entire e31 updated old one had error and was goofy

assignment-31.cpp

@@ -1,161 +1,172 @@
 #include<iostream>
 using namespace std;
 
-#define SIZE 5
-
-class Dequeue
+class deque1
 {
-
-    int a[10], front, rear, count;
-
 public:
-    Dequeue()
+    int f,r,data[100],n;
+    deque1()
     {
-        front = -1;
-        rear = -1;
-        count = 0;
+        f =  r = -1;
+        cout<<"Enter number of elements: ";
+        cin>>n;
     }
-    void addBegin(int item)
+    void enqueuef();
+    void enqueuer();
+    void dequeuef();
+    void dequeuer();
+    bool isEmpty();
+    bool isFull();
+    void display();
+};
+
+void deque1::enqueuef()
+{
+    int id;
+    cout<<"\nEnter element: ";
+    cin>>id;
+    if(!isFull())
+    {
+        if(f == -1)
+            f = r = 0;
+        else if(f == 0)
+            f = n - 1;
+        else
+            f--;
+        data[f] = id;
+    }
+    else
+        cout<<"\nQueue is full....\n";
+}
+
+void deque1::enqueuer()
+{
+    int id;
+    cout<<"\nEnter element: ";
+    cin>>id;
+    if(!isFull())
+    {
+        if(f == -1)
+            f = r = 0;
+        else if(r == n - 1)
+            r = 0;
+        else
+            r++;
+        data[r] = id;
+    }
+    else
+        cout<<"\nQueue is full....\n";
+}
+
+void deque1::dequeuef()
+{
+    if(!isEmpty())
+    {
+        if(f == r)
+            f = r = -1;
+        else if(f == n-1)
+            f = 0;
+        else
+            f++;
+    }
+    else
+        cout<<"\nQueue is empty....\n";
+}
+
+void deque1::dequeuer()
+{
+    if(!isEmpty())
+    {
+        if(f == r)
+            f = r = -1;
+        else if(r == 0)
+            r = n-1;
+        else
+            r--;
+    }
+    else
+        cout<<"\nQueue is empty....\n";
+}
+
+void deque1::display()
 {
     int i;
-        if (front == -1)
+    cout<<"\nDeque: ";
+    if(!isEmpty())
     {
-            front++;
-            rear++;
-            a[rear] = item;
-            count++;
-        }
-        else if (rear >= SIZE - 1)
+        i = f;
+        do
         {
-            cout << "\nInsertion is not possible,overflow!!!!";
+            cout<<data[i]<<" ";
+            i = (i+1)%n;
+        }while(i != (r+1)%n);
     }
     else
-        {
-            for (i = count; i >= 0; i--)
-            {
-                a[i] = a[i - 1];
+        cout<<"\nQueue is empty....\n";
+    cout<<"\n";
 }
-            a[i] = item;
-            count++;
-            rear++;
-        }
-    }
-    void addEnd(int item)
-    {
 
-        if (front == -1)
+bool deque1::isFull()
 {
-            front++;
-            rear++;
-            a[rear] = item;
-            count++;
-        }
-        else if (rear >= SIZE - 1)
-        {
-            cout << "\nInsertion is not possible,overflow!!!";
-            return;
-        }
+    if((f==0 && r >= n - 1)|| f==r+1)
+        return true;
     else
-        {
-            a[++rear] = item;
+        return false;
 }
-    }
-    void deleteFront()
-    {
-        if (front == -1)
-        {
-            cout << "Deletion is not possible:: Dequeue is empty";
-            return;
-        }
-        else
-        {
-            if (front == rear)
-            {
-                front = rear = -1;
-                return;
-            }
-            cout << "The deleted element is " << a[front];
-            front = front + 1;
-        }
-    }
-    void deleteEnd()
-    {
-        if (front == -1)
-        {
-            cout << "Deletion is not possible:Dequeue is empty";
-            return;
-        }
-        else
-        {
-            if (front == rear)
-            {
-                front = rear = -1;
-            }
-            cout << "The deleted element is " << a[rear];
-            rear = rear - 1;
-        }
-    }
-    void display()
-    {
 
-        for (int i = front; i <= rear; i++)
+bool deque1::isEmpty()
 {
-            cout << a[i] << " ";
+    if(r == -1)
+        return true;
+    else
+        return false;
 }
-    }
-};
 
 int main()
 {
-    int c, item;
-    Dequeue d1;
-
-    do
+    deque1 obj;
+    int ch;
+    bool flag = true;
+    while(flag)
     {
-        cout << "\n\n****DEQUEUE OPERATION****\n";
-        cout << "\n1-Insert at beginning";
-        cout << "\n2-Insert at end";
-        cout << "\n3_Display";
-        cout << "\n4_Deletion from front";
-        cout << "\n5-Deletion from rear";
-        cout << "\n6_Exit";
-        cout << "\nEnter your choice<1-6>:";
-        cin >> c;
-
-        switch (c)
+        cout<<"\n****YOUR CHOICES ARE****\n";
+        cout<<"\n1. Enqueue(at front) \n2. Enqueue(at rear) \n3. Dequeue(at front) \n4. Dequeue(at rear) \n5. Display queue \n6. Exit";
+        cout<<"\nEnter your choice: ";
+        cin>>ch;
+        switch(ch)
         {
         case 1:
-            cout << "Enter the element to be inserted:";
-            cin >> item;
-            d1.addBegin(item);
+            obj.enqueuef();
+            obj.display();
             break;
 
         case 2:
-            cout << "Enter the element to be inserted:";
-            cin >> item;
-            d1.addEnd(item);
+            obj.enqueuer();
+            obj.display();
             break;
 
         case 3:
-            d1.display();
+            obj.dequeuef();
+            obj.display();
             break;
 
         case 4:
-            d1.deleteFront();
+            obj.dequeuer();
+            obj.display();
             break;
+
         case 5:
-            d1.deleteEnd();
+            obj.display();
             break;
 
         case 6:
-            exit(1);
+            flag = false;
             break;
 
         default:
-            cout << "Invalid choice";
+            cout<<"\nEnter valid choice!!!\n";
             break;
         }
-
-    } while (c != 7);
+    }
     return 0;
 }