Equivalent of PB IsFalse operator

[Chris Chancellor]

Hello Charles

do you have a macro that can do a similar function as the PB's  IsFalse operator ?

please refer to https://forum.powerbasic.com/forum/announcements-articles-and-support-faqs/pbwin-online-help-and-commentary/57595-isfalse-and-istrue-operators

i tried to replace it with NOT  and was not sucessful?

[Brian Alvarez]

Did you try encapsulating the value?

Code Select Expand

IF NOT (Statement + Statement) THEN

END IF

[Charles Pegge]

You can directly substitute IsFalse with not

if not a=b then ...

[Patrice Terrier]

The use of PB's IsFalse / IsTrue is a waste of time.

Zero is Always FALSE, while any other value is TRUE.
The NOT operator convert ZERO to -1, while NOT -1 = ZERO.

[Charles Pegge]

In o2, the conditional not is a boolean rather than a bitwise operator. It inverts the logic of any expression that follows it. The grammar is imperfect but it supports very concise conditionals:

Code Select Expand


int a
if a
  ...
endif

if not a
  ...
endif


translates to:

Code Select Expand


'if
cmp a,0
jz  fwd _end_cnd
...
._end_cnd

'if not
cmp a,0
jnz  fwd _end_cnd
...
._end_cnd


[Chris Chancellor]

Thanxx a lot Charles

It makes more sense to use O2 than the ancient PB