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82 changes: 44 additions & 38 deletions Queue/DoubleEndedQueue.c
Original file line number Diff line number Diff line change
Expand Up @@ -6,10 +6,10 @@ int a[20];

void enque_front(){
int ele;
printf("Enter the element");
printf("Enter the element: ");
scanf("%d",&ele);
if((front==0)&&(rear==MAX-1)||(rear+1)==front){
printf("Overflow");
printf("Overflow\n");
}
else if(front==-1&&rear==-1){
front=0;
Expand All @@ -30,11 +30,11 @@ void enque_front(){

void enque_rear(){
int ele;
printf("Enter the element");
printf("Enter the element: ");
scanf("%d",&ele);

if((front==0)&&(rear==MAX-1)||(rear+1)==front){
printf("Overflow");
printf("Overflow\n");
}
else if(front==-1&&rear==-1){
front=rear=0;
Expand All @@ -49,7 +49,7 @@ void enque_rear(){
void deque_rear(){ //rear
int item;
if((front==-1)&&(rear==-1)){
printf("Underflow");
printf("Underflow\n");
}
else if(front==rear){
item=a[rear];
Expand Down Expand Up @@ -82,47 +82,53 @@ void deque_front(){ //front
front=(front+1)%MAX;
}
}
void displayQueue(){
if(front==-1){
printf("Empty queue");
void displayQueue() {
if (front == -1) {
printf("The queue is empty.\n");
return;
}
printf("The queue is \n");
if(front<=rear){
for(int i=front;i<=rear;i++){
printf("%d\t",a[i]);
}
}else{
for(int i=front;i<MAX;i++){
printf("%d\t",a[i]);
}
for(int i=0;i<=rear;i++){
printf("%d\t",a[i]);
}
}

printf("\nQueue (Front to Rear):\n");
printf("Front -> ");

if (front <= rear) {
for (int i = front; i <= rear; i++) {
printf("%d, ", a[i]);
}
} else {
for (int i = front; i < MAX; i++) {
printf("%d, ", a[i]);
}
for (int i = 0; i <= rear; i++) {
printf("%d, ", a[i]);
}
}

printf("<- Rear\n");
}

void main()
{
int ch;

printf("Enter size");
printf("Enter size: ");
scanf("%d",&MAX);

do{
do{
printf("1.Insertion through Front- 2.Insertion through rear- 3.Deletion through front- 4.Deletion through rear 5.display \n");
scanf("%d",&ch);
switch(ch){
case 1:enque_front();
break;
case 2:enque_rear();
break;
case 3:deque_front();
break;
case 4:deque_rear();
break;
case 5:displayQueue();
break;
default:printf("Invalid");
}
}while(ch==1||ch==2||ch==3||ch==4||ch==5);
scanf("%d",&ch);
switch(ch){
case 1:enque_front();
break;
case 2:enque_rear();
break;
case 3:deque_front();
break;
case 4:deque_rear();
break;
case 5:displayQueue();
break;
default:printf("Invalid");
}
}while(ch>0 && ch<6);
}