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99 lines
4.0 KiB
HTML
99 lines
4.0 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>gcvt (The Red Hat newlib C Library)</title>
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Stdlib.html#Stdlib" rel="up" title="Stdlib">
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<body lang="en">
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<a name="gcvt"></a>
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<div class="header">
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<p>
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Next: <a href="ecvtbuf.html#ecvtbuf" accesskey="n" rel="next">ecvtbuf</a>, Previous: <a href="ecvt.html#ecvt" accesskey="p" rel="prev">ecvt</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="gcvt_002c-gcvtf_002d_002d_002dformat-double-or-float-as-string"></a>
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<h3 class="section">2.14 <code>gcvt</code>, <code>gcvtf</code>—format double or float as string</h3>
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<a name="index-gcvt"></a>
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<a name="index-gcvtf"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdlib.h>
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char *gcvt(double <var>val</var>, int <var>precision</var>, char *<var>buf</var>);
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char *gcvtf(float <var>val</var>, int <var>precision</var>, char *<var>buf</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>gcvt</code> writes a fully formatted number as a null-terminated
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string in the buffer <code>*<var>buf</var></code>. <code>gcvtf</code> produces corresponding
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character representations of <code>float</code> numbers.
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</p>
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<p><code>gcvt</code> uses the same rules as the <code>printf</code> format
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‘<code>%.<var>precision</var>g</code>’—only negative values are signed (with
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‘<code>-</code>’), and either exponential or ordinary decimal-fraction format
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is chosen depending on the number of significant digits (specified by
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<var>precision</var>).
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The result is a pointer to the formatted representation of <var>val</var>
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(the same as the argument <var>buf</var>).
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</p>
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<br>
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<p><strong>Portability</strong><br>
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Neither function is ANSI C.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
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<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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<br>
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</html>
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