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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"> <font color="#FF0000">The circular list with head node representation</font>
<img src="image/cheadlink.gif" width="402" height="104">
<font color="#0033CC">Program</font>: <font color="#FF0000">Adding circular represented polynomials</font>
poly_pointer<font color="#FF0000"> cpadd</font>(poly_pointer a, poly_pointer b)
{
<i><font size="3" color="#FF0099">/* polynomials a and b are singly linked circular lists with a head node.
Return a polynomial which is the sum of a and b */
</font></i> poly_pointer starta, d, lastd;
int sum, done = FALSE;
starta = a; <i><font size="3" color="#FF0099">/* record start of a */</font></i>
a = a->link; <i><font size="3" color="#FF0099">/* skip head node for a and b */</font></i>
b = b->link;
d = get_node(); <i><font size="3" color="#FF0099">/* get a head node for sum */</font></i>
d->expon = -1; lasted = d;
do {
switch ( COMPARE(a->expon, b->expon) ) {
case -1: <i><font size="3" color="#FF0099">/* a->expon , b->expon */</font></i>
attach(b->coef, b->expon, &lasted);
b = b->link;
break;
case 0: <i><font size="3" color="#FF0099"> /* a->expon = b->expon */</font></i>
if ( starta == a ) done = TRUE;
else {
sum = a->coef + b->coef;
if ( sum ) attach(sum, a->expon, &lastd);
a = a->link; b = b->link;
}
break;
case 1: <i><font size="3" color="#FF0099">/* a->expon > b->expon */</font></i>
attach(a->coef, a->expon, &lastd);
a = a->link;
}
} while ( !done );
lastd->link = d;
return d;
}</font></b>
<b><font face="Arial, Helvetica, sans-serif" size="4" color="#FF0000">exercises page 150/ 3, page 181/3</font></b>
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