Thanks for all the replies; I especially like the double unary as a neat
method of, in effect, multiplying by 1. (Incidentally I did a search on that
and was interested to see that you can also use this -- prefix for the lookup
value in a VLOOKUP in case your lookup value is text and the first column of
the lookup table is numbers - useful if unrelated!).

As Bob says, TRUE/FALSE are not numbers so I guess we should just be
grateful they return 1 and 0 in simple calculations (and aren't -1 and 0 as
they are in VBA).

Looking at it the other way around, it would be nice if Excel could format
1s and 0s to TRUEs and FALSEs for use in truth tables, e.g.

A B A x B
TRUE TRUE TRUE
TRUE FALSE FALSE
FALSE TRUE FALSE
FALSE FALSE FALSE

You can fiddle it with the number format "TRUE";;"FALSE" but this goes wrong
(strangely) for a typed 0.

"Ron Rosenfeld" wrote:

On Mon, 19 Feb 2007 04:18:16 -0800, Smallweed
wrote:

It's nice to use TRUEs and FALSEs in simple calculations (such as add and
multiply) where TRUE cells are treated by Excel as having a value of 1 and
FALSE cells 0 - although it is strange that =SUM treats them all as 0.

Does anyone know a way of formatting logical cells to actually display 1 for
TRUE and 0 for FALSE?

Obviously one could put together a macro or UDF that physically converted
these values but I would ideally like some kind of Excel format.

The number formats only apply to cells that contain numbers.

If you want to display 1 or 0, you would have to convert the logical results to
numbers, perhaps by preceding your formula with a double unary.

e.g. =--(your_formula_that_returns_TRUE/FALSE)


--ron