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 Post subject: The "100 < 1.1*1" problem
PostPosted: Wed Feb 20, 2019 6:31 pm 
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Posts: 14
Code:
Global.L x
x = 100
If x < 1.0*1
    Debug "100 < 1.0*1"
Endif
If x < 1.1*1
    Debug "100 < 1.1*1"
Endif

Please give out your results!


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 Post subject: Re: The "100 < 1.1*1" problem
PostPosted: Wed Feb 20, 2019 7:11 pm 
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Joined: Wed Dec 23, 2009 10:14 pm
Posts: 3121
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Not gonna lie, this is a pain in the A$$! :evil:
However, it is rare, that the inequality is formed without variables... :wink:
Code:
Global.L x = 100
Global.d y = 1.0
Global.d z = 1.1
If x < (y)
  Debug "BAD!  100 < y"
EndIf
If x < (z)
  Debug "BAD!  100 < z"
EndIf
If x < (1.0)
  Debug "BAD!  100 < 1.0"
EndIf
If x < (1.1)
  Debug "BAD!  100 < 1.1"
EndIf
If x < (1.0 * 1)
  Debug "BAD!  100 < 1.0 * 1"
EndIf
If x < (1.1 * 1)
  Debug "BAD!  100 < 1.1 * 1"
EndIf

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 Post subject: Re: The "100 < 1.1*1" problem
PostPosted: Wed Feb 20, 2019 10:01 pm 
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I get "100 < 1.1*1" outputted with the code as it stands.

But I get no outputs at all if I use "Global.f x" which is how it's meant to be. If you're going to use float calculations ("1.1*1") then the variable holding the result must also be of float type (not long type). Make "x" a float and you'll see that it works.


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 Post subject: Re: The "100 < 1.1*1" problem
PostPosted: Wed Feb 20, 2019 10:28 pm 
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Looks for me like a bug. Purebasic has to handle type conversions properly without explicit casting. If you write the following it works properly.
Code:
Global.L x = 100
If x < Int(1.1 * 1)
  Debug "BAD!  100 < 1.1 * 1"
EndIf

There other way around it also works
Code:
Global.L x = 100
If Abs(x) < 1.1 * 1
  Debug "BAD!  100 < 1.1 * 1"
EndIf

All together:
Code:
Global.i x = 100

If x < 1.1 * 1
  Debug "BAD!  100 < 1.1 * 1"
EndIf

If x < Int(1.1 * 1)
   Debug "BAD!  100 < Int(1.1 * 1)"
EndIf

If Abs(x) < 1.1 * 1
   Debug "BAD!  Abs(100) < 1.1 * 1"
EndIf

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 Post subject: Re: The "100 < 1.1*1" problem
PostPosted: Tue May 14, 2019 12:58 pm 
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@AtomUpgrader

Reported it here -> viewtopic.php?f=4&t=72339&p=533241#p533241

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 Post subject: Re: The "100 < 1.1*1" problem
PostPosted: Tue May 14, 2019 4:09 pm 
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Would be fine if Fred could provide some simple casting functions...

Code:
Macro Integer(value)
   Int((value))
EndMacro
Macro Float(value)
   1.0*(value)   
EndMacro

Global.i x
x = 100
If x < 1.0*1
   Debug "100 < 1.0*1"
EndIf
If x < 1.1*1
   Debug "100 < 1.1*1"
EndIf
If x < Integer(1.1*1)
   Debug "100 < 1.1*1"
EndIf
If Float(x) < 1.1*1
   Debug "100 < 1.1*1"
EndIf


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