Answer Posted / vinit

#include<stdio.H>
#include<conio.h>
#define MAXQ 10
struct cq
{
int data[MAX];
int front,rear;
};
void add(struct cq*,int);
int del(struct cq*);
void main()
{
int ch,item;
struct cq q1;
q1.front=q1.rear=-1;
printf("\t\tMAIN MENU\n");
printf("\t\t************\n");
printf("\t\t 1.Add in a circular queue\n");
printf("\t\t 2.delete from circular queue\n");
printf("\t\t 3.Exit\n");
printf("\t\t Enter your choice\n");
scanf("%d",&ch);
clrscr();
switch(ch)
{
case 1:
printf("Enter the value which is to be add:-");
scanf("%d",&item);
add(&q1,item);
break;
case 2:
item=del(&q1);
if(item!=NULL)
printf("Delete value ->%d",item);
break;
case 3:
break;
default:
printf("Wromg choice !Try again") ;
}
getch();
}
while(ch!=3);
}

void add(struct cq*p,int item)
{
if(p->rear==MAX-1 && p->front==0 || p->rear+1==p->front)
{
printf("Queue is full\n");
return;
}
if(p-.front==-1)
p->front=p->raer=0;
else if(p->rear=MAX-1)
p->rear=0;
else
p->rear++;
p->data[p->rear]=item;
}

int del(struct cq*p)
{
int item;
if(p->front==-1)
{
printf("Queue is Empty");
return(NULL);
}
item=p->data[p->front];
if(p->front==p->rear)
p->front=p->rear=-1;
else if(p->front==MAX-1)
p->front=0;
else
p->front++;
return(item);
}

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