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authorCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
committerCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
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- <h2 class="chapter">Numbers</h2> <p>GNU Emacs supports two numeric data types: <em>integers</em> and <em>floating-point numbers</em>. Integers are whole numbers such as -3, 0, 7, 13, and 511. Floating-point numbers are numbers with fractional parts, such as -4.5, 0.0, and 2.71828. They can also be expressed in exponential notation: ‘<samp>1.5e2</samp>’ is the same as ‘<samp>150.0</samp>’; here, ‘<samp>e2</samp>’ stands for ten to the second power, and that is multiplied by 1.5. Integer computations are exact. Floating-point computations often involve rounding errors, as the numbers have a fixed amount of precision. </p> <table class="menu" border="0" cellspacing="0"> <tr>
-<td align="left" valign="top">• <a href="integer-basics" accesskey="1">Integer Basics</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Representation and range of integers. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="float-basics" accesskey="2">Float Basics</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Representation and range of floating point. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="predicates-on-numbers" accesskey="3">Predicates on Numbers</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Testing for numbers. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="comparison-of-numbers" accesskey="4">Comparison of Numbers</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Equality and inequality predicates. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="numeric-conversions" accesskey="5">Numeric Conversions</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Converting float to integer and vice versa. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="arithmetic-operations" accesskey="6">Arithmetic Operations</a>
-</td>
-<td> </td>
-<td align="left" valign="top">How to add, subtract, multiply and divide. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="rounding-operations" accesskey="7">Rounding Operations</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Explicitly rounding floating-point numbers. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="bitwise-operations" accesskey="8">Bitwise Operations</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Logical and, or, not, shifting. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="math-functions" accesskey="9">Math Functions</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Trig, exponential and logarithmic functions. </td>
-</tr> <tr>
-<td align="left" valign="top">• <a href="random-numbers">Random Numbers</a>
-</td>
-<td> </td>
-<td align="left" valign="top">Obtaining random integers, predictable or not. </td>
-</tr> </table><div class="_attribution">
- <p class="_attribution-p">
- Copyright &copy; 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
- <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Numbers.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Numbers.html</a>
- </p>
-</div>