Why these codes get different results?

[goomoo]

Hello,everyone.

Why these two Debug statements get different results?
Thanks.

Code: Select all

a.b=255
Debug Hex(a)
Debug Hex(255)

[Hatonastick]

Try:
Debug Hex(a & $FF)
I haven't tested it but I'm pretty sure I know what the problem is as I keep forgetting that bytes are signed in PB.
So instead of being ranged from 0 - 255 (unsigned byte), they range from -127 to 127.

[Trond]

Yes the problem is the unsigned bytes. I think PB should do variable bounds checking with debugger. At least at compile time. And I would like unsigned bytes.

Watch this code to see it demostrated

Code: Select all

a.b=255
Debug Hex(Val(StrU(a,#Byte))) ;print the unsigned value
Debug Hex(Val(Str(a))) ;print the signed value
Debug Hex(a) ;print the signed value
Debug Hex(255)

[Joakim Christiansen]

Byte .b 1 byte in memory -128 to +127
Edit: Damn somebody already said this, i'm tired...