[antlr-interest] Handling negative numbers

[Paul Johnson]

Sathish K wrote:
> Could anyone please guide me as to how to handle negative numbers while parsing?
>   I am currently unable to handle the number and the sign as a whole.

Are you sure you want to handle them together? Would it better to parse 
all numbers as positive numbers, and sort out the '-' in semantic analysis?

How do you analyse:

A = B - C    # subtraction
A = B -C     # no operator?
A = -C       # unary minus
A = - C      # unary minus?