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/* http://native-code.blogspot.com */

#include<stdio.h>
#include<conio.h>
#define MAX 20
int f,r,q[MAX];
int isempty();
int isfull();
int del();
void insert(int);
void display();
void main()
{
int k,ch,d;
k=ch=d=0;
f=-1;r=-1;
while(1)
{
printf("/* http://native-code.blogspot.com */");
printf("\n\n1: Insert\n2: Delete\n3: Display\n4: EXIT\n");
scanf("%d", &ch);
switch(ch)
{
case 1:
if(isfull()==0)
{
printf("Enter element:\n");
scanf("%d", &k);
insert(k);
}
else
printf("Overflow\n");
break;
case 2:
if(isempty()==0)
{
d=del();
printf("Deleted number is: %d\n",d);
}
else
printf("Underflow\n");
break;
case 3:
display();
printf("\n");
break;
case 4:
exit(0);
default:
printf("Wrong choice.\n");
}
}
}
void insert(int k)
{
if(isempty())
r=f=0;
else
r++;
q[r]=k;
}
int del()
{
int temp;
temp=q[f++];
if(f>r)
f=r=-1;
return(temp);
}
int isfull()
{
if(r==(MAX-1))
return(1);
else
return(0);
}
int isempty()
{
if(f==-1 && r==-1)
return(1);
else
return(0);
}
void display()
{
int i;
for(i=f; i<=r; i++)
printf("%d ", q[i]);
}

/* http://native-code.blogspot.com */

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