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struct Node
{
int num;
Node * next;
};
Node * reverse(Node * head)
{
if(head==NULL)
{
return NULL;
}
Node * p1,p2;
p2=head;
p1=head->next;
p2->next=NULL;
while(p1)
{
p1->next=p2;
p2=p1;
p1=p1->next;
}
return p2;
}
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It is not about optimization.
The whole idea of using 'do/while' version
is to make a macro which will
expand into a regular statement, not into a
compound statement. This is
done in order to make the use of function-s ......
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