//array implementation of q
//qarray@standard c library(*SCL*) by ASHISH TIWARI
/*
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of the cose,though every care has been taken in making this code and has been compiled
on standard gcc compiler provided by GNU. ASHISH TIWARI shall not be liable for any
errors or omissions in the information or decisions made or actions taken in reliance
on the code.

"*SCL*" is a registered trademark of ASHISH TIWARI, IITKGP.
All contents of "*SCL*" is copyright ©2000-.... ,ASHISH TIWARI, IITKGP
unless otherwise noted. Reproduction in part or in whole without
permission is expressly prohibited.
*/

#include<stdio.h>
#include<stdlib.h>
#define max 10

struct tag{
int arr[max];
int rear,front;
};

typedef struct tag q;
q* initq(q* s);
int qempty(q* s);
int qfull(q* s);
void addq(q* s,int data);
int delq(q* s);
main()
{
int i;
q* s;
s= initq(s);
for(i=0;i<10;i++)
addq(s,i);
for(i=0;i<10;i++)
printf("%d\n",s->arr[i]);
i=delq(s);
printf("\n%d\n",i);
i=delq(s);
printf("\n%d\n",i); i=delq(s);

}

q* initq(q* s)
{
s=(q*)malloc(sizeof(q));
s->rear=-1;
s->front=-1;
return(s);
}

int qempty(q* s)
{
if(s->front==-1 && s->rear==-1)
return(1);
else
return(0);
}

int qfull(q* s)
{
if(s->rear==max-1)
return(1);
else
return(0);
}

void addq(q* s,int data)
{
if(qfull(s))
{
printf("q is full\n");
exit(1);
}
else
s->arr[++(s->rear)]=data;
if(s->front==-1)
s->front=0;
}

int delq(q* s)
{
int data;
if(qempty(s))
{
printf("q is empty\n");
exit(1);
}
else
data=s->arr[(s->front)++];


if(s->front==s->rear)
{
data=s->arr[(s->front)];
s->front=-1;
s->rear=-1;

}
return(data);
}