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#include <stdio.h>

typedef char Item;

void STACKinit(int MaxN);
int STACKempty();
void STACKpush(Item item);
Item STACKpop();

Item *s;
int N;

int main(){

    int celeCislo, zvysokPoDeleni;
    printf("Zadaj prirodzene cislo v dekadickom tvare: ");
    scanf("%d", &celeCislo);
    STACKinit(10);
    while(celeCislo != 0)
    {
        zvysokPoDeleni = celeCislo % 16;
        celeCislo /= 16;
        if(zvysokPoDeleni >= 10)
        {
            STACKpush(zvysokPoDeleni-10+'A');
        }else{
            STACKpush(zvysokPoDeleni+'0');
        }
        while(!STACKempty())
        {
            printf("%c", STACKpop());
        }
    }

}

void STACKinit(int MaxN)
{
    if(!(s = malloc(MaxN * sizeof(Item))))
    {
        printf("Alokovanie pamate zlyhalo.");
    }
    N = 0;

}

int STACKempty()
{
    return N == 0;
}

void STACKpush(Item item)
{
    s[N++] = item;
}

Item STACKpop()
{
    return s[--N];
}