valid identifiers

[anandkrisnan variar]

Which are valid identifiers?
1) _variables
2) �currency
3) val$ue
4) @purr
5) 2digits
Also can u tell what is the '�' in the '�currency'

[Kasi lingam]

1,2,3 are valid identifiers.
4,5 are not valid identifiers.It starts with number and invalid character.
� is the currency for Japan 'YEN'.

[Jessica Sant]

� is the currency for Japan 'YEN'.
Exactly right. Identifiers can start with a letter, underscore or a currency symbol, and they can include digits in any location EXCEPT the first one.