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| <h3 class="section">2.14 <code>gvcvt</code>, <code>gcvtf</code>—format double or float as string</h3> |
| |
| <p><a name="index-gcvt-24"></a><a name="index-gcvtf-25"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdlib.h> |
| |
| char *gcvt(double <var>val</var>, int <var>precision</var>, char *<var>buf</var>); |
| char *gcvtf(float <var>val</var>, int <var>precision</var>, char *<var>buf</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>gcvt</code> writes a fully formatted number as a null-terminated |
| string in the buffer <code>*</code><var>buf</var>. <code>gdvtf</code> produces corresponding |
| character representations of <code>float</code> numbers. |
| |
| <p><code>gcvt</code> uses the same rules as the <code>printf</code> format |
| `<code>%.</code><var>precision</var><code>g</code>'—only negative values are signed (with |
| `<code>-</code>'), and either exponential or ordinary decimal-fraction format |
| is chosen depending on the number of significant digits (specified by |
| <var>precision</var>). |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The result is a pointer to the formatted representation of <var>val</var> |
| (the same as the argument <var>buf</var>). |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| Neither function is ANSI C. |
| |
| <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>, |
| <code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>. |
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