What is the sigtnificance of explanation mark

Peter Williams 2011.04.16 09:30

I have been 'playing' with some code examples and I cam across

if (!ExistPositions()) {

What is the significance of the ! or exclamation mark?

M_j 2011.04.16 09:39 #1

https://docs.mql4.com/basis/operations/bool

Operand of logical negation (operation NOT displayed as exclamation mark)

Peter Williams 2011.04.18 08:40 #2

M_j:

https://docs.mql4.com/basis/operations/bool

Operand of logical negation (operation NOT displayed as exclamation mark)

Thanks very much. Obvious when you know how!