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Added --define to lwasm documentation. Added documentation of the -D/--define command line option for lwasm. It has been present for a long time but has somehow escaped documentation.
author William Astle <lost@l-w.ca>
date Sun, 15 Jul 2012 23:12:09 -0600
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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5 >Numbers and Expressions</TITLE
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56 >Chapter 3. LWASM</TD
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77 >3.5. Numbers and Expressions</A
78 ></H1
79 ><P
80 >&#13;Numbers can be expressed in binary, octal, decimal, or hexadecimal. Binary
81 numbers may be prefixed with a "%" symbol or suffixed with a "b" or "B".
82 Octal numbers may be prefixed with "@" or suffixed with "Q", "q", "O", or
83 "o". Hexadecimal numbers may be prefixed with "$", "0x" or "0X", or suffixed
84 with "H". No prefix or suffix is required for decimal numbers but they can
85 be prefixed with "&amp;" if desired. Any constant which begins with a letter
86 must be expressed with the correct prefix base identifier or be prefixed
87 with a 0. Thus hexadecimal FF would have to be written either 0FFH or $FF.
88 Numbers are not case sensitive.&#13;</P
89 ><P
90 > A symbol may appear at any point where a number is acceptable. The
91 special symbol "*" can be used to represent the starting address of the
92 current source line within expressions. </P
93 ><P
94 >The ASCII value of a character can be included by prefixing it with a
95 single quote ('). The ASCII values of two characters can be included by
96 prefixing the characters with a quote (").</P
97 ><P
98 >&#13;LWASM supports the following basic binary operators: +, -, *, /, and %.
99 These represent addition, subtraction, multiplication, division, and
100 modulus. It also supports unary negation and unary 1's complement (- and ^
101 respectively). It is also possible to use ~ for the unary 1's complement
102 operator. For completeness, a unary positive (+) is supported though it is
103 a no-op. LWASM also supports using |, &#38;, and ^ for bitwise or, bitwise and,
104 and bitwise exclusive or respectively.&#13;</P
105 ><P
106 >&#13;Operator precedence follows the usual rules. Multiplication, division, and
107 modulus take precedence over addition and subtraction. Unary operators take
108 precedence over binary operators. Bitwise operators are lower precdence
109 than addition and subtraction. To force a specific order of evaluation,
110 parentheses can be used in the usual manner.&#13;</P
111 ><P
112 >&#13;As of LWASM 2.5, the operators &#38;&#38; and || are recognized for boolean and and
113 boolean or respectively. They will return either 0 or 1 (false or true).
114 They have the lowest precedence of all the binary operators.&#13;</P
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