bk

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#include <stdio.h>

int ISBN13 (char kod[]) {

    int i = 0, j= 0, error = 0, brojZnamenki = 0, brojMinusa = 0, drugaGrupa = 0, trecaGrupa = 0, cetvrtaGrupa = 0, zbroj = 0;
    char brojevi[13];

    for(i=0; kod[i] != '\0';i++)
        {
            brojZnamenki ++;

            if (kod[i] == '-')
            {
                brojMinusa++;
            }

                if (kod[i] != '-')
            {
                brojevi[j] = kod[i];
                j++;
            }
        }

       if (brojZnamenki < 5 || brojZnamenki > 5 )
        {
            error = 1;
            return error;
        }

        for(i=0; kod[i] != '\0';i++)
        {
        if  ((kod[i] >= 'A' && kod[i] <= 'Z') || (kod[i] >= 'a' && kod[i] <= 'z'))
                {
            error = 2;
            return error;
        }
        }

    return error;
}
    int main(void) {

        char a[50];
        int i;
        printf ("Unesite kod: ");
        scanf ("%s", &a[i]);

        printf ("\nKod pogreske: %d \n", ISBN13(a));

        switch (ISBN13(a)){
        case 1:
            printf ("Ukupan broj znakova nije ispravan");
            break;
        case 2:
            printf ("ima slovo ne valja");
            break;
        case 0:
            printf("ISBN broj je ispravan!");
            break;

        }
    }