More debugger checks (variable ranges)

Post by **Andre** » Sat May 03, 2003 6:01 pm

Sent to me by another german user:

DefType.l  a,b,c
a = -1073741824
b = 3
c = a * b
d$ = Str(c)
OpenConsole()
PrintN(d$)
dummy$ = Input()
CloseConsole()

; Result of PureBasic: 1073741824
; Correct result: -3221225472

The debugger should check a variable overflow and inform the user. Would avoid many false calculations...

Post by **Andre** » Sat May 03, 2003 6:06 pm

Another example, which shows when float variables break their limits:

Code: Select all

 DefType.f   a,b,c
 a = -9999999999
 b = 108765.388
 c = a * b
 d$ = StrF(c)
 OpenConsole()
 PrintN(d$)
 dummy$ = Input()
 CloseConsole()

Result of PureBasic: -153366319595520
Correct result: -1087653879891234.612

Post by **Fred** » Sat May 03, 2003 7:06 pm

Yep, I will take a look !

GPI · Post by **GPI** » Sat May 03, 2003 10:41 pm

Please optional!

It can be usefull, for example with bytes. Because now:

a.b=255

is possible, but when a overflow-check is insert, not!

Post by **Andre** » Sun May 04, 2003 1:16 pm

Please optional!

Maybe its good, to keep it optional.
Because of the reason GPI mentioned, maybe also because of speed reasons...