Queue Using LinkList

C/Queue Using LinkList.c

@@ -0,0 +1,106 @@
+#include<stdio.h>
+#include<stdlib.h>
+struct queue{
+    int data;
+    struct queue *next;
+};
+struct queue *front = NULL;
+struct queue *rear = NULL;
+typedef struct queue Queue;
+
+void Enqueue(Queue **front,Queue **rear,int Item)
+{
+    Queue *new = malloc(sizeof(Queue));
+    new->next=NULL;
+    new->data=Item;
+
+    if(*front == NULL && *rear == NULL)
+    {
+        *front = *rear = new;
+    }
+    else
+    {
+        (*rear)->next=new;
+        *rear=new;
+    }
+}
+
+int Dequeue(Queue **front,Queue **rear)
+{
+    Queue *temp;
+    if(*front == NULL)
+    {
+        printf("Queue is Empty can not Dequeue.\n");
+    }
+    else
+    {
+        temp = *front;
+        int Data;
+        if(*front == *rear)
+        {
+            *front = *rear = NULL;
+            free(temp);
+        }
+        else
+        {
+            int Item;
+            Item=(*front)->data;
+            (*front)=(*front)->next;
+            free(temp);
+            return Item;
+        }
+    }
+}
+
+void Display(Queue *front,Queue *rear)
+{
+    if(front==NULL && rear==NULL)
+    {
+        printf("Queue is Empty.\n");
+    }
+    else
+    {
+        while(front!=NULL)
+        {
+            printf("%d  ",front->data);
+            front=front->next;
+        }
+    }
+}
+
+void main()
+{
+    int ch;
+    int Data;
+    while(1)
+    {
+        printf("\nEnter 1:-Enqueue 2:-Dequeue 3:-Display 4:-Exit.\n");
+        printf("Enter your choice: ");
+        scanf("%d",&ch);
+        switch(ch)
+        {
+            case 1:
+            printf("Enter data to be inserted: ");
+            scanf("%d",&Data);
+            Enqueue(&front,&rear,Data);
+            Display(front,rear);
+            break;
+
+            case 2:
+            Dequeue(&front,&rear);
+            Display(front,rear);
+            break;
+
+            case 3:
+            Display(front,rear);
+            break;
+
+            case 4:
+            exit(0);
+            break;
+
+            default:
+            printf("Invalid Input.\n");
+        }
+    }
+}