typedef

1#include <stdio.h>
2#include <string.h>
3 
4typedef struct Books {
5   char title[50];
6   char author[50];
7   char subject[100];
8   int book_id;
9} Book;
10 
11int main( ) {
12
13   Book book;
14 
15   strcpy( book.title, "C Programming");
16   strcpy( book.author, "Nuha Ali"); 
17   strcpy( book.subject, "C Programming Tutorial");
18   book.book_id = 6495407;
19 
20   printf( "Book title : %s\n", book.title);
21   printf( "Book author : %s\n", book.author);
22   printf( "Book subject : %s\n", book.subject);
23   printf( "Book book_id : %d\n", book.book_id);
24
25   return 0;
26}

1// typedef [type] [alias]
2// Example:
3typedef unsigned long int ulong;
4
5ulong someNumber = 158426;

1// Typedefs can also simplify definitions or declarations for structure pointer types. Consider this:
2
3struct Node {
4    int data;
5    struct Node *nextptr;
6};
7// Using typedef, the above code can be rewritten like this:
8
9typedef struct Node Node;
10
11struct Node {
12    int data;
13    Node *nextptr;
14};

1typedef int myint;
2

1- Type Names The command typedef can be used to give a short name to a data
2type. 
3- For example, the name long long is long, so we can define a short name
4ll
5typedef long long ll;

1typedef int tabla1N[N + 1];