Answer Posted / pradip mishra(b-tech it)

Create two pointers, each set to the start of the list.
Update each as follows:

while (pointer1) {
pointer1 = pointer1->next;
pointer2 = pointer2->next; if (pointer2)
pointer2=pointer2->next;
if (pointer1 == pointer2) {
print (\"circular\n\");
}
}

If a list is circular, at some point pointer2 will wrap
around and be either at the item just before pointer1, or
the item before that. Either way, it?s either 1 or 2 jumps
until they meet.

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