Michael Fabain Dirks
139 lines
4.4 KiB
HTML
139 lines
4.4 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type"
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content="text/html; charset=iso-8859-1">
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<title>Language Reference - Expressions and Conversions</title>
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<link rel="stylesheet" href="lang_ref.css" type="text/css">
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</head>
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<body><br>
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<span class="Command"> Expressions and Conversions </span>
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<blockquote>
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<p> The following operators are supported, listed in order of precedence: </p>
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</blockquote>
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<table width="85%" border="0" cellspacing="2" cellpadding="2" align="center">
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<tr>
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<td width="13%" nowrap>
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<p>
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<p>New,First,Last</p>
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</td>
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<td width="87%">custom type operators (unary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>
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<p>
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<p>Before,After</p>
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</td>
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<td width="87%">object operators (unary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>
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<p>
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<p>Int,Float,Str</p>
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</td>
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<td width="87%">type conversion operators (unary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>
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<p>
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<p>+,-,~</p>
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</td>
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<td width="87%">arithmetic posate(?), negate, bitwise complement (unary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>^</td>
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<td width="87%">arithmetic 'to-the-power-of' (binary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>*,/,Mod</td>
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<td width="87%">arithmetic multiply, divide, remainder (binary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>
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<p>
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<p>Shl,Shr,Sar</p>
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</td>
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<td width="87%">bitwise shift operators (binary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>
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<p>
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<p>+,-</p>
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</td>
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<td width="87%">arithmetic add, subtract (binary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>
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<p>
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<p><,>,<=,>=,=,<></p>
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</td>
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<td width="87%">comparison operators (binary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>
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<p>
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<p>And,Or,Xor</p>
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</td>
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<td width="87%">bitwise And, Or and Exclusive Or (binary) </td>
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</tr>
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<tr>
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<td width="13%" nowrap>Not</td>
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<td width="87%">
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<p>
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<p> logical Not (unary)</p>
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</td>
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</tr>
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</table>
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<p>
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<p>
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<blockquote>
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<p> Unary operators take one operand, while binary operators take two. </p>
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<p> Arithmetic operators produce a result of the same type as the operands.
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For example, adding two integers produces an integer result. </p>
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<p> If the operands of a binary arithmetic or comparison operator are not of
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the same type, one of the operands is converted using the following rules:
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</p>
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<blockquote>
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<p>- If one operand is a custom type object, the other must be an object of
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the same type, or 'Null'.<br>
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</p>
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<blockquote>
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<p>Else if one operand is a string, the other is converted to a string.
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<br>
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</p>
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<p>Else if one operand is floating point, the other is converted to floating
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point. <br>
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</p>
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<p>Else both operands must be integers. </p>
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</blockquote>
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</blockquote>
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</blockquote>
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<blockquote>
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<p>When floating point values are converted to integer, the value is rounded
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to the nearest integer. When integers and floating point values are converted
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to strings, an ascii representation of the value is produced. </p>
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<p>When strings are converted to integer or floating point values, the string
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is assumed to contain an ascii representation of a numeric value and converted
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accordingly. Conversion stops at the first non-numeric character in the string,
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or at the end of the string. </p>
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<p>The only arithmetic operation allowed on string is '+', which simply concatenates
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the two operands.</p>
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<p> Int, Float and Str can be used to convert values. They may be optionally
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followed by the appropriate type tag - ie: 'Int%', 'Str$' and 'Float#'. </p>
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<p>Comparison operators always produce an integer result: 1 for true, 0 for
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false. </p>
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<p>If one of the operators is a custom type object, the other must be an object
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of the same type, or 'Null', and the only comparisons allowed are '=' and
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'<>'. </p>
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<p>Bitwise and logical operators always convert their operands to integers and
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produce an integer result. </p>
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<p>The Not operator returns 0 for a non-zero operand, otherwise 1. When an expression
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is used to conditionally execute code - for example, in an 'If' statement
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- the result is converted to an integer value. A non-zero result means true,
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a zero result means false. </p>
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<p> </p>
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</blockquote>
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</body>
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</html> |