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<pre align="left"><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><b>
4.5 <font color="#FF0000">Additional List Operations</font>
1. <font color="#FF0000">operations for chains</font>
a) <font color="#FF0000"> Inverting a singly linked list</font></b></font></pre>
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<pre><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><b>list_pointer <font color="#FF0000">invert</font>(list_pointer lead)
{
<i><font size="3" color="#FF0099">/* invert the list pointed to by lead */</font></i>
list_pointer middle, trail;
middle = NULL;
while ( lead ) {
trail = middle; </b></font><font face="Arial, Helvetica, sans-serif"><b><i><font size="3" color="#CC0099">/* =null*/</font></i></b></font><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><b>
middle = lead;
lead = lead->link;
middle->link = trail;
}
return middle;
}</b></font></pre>
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<pre align="left"><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"><b>b)<font color="#FF0000"> Concatenating singly linked lists</font>
list_pointer <font color="#FF0000">cncatenate</font>(list_pointer ptr1, list_pointer ptr2)
{
<i><font size="3" color="#FF0099">/* produce a new list hat contains the list ptr1 followed by the list ptr2.
The list pointed to by ptr1 is changed permanently */
</font></i> list_pointer temp;
if ( IS_EMPTY(ptr1) ) return ptr2;
else {
if ( !IS_EMPTY(ptr2) ) {
for ( temp = ptr1; temp->link; temp = temp->link )
;
temp->link = ptr2;
}
return ptr1;
}
}</b></font>
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