GPL- Discussion on question

Given a singly linked list find the n-th node from the back.
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A let "list ' points to the 1st node

void Show_nthElementFromLast(node *list ,int n)
{
node *pt;
int i,c=0;
if(list==NULL)
printf("empty");
else
{
for(pt=list;pt!=NULL;pt=pt->next)
c++;
for(pt=list,i=0;i<c-n;i++,pt=pt->next);
printf("%d",pt->info);
}
}