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Circular Queue

B
Balaji K
16/11/2020 0 0

#include <stdio.h>

#include <stdlib.h>

#define MAX 5

char a[MAX];

int front = 0, rear = -1, count = 0;

 

void insert()

{

  char item;

if(count==MAX)

{

   printf("\n\t\tCircular Queue Overflow");

   return;

   }

   else

   {

   printf("\n\t Enter the Element: ");

   scanf("%s",&item);

   rear=(rear+1)%MAX;

   a[rear] = item;

   count = count + 1;

   }

   }

 

   void del()

   {

   char item;

   if(count == 0)

   {

      printf("\n\t\tCircular Queue Underflow");

      return;

    }

   else

   {

   item = a[front];

   front = (front+1)%MAX;

   count = count - 1;

   printf("\n\tDeleted Item = %c",item);

   }

   }

 

 

   void display()

   {

   int i,j=front;

   if(count == 0)

     {

     printf("\n\t\tCircular Queue is Empty");

     return;

     }

   else

   {

   printf("\n\tFront = %d  Rear = %d  Count = %d\n",front,rear,count);

   printf("\n\tCircular Queue Elements are: \n\n");

    for(i=1;i<=count;i++)

   {

     printf("\t%d",j);

     j = (j+1)%MAX;

     }

   printf("\n");

   j = front;

   for(i=1;i<=count;i++)

   {

     printf("\t%c",a[j]);

     j = (j+1)%MAX;

     }

     }

     }

 

     int main()

     {

     int ch;

     do

     {

     printf("\n\n\t\tCircular Queue\n\n");

     printf("\t<1> Insert\n");

     printf("\t<2> Delete\n");

     printf("\t<3> Display\n");

     printf("\t<4> Exit\n\n");

     printf("\t    Enter Your Choice: ");

     scanf("%d",&ch);

     switch(ch)

     {

     case 1: insert();

             display();

             break;

 

     case 2: del();

             display();

             break;

     case 3: display();

             break;

     case 4: exit(0);

 

     default: printf("\n\tInvalid Choice")                          ;

              break;

     }

     } while(ch!=5);

     return 0;

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