Курсовая работа: Списки стеки очереди в C

#include <stdio.h>

#include <stdlib.h>

#include <conio.h>

struct queueNode {

char data;

struct queueNode *nextPtr; };

typedef struct queueNode QUEUENODE;

typedef queueNode *QUEUENODEPTR;

/* function prototypes */

void printQueue(QUEUENODEPTR);

int isEmpty(QUEUENODEPTR);

char dequeue(QUEUENODEPTR *, QUEUENODEPTR *);

void enqueue (QUEUENODEPTR *, QUEUENODEPTR *, char);

void instructions (void);

using std::cout;

using std::endl;

main () {

QUEUENODEPTR headPtr = NULL, tailPtr = NULL;

int choice;

char item;

instructions ();

printf ("? ");

scanf("%d", &choice);

while (choice !=3) { switch(choice) {

case 1 :

printf("Enter a character: ");

scanf("\n%c", &item);

enqueue(&headPtr, &tailPtr, item);

printQueue(headPtr);