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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">(3)<font color="#FF0000">Representing Polynomials As Circlarly Linked Lists</font>
<font color="#FF0033">circular list</font> ----- the link field of the last node points to
the first node in the list
<img src="image/poly8.gif" width="180" height="28"> <img src="image/clink.gif" width="404" height="45">
<font color="#FF0000"><i>avail</i> </font>----a variable of type poly_pointer that points to the
first node in the list of freed nodes.
<font color="#0033CC">Program:</font> <font color="#FF0000">get_node function</font>
poly_pointer <font color="#FF0000">get_node</font>(void)
<i><font size="3" color="#FF0099">/* provide a node for use */</font></i>
{
poly_pointer node;
if ( avail ) {
node = avail;
avail = avail->link;
}
else {
node = (poly_pointer)malloc(sizeof(poly_node));
if ( IS_FULL(node) ) {
fprintf(stderr, "The memory is full\n");
exit(1);
}
}
return node;
}</font></b>
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