Books

#include <stdio.h>



///////////////////////////////////////
int main()
{

    int   in_stack =    0,
        total_cost =    0,
         book_cost = 1000,
       count_books       ;



    printf("Enter count of books: ");
    scanf("\n%d", &count_books);

    int i = 1;

    if(count_books < 0) printf("Wrong number.");
    else
    {
        for(; i <= count_books; i++)
        {

            total_cost  += book_cost;
            book_cost   -=  55;
            in_stack    ++    ;

            if(in_stack ==   7)
            {
               book_cost = 1000;
               in_stack  =    0;
            }
        }

        printf("%2i books = %d\n", i-1, total_cost);
    }

return 0;
}












/*

#include <stdio.h>

int main() {
    int count_books;
    int total_cost = 0, book_cost = 1000, in_stack = 0;
    printf("Enter count of books: ");
    scanf("\n%d", &count_books);

    if (count_books < 0) {printf("Wrong number.");}
    else {
        for (int i = 0; i <= count_books; i++) {
            printf("%i books = %d\n",i, total_cost);
            total_cost += book_cost;
            book_cost -= 55;
            in_stack++;
            if (in_stack == 7) {
                book_cost = 1000;
                in_stack = 0;
            }
        }
    }
    return 0;
}

*/