Evaluate such an expression as: (A and B) xor (C or D)

[evan]

Can you give me a hint as how to go about evaluating such an expression. The
actual expression will be different every time (user input). The data will
be sorted in an array or a list.

Thanks,

Evan

[John Harrison]

"evan" <ep******@frontiernet.net> wrote in message
news:zy***************@news02.roc.ny...

Can you give me a hint as how to go about evaluating such an expression. The actual expression will be different every time (user input). The data will
be sorted in an array or a list.

Thanks,

Evan

You have to write a parser. Best way would be to find an example in a book.
Writing parsers is a big topic in computer science and many books cover this
in more or less depth.

Stroustrup has an example in 'The C++ Programming Language' 3rd edition. His
is an evaluator for arithmetic expressions whereas you seem to have a
logical expression but the principles are just the same.

john