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| <title>Using as: Infix Ops</title> |
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| <a name="Infix-Ops"></a> |
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| <p> |
| Previous: <a href="Prefix-Ops.html#Prefix-Ops" accesskey="p" rel="prev">Prefix Ops</a>, Up: <a href="Integer-Exprs.html#Integer-Exprs" accesskey="u" rel="up">Integer Exprs</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Infix-Operators"></a> |
| <h4 class="subsection">6.2.4 Infix Operators</h4> |
| |
| <a name="index-infix-operators"></a> |
| <a name="index-operators_002c-permitted-arguments"></a> |
| <p><em>Infix operators</em> take two arguments, one on either side. Operators |
| have precedence, but operations with equal precedence are performed left |
| to right. Apart from <code>+</code> or <samp>-</samp>, both arguments must be |
| absolute, and the result is absolute. |
| </p> |
| <ol> |
| <li><a name="index-operator-precedence"></a> |
| <a name="index-precedence-of-operators"></a> |
| |
| </li><li> Highest Precedence |
| |
| <dl compact="compact"> |
| <dt><code>*</code></dt> |
| <dd><p><em>Multiplication</em>. |
| </p> |
| </dd> |
| <dt><code>/</code></dt> |
| <dd><p><em>Division</em>. Truncation is the same as the C operator ‘<samp>/</samp>’ |
| </p> |
| </dd> |
| <dt><code>%</code></dt> |
| <dd><p><em>Remainder</em>. |
| </p> |
| </dd> |
| <dt><code><<</code></dt> |
| <dd><p><em>Shift Left</em>. Same as the C operator ‘<samp><<</samp>’. |
| </p> |
| </dd> |
| <dt><code>>></code></dt> |
| <dd><p><em>Shift Right</em>. Same as the C operator ‘<samp>>></samp>’. |
| </p></dd> |
| </dl> |
| |
| </li><li> Intermediate precedence |
| |
| <dl compact="compact"> |
| <dt><code>|</code></dt> |
| <dd> |
| <p><em>Bitwise Inclusive Or</em>. |
| </p> |
| </dd> |
| <dt><code>&</code></dt> |
| <dd><p><em>Bitwise And</em>. |
| </p> |
| </dd> |
| <dt><code>^</code></dt> |
| <dd><p><em>Bitwise Exclusive Or</em>. |
| </p> |
| </dd> |
| <dt><code>!</code></dt> |
| <dd><p><em>Bitwise Or Not</em>. |
| </p></dd> |
| </dl> |
| |
| </li><li> Low Precedence |
| |
| <dl compact="compact"> |
| <dd><a name="index-addition_002c-permitted-arguments"></a> |
| <a name="index-plus_002c-permitted-arguments"></a> |
| <a name="index-arguments-for-addition"></a> |
| </dd> |
| <dt><code>+</code></dt> |
| <dd><p><em>Addition</em>. If either argument is absolute, the result has the section of |
| the other argument. You may not add together arguments from different |
| sections. |
| </p> |
| <a name="index-subtraction_002c-permitted-arguments"></a> |
| <a name="index-minus_002c-permitted-arguments"></a> |
| <a name="index-arguments-for-subtraction"></a> |
| </dd> |
| <dt><code>-</code></dt> |
| <dd><p><em>Subtraction</em>. If the right argument is absolute, the |
| result has the section of the left argument. |
| If both arguments are in the same section, the result is absolute. |
| You may not subtract arguments from different sections. |
| </p> |
| <a name="index-comparison-expressions"></a> |
| <a name="index-expressions_002c-comparison"></a> |
| </dd> |
| <dt><code>==</code></dt> |
| <dd><p><em>Is Equal To</em> |
| </p></dd> |
| <dt><code><></code></dt> |
| <dt><code>!=</code></dt> |
| <dd><p><em>Is Not Equal To</em> |
| </p></dd> |
| <dt><code><</code></dt> |
| <dd><p><em>Is Less Than</em> |
| </p></dd> |
| <dt><code>></code></dt> |
| <dd><p><em>Is Greater Than</em> |
| </p></dd> |
| <dt><code>>=</code></dt> |
| <dd><p><em>Is Greater Than Or Equal To</em> |
| </p></dd> |
| <dt><code><=</code></dt> |
| <dd><p><em>Is Less Than Or Equal To</em> |
| </p> |
| <p>The comparison operators can be used as infix operators. A true results has a |
| value of -1 whereas a false result has a value of 0. Note, these operators |
| perform signed comparisons. |
| </p></dd> |
| </dl> |
| |
| </li><li> Lowest Precedence |
| |
| <dl compact="compact"> |
| <dt><code>&&</code></dt> |
| <dd><p><em>Logical And</em>. |
| </p> |
| </dd> |
| <dt><code>||</code></dt> |
| <dd><p><em>Logical Or</em>. |
| </p> |
| <p>These two logical operations can be used to combine the results of sub |
| expressions. Note, unlike the comparison operators a true result returns a |
| value of 1 but a false results does still return 0. Also note that the logical |
| or operator has a slightly lower precedence than logical and. |
| </p> |
| </dd> |
| </dl> |
| </li></ol> |
| |
| <p>In short, it’s only meaningful to add or subtract the <em>offsets</em> in an |
| address; you can only have a defined section in one of the two arguments. |
| </p> |
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| Previous: <a href="Prefix-Ops.html#Prefix-Ops" accesskey="p" rel="prev">Prefix Ops</a>, Up: <a href="Integer-Exprs.html#Integer-Exprs" accesskey="u" rel="up">Integer Exprs</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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