Data_Structures/StackAndQueue/QueueMenu.cpp at main · StyNW7/Data_Structures · GitHub

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

structCustomer {

char name[101];
int priority;

	Customer *next, *prev;

} *head = NULL, *tail = NULL, *curr = NULL;


structCustomer *createNewNode (char name[], int priority){

structCustomer* temp = (structCustomer*) malloc (sizeof(structCustomer));

strcpy (temp->name, name);
 temp->priority = priority;

 temp->next = NULL;
 temp->prev = NULL;

return temp;

}


voidpush (Customer *node){

// Push One

if (head == NULL){
 head = tail = node;
 head->prev = NULL;
 tail->next = NULL;
	}

// Push Head

elseif (node->priority < head->priority){
 node->next = head;
 head->prev = node;
 head = node;
 head->prev = NULL;
	}

// Push Tail

elseif (node->priority >= tail->priority){
 node->prev = tail;
 tail->next = node;
 tail = node;
 tail->next = NULL;
	}

// Push Mid

else {

 curr = head;

while (curr->next->priority <= node->priority){
 curr = curr->next;
 }

 Customer *a = curr;
 Customer *b = curr->next;

 a->next = node;
 node->prev = a;

 node->next = b;
 b->prev = node;

	}

}


voidpop (Customer *node){

// Pop One

if (head == tail){
free (head);
 head = tail = NULL;
	}

else {

 head = head->next;
free (head->prev);
 head->prev = NULL;

	}

}


voidpopAll (){
while (head != NULL){
pop(head);
	}
}


intmain(){

int menu = 0;

do {

system ("cls");

// Title

puts ("==============================");
puts ("|SUNIB Restaurant Reservation|");
puts ("==============================");

puts ("\nWaiting Line:");

// Print Queue

int num = 1;
 curr = head;

if (curr == NULL){
printf ("Queue is empty!\n");
 }

else {
while (curr != NULL){
printf ("%d. %s\n", num, curr->name);
 curr = curr->next;
 num++;
 }
 }

// Menu

puts ("\n1. Add Customer to Queue");
puts ("2. Serve One");
puts ("3. Serve All");
puts ("4. Dismiss Queue");
puts ("0. Exit\n");

do {
printf (">> ");
scanf ("%d", &menu); getchar();
 }

while (menu < 0 || menu > 4);

if (menu == 1){

int priority;
char checker[21];
bool flag = false;
char name[101];

do {

system ("cls");
printf ("Input your Membership and Name (Membership [space] Name formatted): ");
scanf ("%s %s", checker, name); getchar();

if (strcmp (checker, "VVIP") == 0 || strcmp (checker, "VIP") == 0 || strcmp (checker, "Member") == 0 || strcmp (checker, "Guest") == 0){
 flag = true;
 }

 }

while (!flag);

if (strcmp (checker, "VVIP") == 0){
 priority = 0;
 }

elseif (strcmp (checker, "VIP") == 0){
 priority = 1;
 }

elseif (strcmp (checker, "Member") == 0){
 priority = 2;
 }

else {
 priority = 3;
 }

 Customer *node = createNewNode (name, priority);
push (node);

 }

elseif (menu == 2){

 curr = head;

if (curr == NULL){
printf ("\nThe queue is empty!");
getchar();
 }

else {
if (curr->priority == 0){
printf ("\nAttention! %s is being served at VVIP Table.", curr->name);
 }

elseif (curr->priority == 1) {
printf ("\nAttention! %s is being served at VIP Table.", curr->name);
 }

elseif (curr->priority == 2) {
printf ("\nAttention! Member %s is being served at Regular Table.", curr->name);
 }

elseif (curr->priority == 3) {
printf ("\nAttention! Guest %s is being served at Regular Table.", curr->name);
 }

getchar();

pop (curr);
 }

 }

elseif (menu == 3){

 curr = head;

if (curr == NULL){
printf ("\nThe queue is empty!");
getchar();
 }

else {
while (curr != NULL){

if (curr->priority == 0){
printf ("\nAttention! %s is being served at VVIP Table.", curr->name);
 }

elseif (curr->priority == 1) {
printf ("\nAttention! %s is being served at VIP Table.", curr->name);
 }

elseif (curr->priority == 2) {
printf ("\nAttention! Member %s is being served at Regular Table.", curr->name);
 }

elseif (curr->priority == 3) {
printf ("\nAttention! Guest %s is being served at Regular Table.", curr->name);
 }

 curr = curr->next;

 }

getchar();

popAll();
 }

 }

elseif (menu == 4){

printf ("\nEnd of the day :)");
getchar();

popAll();

 }

	}

while (menu != 0);

system ("cls");

printf ("Thank youu :)\n");

return0;
}