On January 29, 2009, Dominique SIMONART wrote: > Hi evererybody, > > If I code the few lines showed below: > > DIM X AS Byte > DIM Texte AS String[64] > > X = &h2E > X += &hE0 > TextBox1.Text = Hex(X) > Texte[X] = Hex(X) > > I get '10E' displayed. Is this correct for a byte? I think the 10E indicates an overflow (the 1 part) and thus an error, as it won't fit in the 00 to FF range. The 0E would be the remainder. A question would be if you wanted signed or unsigned math. With E0 as signed (11100000) this is also -1F (00011111) (ones complement). Adding the 2 numbers would be 2E - 1F = 0F or something similar.
I think there is actually a twos complement process that should be followed instead of the ones complement, but I think you get the picture. Basically, byte is the wrong datatype for this. > If you put a breakpoint on the TextBox1 line, the local variables show X > value as 14 (&h0E) which is correct. > and the last line ends wit an 'out of bounds' message. > > (as a workaround, I actually insert a' X = X MOD 256' instruction just > before the last line) > > If you wonder why the hell I've to use bytes, I'm working on a memory > capture of an Amiga program ("Captive") running inside the emulator > WinUAE. In those old days (twenty years ago), memory was 0.0005 Gb and > byte usage was quite common! > and more, the memory byte order was not compatible with the actual PC so > you have to read memory byte by byte to restore the Amiga organisation > > regards, > Dominique Simonart > > > ------------------------------------------------------------------------- >----- This SF.net email is sponsored by: > SourcForge Community > SourceForge wants to tell your story. > http://p.sf.net/sfu/sf-spreadtheword > _______________________________________________ > Gambas-user mailing list > Gambas-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gambas-user -- Paul Horechuk Think Free Use Open Source Software ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user