Circular Queue C program Added:::::

C/Circular_queue.c

@@ -0,0 +1,161 @@
+#include<stdio.h>
+#define max 5
+
+int front=-1, rear=-1;
+
+int q[max];
+
+void push();
+void pop();
+void display();
+
+int main()
+{
+	int ch;
+
+	while(1)
+	{
+		printf("\n1.Insert\n2.Delete\n3.Display\n4.Exit");
+		printf("\nEnter your choice:-");
+		 scanf("%d",&ch);
+
+	      switch(ch)
+	      {
+	      	case 1:
+	      		{
+
+	      			push();
+	      			break;
+	      		}
+	      	case 2:
+			  {
+			  	pop();
+			  	break;
+			  }
+
+	     case 3:
+		 {
+		 	display();
+		 	break;
+
+		 }
+		 case 4:
+		 {
+		 	exit(0);
+		 }
+		 default:
+		 	{
+		 		printf("Invalid chioce");
+		 	}
+
+
+	}
+}
+}
+
+
+void push()
+{
+    int item;
+    printf("\nEnter the no:-");
+    scanf("%d",&item);
+	if((front== 0 && rear==max-1)||(front==rear+1))
+	{
+		printf("QUEUE is full");
+		return;
+	}
+	else
+    {
+
+
+	 if(front==-1)
+	{
+		front=0;
+
+	}
+	if(rear==max-1)
+	{
+		rear=0;
+		q[rear]=item;
+	}
+	else
+	{
+		rear=rear+1;
+		q[rear]=item;
+	}
+    }
+}
+
+
+
+void pop()
+{
+	if(front==-1)
+	{
+		printf("QUEUE is empty");
+
+	}
+	else
+    {
+
+
+	if(front==rear)
+	{
+			printf("\nthe deleted item is:-%d",q[front]);
+			front=rear=-1;
+
+	}
+	 if(front==max-1)
+	{
+		printf("\nthe deleted item is:- %d",q[front]);
+		front=0;
+
+	}
+	else
+	{
+		printf("\nthe deleted item is:- %d",q[front]);
+		front++;
+	}
+    }
+}
+
+void display()
+{
+    int i;
+    if(front==-1)
+        printf("\n Queue is empty");
+    else
+    {
+
+
+
+     if(rear>=front)
+    {
+    		for(i=front;i<=rear;i++)
+		{
+			printf("%d",q[i]);
+		}
+
+
+    }
+    else
+    {
+
+
+
+	   for(i=0;i<=rear;i++)
+	   {
+	   	printf("%d",q[i]);
+	   }
+	   for(i=front;i<=max-1;i++)
+		{
+			printf("%d",q[i]);
+		}
+
+
+    }
+
+    }
+
+}
+