Implementation of linked list using array.

Program:
 #include<stdio.h>
#include<conio.h>
#define TRUE 1
#define SIZE 10
struct link
{
int info;
int next;
};
struct link node[SIZE];
int Getnode();
void Createlist();
void Freenode(int);
void Display();
void Insert(int,int);
void Delete(int);
int p, avail=0;
void main()
{
int ch=1,i,n,x;
clrscr();
/*Creation of available list*/
for(i=0;i<SIZE-1;i++)
node[i].next=i+1;
node[SIZE-1].next=-1;
printf("\n Create a List:");
Createlist();
while(ch!=4)
{
printf("\n1-DISPLAY");
printf("\n2-INSERT");
printf("\n3-DELETE");
printf("\n4-QUIT");
printf("\n Enter your choice:");
scanf("%d",&ch);
switch(ch)
{
case 1 :
Display();
break;
case 2:
printf("\n Node insertion:after which node:");
scanf("%d",&n);
p=n;
printf("\n Enter the item for insertion:");
scanf("%d",&x);
Insert(p,x);
break;
case 3:
printf("\n Enter the node after which the node will be deleted:");
scanf("%d",&n);
p=n;
Delete(p);
break;
case 4:
break;
default:
printf("\n Wrong choice!Try again:");
}
}
}
int Getnode()
{
if (avail==-1)
{
printf("\n Overflow:");
exit(0);
}
p=avail;
avail=node[avail].next;
return p;
}
void Freenode(int q)
{
node[q].next=avail;
avail=q;
return;
}
void Createlist()
{
int x;
char c;
p=Getnode();
printf("\n Enter an item to be inserted:");
scanf("%d", &x);
node[p].info=x ;
node[p].next=-1;
while(TRUE)
{
printf("\n Enter the choice(y/n):");
fflush(stdin);
c=getchar();
if(c=='y'||c=='Y')
{
printf("\n Enter an item to be inserted:");
scanf("%d",&x);
Insert(p,x);
node[p].next= -1;
}
else
return;
}
}
void Display()
{
p=0;
while(node[p].next!=-1)
{
printf("\n%d\t%d\t%d:",p,node[p].info,node[p].next);
p=node[p].next;
}
printf("\n%d\t%d\t%d:",p,node[p].info,node[p].next);
}
void Insert(int r,int x)
{
int q;
if(r==-1)
{
printf("\n void insertion:");
return;
}
q=Getnode();
node[q].info=x;
node[q].next=node[r].next;
node[r].next=q;
return;
}
void Delete(int r)
{
int q;
if(r==-1||node[r].next==-1)
{
printf("\n void deletion:");
return;
}
q=node[r].next;
node[r].next=node[q].next;
Freenode(q);
return;
}