What is "--" used for in forumlae

[The Cherub]

I have seen the "--" symbols used in formulae quite a lot on here, but have
no idea what they do. Can anyone shed any light on this?

 

[Mike H]

Hi,

It's used to coerce True/False 1 & 0

An excellent explanation here

http://www.mcgimpsey.com/excel/formulae/doubleneg.html


Mike

 

[The Cherub]

Thanks Mike. Trying to google for "--" really wasn't working (not
surprisingly!)