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diff doc/manual/x137.html @ 153:ffef3ea07399 2.1 2.1
Preparing for release
author | lost |
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date | Fri, 30 Jan 2009 04:32:55 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/doc/manual/x137.html Fri Jan 30 04:32:55 2009 +0000 @@ -0,0 +1,172 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> +<HTML +><HEAD +><TITLE +>Numbers and Expressions</TITLE +><META +NAME="GENERATOR" +CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK +REL="HOME" +TITLE="LW Tool Chain" +HREF="index.html"><LINK +REL="UP" +TITLE="LWASM" +HREF="c35.html"><LINK +REL="PREVIOUS" +TITLE="Symbols" +HREF="x133.html"><LINK +REL="NEXT" +TITLE="Assembler Directives" +HREF="x144.html"></HEAD +><BODY +CLASS="SECTION" +BGCOLOR="#FFFFFF" +TEXT="#000000" +LINK="#0000FF" +VLINK="#840084" +ALINK="#0000FF" +><DIV +CLASS="NAVHEADER" +><TABLE +SUMMARY="Header navigation table" +WIDTH="100%" +BORDER="0" +CELLPADDING="0" +CELLSPACING="0" +><TR +><TH +COLSPAN="3" +ALIGN="center" +>LW Tool Chain</TH +></TR +><TR +><TD +WIDTH="10%" +ALIGN="left" +VALIGN="bottom" +><A +HREF="x133.html" +ACCESSKEY="P" +>Prev</A +></TD +><TD +WIDTH="80%" +ALIGN="center" +VALIGN="bottom" +>Chapter 3. LWASM</TD +><TD +WIDTH="10%" +ALIGN="right" +VALIGN="bottom" +><A +HREF="x144.html" +ACCESSKEY="N" +>Next</A +></TD +></TR +></TABLE +><HR +ALIGN="LEFT" +WIDTH="100%"></DIV +><DIV +CLASS="SECTION" +><H1 +CLASS="SECTION" +><A +NAME="AEN137" +>3.5. Numbers and Expressions</A +></H1 +><P +>Numbers can be expressed in binary, octal, decimal, or hexadecimal. +Binary numbers may be prefixed with a "%" symbol or suffixed with a +"b" or "B". Octal numbers may be prefixed with "@" or suffixed with +"Q", "q", "O", or "o". Hexadecimal numbers may be prefixed with "$" or +suffixed with "H". No prefix or suffix is required for decimal numbers but +they can be prefixed with "&" if desired. Any constant which begins with +a letter must be expressed with the correct prefix base identifier or be +prefixed with a 0. Thus hexadecimal FF would have to be written either 0FFH +or $FF. Numbers are not case sensitive.</P +><P +> A symbol may appear at any point where a number is acceptable. The +special symbol "*" can be used to represent the starting address of the +current source line within expressions. </P +><P +>The ASCII value of a character can be included by prefixing it with a +single quote ('). The ASCII values of two characters can be included by +prefixing the characters with a quote (").</P +><P +>LWASM supports the following basic binary operators: +, -, *, /, and %. +These represent addition, subtraction, multiplication, division, and modulus. +It also supports unary negation and unary 1's complement (- and ^ respectively). +For completeness, a unary positive (+) is supported though it is a no-op.</P +><P +>Operator precedence follows the usual rules. multiplication, division, +and modulus take precedence over addition and subtraction. Unary operators +take precedence over binary operators. To force a specific order of evaluation, +parentheses can be used in the usual manner.</P +></DIV +><DIV +CLASS="NAVFOOTER" +><HR +ALIGN="LEFT" +WIDTH="100%"><TABLE +SUMMARY="Footer navigation table" +WIDTH="100%" +BORDER="0" +CELLPADDING="0" +CELLSPACING="0" +><TR +><TD +WIDTH="33%" +ALIGN="left" +VALIGN="top" +><A +HREF="x133.html" +ACCESSKEY="P" +>Prev</A +></TD +><TD +WIDTH="34%" +ALIGN="center" +VALIGN="top" +><A +HREF="index.html" +ACCESSKEY="H" +>Home</A +></TD +><TD +WIDTH="33%" +ALIGN="right" +VALIGN="top" +><A +HREF="x144.html" +ACCESSKEY="N" +>Next</A +></TD +></TR +><TR +><TD +WIDTH="33%" +ALIGN="left" +VALIGN="top" +>Symbols</TD +><TD +WIDTH="34%" +ALIGN="center" +VALIGN="top" +><A +HREF="c35.html" +ACCESSKEY="U" +>Up</A +></TD +><TD +WIDTH="33%" +ALIGN="right" +VALIGN="top" +>Assembler Directives</TD +></TR +></TABLE +></DIV +></BODY +></HTML +> \ No newline at end of file