// Pantea Aria


// Imagine you are designing a program for a small library system. 

// Each book has an ID number (an int), 
// a price (a double), 
// and a category (a char) that tells you whether the book is 
// fiction ('F'), 
// non-fiction ('N'), 
// or a textbook ('T').

// Write a program to store the information of one book: 
// "C Programming Basics", which is a textbook with ID 1091 and costs 59.99.


// define your new type - only declaration
// struct book
struct book {
    int id;
    double price;
    char category;
};
// we have not declared a variable of type struct book yet

#include <stdio.h>
int main(void) {
    // declare a variable of type book
    struct book new_book, old_book;

    // textbook with ID 1091 and costs 59.99.
    new_book.id = 1091;
    new_book.price = 59.99;
    new_book.category = 'T';
    // print out double the price of this book
    printf("double the price is %lf\n", new_book.price * 2);





    
    

}