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strcpy( book.author, "Nuha Ali");

strcpy( book.subject, "C Programming Tutorial");

book.book_id = 6495407;

printf( "Book title : %s\n", book.title);

printf( "Book author : %s\n", book.author);
printf( "Book subject : %s\n", book.subject);

printf( "Book book_id : %d\n", book.book_id);

return 0;
}

When the above code is compiled and executed, it produces the following result:

Book title : C Programming

Book author : Nuha Ali
Book subject : C Programming Tutorial

Book book_id : 6495407

typedef vs #define
#define is a C-directive which is also used to define the aliases for various data types
similar to typedef but with the following differences:
 typedef is limited to giving symbolic names to types only, whereas
#define can be used to define alias for values as well, e.g., you can define 1 as ONE, etc.
 typedef interpretation is performed by the compiler whereas #define
statements are processed by the preprocessor.
The following example shows how to use #define in a program:

#include <stdio.h>

#define TRUE 1

#define FALSE 0

int main( )
{

printf( "Value of TRUE : %d\n", TRUE);

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