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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">2.<font color="#FF0000"> operations for circularly linked lists</font>
<img src="image/cheadlink1.gif" width="421" height="98">
a) <font color="#FF0000">Inserting at the front of a list</font>
void <font color="#FF0000">insert_front</font>(list_pointer *ptr, list_pointer node)
<i><font size="3" color="#FF0099">/* insert node at the front of the circular list ptr, where ptr is the last
node in the list */</font></i>
{ if ( IS_EMPTY(*ptr) ) {
<i><font size="3" color="#FF0099">/* list is empty, change ptr to point to new entry */</font></i>
*ptr = node;
node->link = node;
}
else { <i><font size="3" color="#FF0099">/* list is not empty, add new entry at front */</font></i>
node->link = (*ptr)->link;
(*ptr)->link = node;
}
}
b) <font color="#FF0000">Finding the length of a circular list</font>
int length(list_pointer ptr)
{ <i><font size="3" color="#FF0099"> /* find the length of the circular list ptr */</font></i>
list_pointer temp;
int count = 0;
if ( ptr ) {
temp = ptr;
do {
count ++;
temp = temp->link;
} while ( temp != ptr );
}
return count;
}</font></b>
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