nig.c

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct book_s {
    char author[128];
    char name[128];
    unsigned int year;
    unsigned int value;
    struct book_s *next;
};

int main(void)
{
    printf("Lab. work #4. Task 1: Structures!\n");
    printf("Student: Kirill Pomelov, RI-100007\n\n");

    unsigned int count;
    printf("count = ");
    scanf("%u", &count);

    struct book_s *books = (struct book_s *)calloc(count, sizeof(struct book_s));
    for(unsigned int i = 0; i < count; i++) {
        unsigned int ip = i + 1;
        
        printf("Book #%u's author: ", ip);
        fflush(stdin);
        fgets(books[i].author, 128, stdin);
        books[i].author[strcspn(books[i].author, "\n")] = 0;
        printf("Book #%u's name: ", ip);
        fflush(stdin);
        fgets(books[i].name, 128, stdin);
        books[i].name[strcspn(books[i].name, "\n")] = 0;
        printf("Book #%u's year: ", ip); scanf("%u", &books[i].year);
        printf("Book #%u's value: ", ip); scanf("%u", &books[i].value);
        books[i].next = NULL;
    }

    printf("\n\nSearch books:\n");

    char ta[128] = { 0 };
    printf("Author: ");
    fflush(stdin);
    fgets(ta, 128, stdin);
    ta[strcspn(ta, "\n")] = 0;

    unsigned int year;
    printf("Year: ");
    scanf("%u", &year);

    struct book_s *cur = NULL;
    struct book_s *book = &books[0];
    for(unsigned int i = 0; i < count; i++) {
        if(strcmp(book->author, ta) == 0 && book->year <= year) {
            if(!cur) cur = book;
            else {
                struct book_s *end = cur;
                while(end->next) end++;
                end->next = book;
            }
        }
        book++;
    }

    while(cur) {
        printf("Book: \"%s\" by %s (%u)\n", cur->name, cur->author, cur->year);
        cur = cur->next;
    }

    return 0;
}