#include <iostream>

using namespace std;

typedef struct
{
    string id;
    string name;
    double price;
} book;

void swap(double &num1, double &num2)
{
    double temp = num1;
    num1 = num2;
    num2 = temp;
}

book sort(book &books)
{
    book new_books[100];
    
}