cirkularni stog

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

typedef struct _cvor* Position;
typedef struct _cvor
{
    int broj;
    Position next;
}Cvor;

int Push(Position, int);
int Pop(Position);
int DodajNaPocetak(Position, Position);
Position GenerirajClan(int);
void Ispis(Position);
int VelicinaNiza(Position);
void IzbrisiZadnjeg(Position);

int main()
{
    Cvor stog;
    int maxElement;
    int unos = 0;
    srand((unsigned)time(NULL));

    stog.next = NULL;

    printf("Unesite maksimalni broj elemenata cirkularnog stoga:");
    scanf(" %d", &maxElement);

    while (unos != 4)
    {
        printf("Unesite 1 za push, 2 za pop, 3 za ispis liste, 4 za prekid: ");
        scanf(" %d", &unos);

        if (unos == 1)
            Push(&stog, maxElement);
        else if (unos == 2)
            Pop(&stog);
        else if (unos == 3)
            Ispis(stog.next);
        else if (unos != 4)
            printf("Pogresan unos!\n");
    }

    return 0;
}

int Push(Position head, int max)
{
    int temp;
    temp = rand() % (100 - 10 + 1) + 10;
    if(VelicinaNiza(head) < max)
        {
            DodajNaPocetak(head, GenerirajClan(temp));
        }
    else
        {
            DodajNaPocetak(head, GenerirajClan(temp));
            IzbrisiZadnjeg(head);
        }
    return 0;
}

int Pop(Position head)
{
    head->next = head->next->next;
    return 0;
}

int DodajNaPocetak(Position head, Position novi)
{
    novi->next = head->next;
    head->next = novi;

    return 0;
}

Position GenerirajClan(int broj)
{
    Position noviCvor;
    noviCvor = (Position)malloc(sizeof(Cvor));
    noviCvor->broj = broj;
    noviCvor->next = NULL;

    return noviCvor;
}

void Ispis(Position position)
{
    while (position != NULL)
    {
        printf("%d ", position->broj);
        position = position->next;
    }
    printf("\n");
}

int VelicinaNiza(Position head)
{
    int counter = 0;
    while (head->next != NULL)
    {
        counter++;
        head = head->next;
    }
    return counter;
}

void IzbrisiZadnjeg(Position head)
{
    while (head->next->next != NULL)
    {
        head = head->next;
    }
    head->next = NULL;
}