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

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

struct sequence
{
    float data;
    struct sequence* link;
};
struct sequenceVnesh
{
    struct sequence* point;
    struct sequenceVnesh* link;
};

void changeValue(struct sequence** temp)
{
    if(*temp == NULL)
    {
        printf("Add new element\n\n");
    }
    else{
        printf("Enter the new value for data:\n\n");
        struct sequence *temp1 = *temp;
        scanf("%f", &temp1 -> data);
    }
}

void pointerToBegin(struct sequence** head, struct sequence** temp)
{
    *temp = *head;
}

void skipElem(struct sequence** temp)
{

    if(*temp == NULL || (*temp) -> link == NULL )
    {
        printf("End's list or add new element\n\n");
        printf("[%d]\n\n",*temp);
    }
    else *temp = (*temp) -> link;
}

void showValue( struct sequence** temp)
{
    struct sequence* temp1 = *temp;
    if(temp1 == NULL) printf("Add new element\n\n");
    else  {
        //printf("%f\n\n",  (*temp) -> data );
    }

}

void makeEmpty(struct sequence** head)
{
    struct sequence* temp1 = *head;
    struct sequence* temp2;
    while( temp1 != NULL)
    {
        temp2 = temp1 -> link;
        free(temp1);
        temp1 = temp2;
    }
    *head = NULL;
}

void  beginWork(int* flag)
{
    *flag =  1;
}

void addToEnd(struct sequence** head, struct sequence** temp1){


    struct sequence *temp;
    temp = (struct sequence *) malloc(sizeof(struct sequence));

    printf("Enter the data:\n\n");
    scanf("%f", &temp->data);

    temp->link = NULL;

    if (*head == NULL)
    {
        *head = temp;
    }
    else
    {
        struct sequence *p;

        p = *head;

        while (p->link != NULL)
        {
            p = p->link;
        }

        p->link = temp;
    }
    if(*temp1 == NULL) *temp1 = *head;
}

void print(struct sequence** head)
{
    struct sequence* p;
    p = *head;

    while(p!=NULL)
    {
        printf("%f  ", p -> data);
        p = p -> link;
    }
    printf("\n\n");
    if(*head == NULL) printf("List is empty\n\n");
}

void over()
{
    exit(1);
}

void isEmpty(struct sequence** head)
{
    if(*head == NULL) printf("List is empty\n\n");
    else printf("List is not empty\n\n");
}

void check(struct sequence** temp)
{
    if((*temp) -> link == NULL)
        printf("All elements are read\n\n");
    else printf("We have unread elements\n\n");
}

void readElem(struct sequence** temp, struct sequence** head)
{

    if(*head == NULL) printf("List is empty\n\n");
    else {
        printf("Read element: %f\n\n", (*temp)->data);
        if ((*temp)->link == NULL) {
            printf("End's list or add new element\n\n");
        } else {

            *temp = (*temp)->link;

        }
    }

}

int main()
{
    int value;
    int flag = 0;

    struct sequence* head = NULL;
    struct sequence* temp = head;

    while(1)
    {

        printf("1.  NAchati raboty.\n");
        printf("2   Sdelati posl pystoi.\n");
        printf("3.  Pystaya li posl ?\n");
        printf("4.  pokazati znachenie ocherednogo elementa\n");
        printf("5.  Propystiti ocherednoi element\n");
        printf("6.  Prochitati ocherednoi element posl\n");
        printf("7.  Izmeniti znachenie ocherednogo elementa\n");
        printf("8.  Dobaviti element v konec\n");
        printf("9.  ykazatel ocherednogo element v nachalo\n");
        printf("10  Proveriti - ecti ili net neprochitannie elemnts\n");
        printf("11. Pacpechatati posl \n");
        printf("12. Konec raboty\n\n");

        printf("Vibirite punkt\n");
        scanf("%d",&value);

        switch (value)
        {
            case 1: beginWork(&flag);
                break;

            case 2: if(flag == 1)
            {
                makeEmpty(&head);
                break;
            } else {printf("Nachat raboty\n\n"); break;}

            case 3: if(flag == 1)
            {
                isEmpty(&head);
                break;
            } else  {printf("Nachat raboty\n\n"); break;}

            case 4: if(flag == 1)
            {
                showValue(&temp);
                break;
            } else  {printf("Nachat raboty\n\n"); break;}

            case 5: if(flag == 1)
            {
                skipElem(&temp);
                break;
            } else  {printf("Nachat raboty\n\n"); break;}

            case 6:  if(flag == 1)
            {
                readElem(&temp,&head);
                break;
            }
            else  {printf("Nachat raboty\n\n"); break;}
            case 7: if(flag == 1)
            {
                changeValue(&temp);
                break;
            } else  {printf("Nachat raboty\n\n"); break;}

            case 8: if(flag == 1)
            {
                addToEnd(&head, &temp);
                break;
            }   else  {printf("Nachat raboty\n\n"); break;}
            case 9: if(flag == 1)
            {
                pointerToBegin(&head, &temp);
                break;
            }else  {printf("Nachat raboty\n\n"); break;}

            case 10: if(flag == 1)
            {
                check(&temp);
                break;
            }else  {printf("Nachat raboty\n\n"); break;}

            case 11: if(flag == 1)
            {
                print(&head);
                break;
            } else {printf("Nachat raboty\n\n"); break;}

            case 12: if(flag == 1) over();
            else {printf("Nachat raboty\n\n"); break;}

        }
    }
}