#include <stdio.h>
#include <stdlib.h>
int compareNumbers(int number1, int number2);
typedef struct Book
{
    char author[100];
    char title[100];
    int yearOfPublication;
    int numberOfPages;
} Book;

int main(int argc, char* argv[])
{
    char temp[100] ;
    FILE * fPointer;
    Book books[100];
    fPointer = fopen(argv[1], "r");
    int n = sizeof(books)/sizeof(Book);
    int i;
    while(!feof(fPointer))
    {

        for(i = 0; i < n; i++ )
        {
            fgets(books[i].author,150,fPointer);
            fgets(books[i].title,150,fPointer);
            fgets(temp,150,fPointer);
            books[i].yearOfPublication = atoi(temp);
            fgets(temp,150,fPointer);
            books[i].numberOfPages = atoi(temp);
            printf("cos");
        }
    }
    for(i = 0; i < n; i++ )
    {
        if( argv[2] == 'a')
        {
            qsort(books,n,sizeof(Book),strcmp(books[i].author,books[i + 1].author));

        }
        else if( argv[2] == 't')
        {
            qsort(books,n,sizeof(Book),strcmp(books[i].title,books[i + 1].title));
        }
        else if ( argv[2] == 'y')
        {
            qsort(books,n,sizeof(Book),compareNumbers(books[i].yearOfPublication,books[i + 1].yearOfPublication));

        }
    }

    for(i = 0; i < n; i++)
    {
        printf("Author: %s\nTitle: %s\nYear of publication:%d\nNumber of pages: %d\n\n",books[i].author,books[i].title,books[i].yearOfPublication,books[i].numberOfPages);
    }

    return 0;
}
int compareNumbers(int number1, int number2)
{
    if(number1 < number2)
        return -1;
    else
        return 0;
}
y