Create circulaqueue.c++

circulaqueue.c++

@@ -0,0 +1,134 @@
+// C or C++ program for insertion and 
+// deletion in Circular Queue 
+#include<bits/stdc++.h> 
+using namespace std; 
+
+struct Queue 
+{ 
+	// Initialize front and rear 
+	int rear, front; 
+
+	// Circular Queue 
+	int size; 
+	int *arr; 
+
+	Queue(int s) 
+	{ 
+	front = rear = -1; 
+	size = s; 
+	arr = new int[s]; 
+	} 
+
+	void enQueue(int value); 
+	int deQueue(); 
+	void displayQueue(); 
+}; 
+
+
+/* Function to create Circular queue */
+void Queue::enQueue(int value) 
+{ 
+	if ((front == 0 && rear == size-1) || 
+			(rear == (front-1)%(size-1))) 
+	{ 
+		printf("\nQueue is Full"); 
+		return; 
+	} 
+
+	else if (front == -1) /* Insert First Element */
+	{ 
+		front = rear = 0; 
+		arr[rear] = value; 
+	} 
+
+	else if (rear == size-1 && front != 0) 
+	{ 
+		rear = 0; 
+		arr[rear] = value; 
+	} 
+
+	else
+	{ 
+		rear++; 
+		arr[rear] = value; 
+	} 
+} 
+
+// Function to delete element from Circular Queue 
+int Queue::deQueue() 
+{ 
+	if (front == -1) 
+	{ 
+		printf("\nQueue is Empty"); 
+		return INT_MIN; 
+	} 
+
+	int data = arr[front]; 
+	arr[front] = -1; 
+	if (front == rear) 
+	{ 
+		front = -1; 
+		rear = -1; 
+	} 
+	else if (front == size-1) 
+		front = 0; 
+	else
+		front++; 
+
+	return data; 
+} 
+
+// Function displaying the elements 
+// of Circular Queue 
+void Queue::displayQueue() 
+{ 
+	if (front == -1) 
+	{ 
+		printf("\nQueue is Empty"); 
+		return; 
+	} 
+	printf("\nElements in Circular Queue are: "); 
+	if (rear >= front) 
+	{ 
+		for (int i = front; i <= rear; i++) 
+			printf("%d ",arr[i]); 
+	} 
+	else
+	{ 
+		for (int i = front; i < size; i++) 
+			printf("%d ", arr[i]); 
+
+		for (int i = 0; i <= rear; i++) 
+			printf("%d ", arr[i]); 
+	} 
+} 
+
+/* Driver of the program */
+int main() 
+{ 
+	Queue q(5); 
+
+	// Inserting elements in Circular Queue 
+	q.enQueue(14); 
+	q.enQueue(22); 
+	q.enQueue(13); 
+	q.enQueue(-6); 
+
+	// Display elements present in Circular Queue 
+	q.displayQueue(); 
+
+	// Deleting elements from Circular Queue 
+	printf("\nDeleted value = %d", q.deQueue()); 
+	printf("\nDeleted value = %d", q.deQueue()); 
+
+	q.displayQueue(); 
+
+	q.enQueue(9); 
+	q.enQueue(20); 
+	q.enQueue(5); 
+
+	q.displayQueue(); 
+
+	q.enQueue(20); 
+	return 0; 
+}