\t ADD A BOOK");
printf("\n ******************************************************\n\n");
printf("\n SELECT THE CATERGORY OF THE BOOK:");
printf("\n 1. Computer Science, Information & General Works");
printf("\n 2. Philosophy, Psychology and Religion");
printf("\n 3. Arts and Recreation");
printf("\n 4. Literature");
printf("\n 5. Science");
printf("\n 6. History and Geography");
printf("\n 7. Back to main menu\n");
printf("\n Enter your choice:");
scanf("%d",&s);
if(s==7)
{
menu() ;
}
system("cls");
fp=fopen("BookRecords.txt","ab+");
if(enterinfo()==1)
{
books.cat=catergories[s-1]; //the error that exists here states expected identifier or '(' before '.' token
fseek(fp,0,SEEK_END);
fwrite(&books,sizeof(books),1,fp); //the error that exists here states expected expression before 'books'
fclose(fp);
printf("\n The book's information has been saved sucessfully");
printf("\n Would you like to save more information? (Y/N):");
if(getch()=='n')
{
menu();
}
else
system("cls");
addbooks();
}
}

Answer 1

struct books;
books is your type name. Like int or char. Thats why books.id==d won't work. You have to declare variable that is type of books. For example:
books BooksInMyShop;
Now you can use your variable in code ex.:
if(BooksInMyShop.id == currentId)
PS1: When You define:
typedef struct
{
(...)
}books;
You dont need to declare variable by struct books BooksInMyShop; simple books BooksInMyShop; will work now.
PS2: I can see in your code lots of missconceptions. For example "variable" books in every function in not shared beetween them. I guess You have to pass one instance of Your bookstore to every function or have one static global instance.