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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>Hi<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>In his Oberon report, Wirth leaves the character coding very undefined. He leaves it up to the implementation a) how many bytes a CHAR has and b) what coding is used.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>However in a lot of places you clearly see source code that only works if ASCII (or Latin-1) encoding is assumed.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>Eg in Texts.Scan you find:<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";color:windowtext'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";color:windowtext'> IF ch <= "9" THEN d := ORD(ch) - 30H ELSE d := ORD(ch) - 37H; hex := TRUE END;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>This code will not work if the implementation would decide for EBCDIC.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>This source code is a little better (would work for ASCII and EBCDIC)<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";color:windowtext'> IF ch <= "9" THEN d := ORD(ch) – ORD("0") ELSE d := ORD(ch) – (ORD("A") – 10); hex := TRUE END;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>br<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:"Arial",sans-serif;color:windowtext'>Jörg<o:p></o:p></span></font></p><p class=MsoNormal><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><font size=2 color=black face=Calibri><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext;font-weight:bold'>From:</span></font></b><font size=2 color=black face=Calibri><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext'> Oberon [mailto:oberon-bounces@lists.inf.ethz.ch] <b><span style='font-weight:bold'>On Behalf Of </span></b>Douglas G. Danforth<br><b><span style='font-weight:bold'>Sent:</span></b> Montag, 11. Juli 2016 01:13<br><b><span style='font-weight:bold'>To:</span></b> ETH Oberon and related systems <oberon@lists.inf.ethz.ch><br><b><span style='font-weight:bold'>Subject:</span></b> Re: [Oberon] CHAR to/from BYTE conversion<o:p></o:p></span></font></p></div></div><p class=MsoNormal><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>On 7/8/2016 11:58 PM, Jörg Straube wrote:<br><br><o:p></o:p></span></font></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><font size=2 color=black face=ArialMT><span style='font-size:10.0pt;font-family:"ArialMT",serif'> string = """ {character} """ | digit {hexdigit} "X" . </span></font><o:p></o:p></p></blockquote><p class=MsoNormal><font size=3 color=black face="Times New Roman"><span style='font-size:12.0pt'>How about dropping the hex representation and leaving character abstract?<br></span></font><font size=2 face=ArialMT><span style='font-size:10.0pt;font-family:"ArialMT",serif'> string = """ {character} """<br></span></font><br>But then one needs, tab, end-of-line, form-feed, etc, to also be abstract.<o:p></o:p></p></div></body></html>