#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
typedef struct Element{
    int dane;
    struct Element * nast;
}Element;

struct Handler{
    Element *beg,*end;
};

void push_back(struct Handler *h,int value)
{
    Element * nowy;
    nowy =malloc(sizeof(Element));
    nowy->dane=value;
    nowy->nast=NULL;

    if(h->beg==NULL){
        h->beg=nowy;
        h->end=nowy;
    }
    else{
        ((h->end)->nast)=nowy;
        h->end=nowy;
    }
}

void push_front(struct Handler *h,int value)
{
    Element *nowy=(Element *)malloc(sizeof(Element));
    assert(nowy!=NULL);

    nowy->dane=value;
    if(h->beg!=NULL)
    {
        nowy->nast=h->beg;
        h->beg=nowy;
    }
    else
        nowy->nast=NULL;
        h->beg=nowy;
        h->end=nowy;
}

int *find(struct Handler *h,int find_value)
{
    Element *adres=h->beg;
    while(adres!= NULL)
    {
        if(adres->dane==find_value)
            return adres;
        adres=adres->nast;
    }
    return NULL;
}




int main()
{
    struct Handler handler;
    handler.beg=NULL;
    handler.end=NULL;
    push_front(&handler,9);
    push_back(&handler,11);
    push_back(&handler,12);
    push_back(&handler,13);
    push_front(&handler,10);
    Element *adres=handler.beg;

    while(adres!=NULL)
    {
        printf("%d \n",adres->dane);
        adres=adres->nast;

    }

    printf("\n \n ");

    printf("*%d = %d\n",find(&handler,12),*find(&handler,12));


    return 0;
}