Structures - LabApakk1

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

typedef struct car
{
    char brand[64];
    char surname[64];
    int year, num;
} car;

int main(void)
{
    car *cars;
    int n, i, j, k, *eq, ei = 0;

    printf("input n: "); scanf("%d", &n);
    cars = (car*)malloc(sizeof(car) * n);
    fflush(stdin);

    for (i = 0; i < n; i++)
    {
        printf("Input brand and surname: "); scanf("%s %s", cars[i].brand, cars[i].surname);
        printf("Input year and num: "); scanf("%d %d", &cars[i].year, &cars[i].num);
    }


        for (i = 1; i < n; i++)
        {
            car key = cars[i];
            j = i - 1;
            while (j >= 0 && cars[j].year > key.year)
            {
                cars[j + 1] = cars[j];
                j--;
            }
            cars[j + 1] = key;
        }

        for (i = 0; i < n; i++)
        {
            int tmp = cars[i].num, co = 0, cn = 0;
            while (tmp)
            {
                if (tmp % 10 == 1) co++;
                if (tmp % 10 == 9) cn++;
                tmp = tmp / 10;
            }

            if (co && cn)
                printf("%s %s %d %d\n", cars[i].brand, cars[i].surname, cars[i].year, cars[i].num);
        }

    free(cars);

    _getch();
    return 0;
}