PureBasic Forums - English

Posted: **Fri Sep 14, 2007 1:16 am**

Any chance of adding a trinary operator to PB? Especially for setting variables. So instead of

If Known : Name = HisName : Else : Name = "???" : Endif

you simply write

Code: Select all

Name = (Known ? HisName : "???")

Though I know this may be a pain to implement into such a strongly structured language...

Posted: **Fri Sep 14, 2007 9:14 am**

I like the idea, but I think that the C-like ternary operator ('?') is not so readable. To conform with the current PB-syntax, I'd like to have something more flowing, like natural language. Maybe Test/True/False -keywords, like this:

Code: Select all

Test Known And FurryAnimal True Name = "Peter Rabbit" False Name = "???"
Test JumpFlag True ProcedureThis ( ) False ProcedureThat ( )

Or using just either True or False keyword...

Test AtomicWar Or Godzilla Or Earthquake False Danger = 0
Test CountToZero True CountToZero - 1

Just my 0.02.

Posted: **Fri Sep 14, 2007 9:24 am**

i think, the most readable construct is IIF():

Code: Select all

IIF(Expression, TruePart, FalsePart)

http://www.purebasic.fr/english/viewtopic.php?t=25788

Greetings ... Kiffi

Posted: **Fri Sep 14, 2007 9:32 am**

Kiffi wrote:i think, the most readable construct is IIF()

Yes, it's somewhat readable, but it requires both TruePart and FalsePart, which I don't like. Makes the code longer.

Posted: **Sat Sep 15, 2007 8:19 am**

Yeah, IIF() is a nice macro but doesn't work for setting variables... I see netmaestro suggested the same thing as me at the bottom of the thread Kiffi linked to...

Posted: **Sat Sep 15, 2007 5:16 pm**

thats how i do it (for strings):

Code: Select all

Macro StrIf( _StrIf_condition_, _StrIf_string_IF_, _StrIf_string_ELSE_="")
  _StrIf_proc( 0 Or (_StrIf_condition_), _StrIf_string_IF_, _StrIf_string_ELSE_ )
EndMacro


Procedure.s _StrIf_proc( condition.l, stringIF.s, stringELSE.s)
  If condition
    ProcedureReturn stringIF
  Else
    ProcedureReturn stringELSE
  EndIf
EndProcedure




; Debug "---- EXAMPLE - StrIf.pbi"
; For i=0 To 10
;   r=Random(20)-10
;   Debug StrIf(r>0,"+") + Str(r)
; Next
; Debug "----"
; For i=0 To 10
;   r=Random(3)
;   Debug StrIf(Not r,"no", Str(r))  +  StrIf(r>1," seats", " seat")
; Next
; Debug "----"

PureBasic Forums - English

Trinary Operator

Trinary Operator