Answer Posted / vivek

# 3 using 2 pointer:
void reverse(node* head_in_out)
{
if(head_in_out)
{
node* aCurr = head_in_out;
node* aNext = NULL;
while (aCurr)
{
head_in_out = aCurr->next;
aCurr->next = aNext;
aNext = aCurr;
aCurr = head_in_out;
}
head_in_out = aNext; // Bug in above 3rd answer.
}

}

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