p3.c

#include<stdio.h>
#define size 5
char queue[size];
int front=-1,rear=-1;
void insert()
{
    char ch;
    if((rear+1)%size==front)
    {
        printf("full\n");
    }
    else{
        printf("enter the character\n");
        scanf("%s",&ch);
        if(front==-1&&rear==-1)
        {
            front=rear=0;
        }
        else
        {
            rear=(rear+1)%size;
        }
        queue[rear]=ch;
        printf("%c inserted successfully\n",ch);
    }
}
void delete()
{
    char ch;
    if(front==-1&&rear==-1)
    {
        printf("empty\n");
    }
    else{
        char ch=queue[front];
        if(front==rear)
        {
            front=rear=1;
        }
        else
        {
            front=(front+1)%size;
        }
        printf("%c deleted susscefully\n",ch);
    }
}
void display()
{
    if(front==-1&&rear==-1)
    {
        printf("empty\n");
    }
    else
    {
        printf("circular queue element\n");
        int i=front;
        while(1)
        {
            printf("%c",queue[i]);
            if(i==rear)
            break;
            i=(i+1)%size;
        }
        printf("%d=front,%d=rear\n",front,rear);
    }
}
int main()
{
    int choice;
    while(1)
    {
        printf("1.Insert");
        printf("2.delete");
        printf("3.display");
        printf("4.exit");
        printf("enter the choice\n");
        scanf("%d",&choice);
        switch(choice)
        {
            case 1:insert();
            break;
            case 2:delete();
            break;
            case 3:display();
            break;
            case 4:printf("exisiting program");
            return 0;
            default:printf("invalid choice");
        }
    }

}