[Flex-help] Floating-point constant suffixes

[Rodrigo D. <ro...@ho...>]

Hello,

I am writing the lexical rules for a C-like language and I am having some issues with floating-point constant suffixes:

The input to the lexer is "8.0f". I have two rules in the following order in my file:

D           [0-9]
L           [a-zA-Z_]
H           [a-fA-F0-9]
E           [Ee][+-]?{D}+
O           [0-7]

%%

{L}({L}|{D})*              { return(IDENTIFIER); }
{D}+"."{D}*({E})?[fF]? { return(FLOATCONSTANT); }

For some reason I would like to understand, the input is being tokenized as "8.0" (FLOATCONSTANT) and "f" (IDENTIFIER) instead of "8.0f" (FLOATCONSTANT). I have reviewed the precedence rules and it still doesn't make sense to me.

Any help would be appreciated.

Rod