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author lost
date Fri, 24 Apr 2009 22:36:09 +0000
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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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76 NAME="AEN139"
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 >LWASM supports the following basic binary operators: +, -, *, /, and %.
99 These represent addition, subtraction, multiplication, division, and modulus.
100 It also supports unary negation and unary 1's complement (- and ^ respectively).
101 For completeness, a unary positive (+) is supported though it is a no-op.</P
102 ><P
103 >Operator precedence follows the usual rules. multiplication, division,
104 and modulus take precedence over addition and subtraction. Unary operators
105 take precedence over binary operators. To force a specific order of evaluation,
106 parentheses can be used in the usual manner.</P
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