Suppose you are asked to write a simple lexical analyzer for the expressions that consist of

the following tokens.

INT$\_$LIT $($Integer numbers$),$ IDENT $($identifiers$),$ ASSIGN$\_$OP$(=),$ ADD$\_$OP $(+),$ SUB$\_$OP$(-),$

MULT$\_$OP $(*),$ DIV$\_$OP$(/),$LEFT$\_$PAREN $(,$ RIGHT$\_$PAREN $)$

Integer literals and identifiers are defined via the following state diagram