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diff --git a/devdocs/c/numeric%2Fmath%2Ffloat_t.html b/devdocs/c/numeric%2Fmath%2Ffloat_t.html new file mode 100644 index 00000000..e9783b11 --- /dev/null +++ b/devdocs/c/numeric%2Fmath%2Ffloat_t.html @@ -0,0 +1,34 @@ + <h1 id="firstHeading" class="firstHeading">float_t, double_t</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code><math.h></code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">typedef /*implementation defined*/ float_t</pre> +</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">typedef /*implementation defined*/ double_t</pre> +</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr> </table> <p>The types <code>float_t</code> and <code>double_t</code> are floating types at least as wide as <code>float</code> and <code>double</code>, respectively, and such that <code>double_t</code> is at least as wide as <code>float_t</code>. The value of <code><a href="../../types/limits/flt_eval_method" title="c/types/limits/FLT EVAL METHOD">FLT_EVAL_METHOD</a></code> determines the types of <code>float_t</code> and <code>double_t</code>.</p> +<table class="t-dsc-begin"> <tr class="t-dsc-hitem"> <th> FLT_EVAL_METHOD </th> <th> Explanation </th> +</tr> <tr class="t-dsc"> <td> <code>0</code> </td> <td> <code>float_t</code> and <code>double_t</code> are equivalent to <code>float</code> and <code>double</code>, respectively </td> +</tr> <tr class="t-dsc"> <td> <code>1</code> </td> <td> both <code>float_t</code> and <code>double_t</code> are equivalent to <code>double</code> </td> +</tr> <tr class="t-dsc"> <td> <code>2</code> </td> <td> both <code>float_t</code> and <code>double_t</code> are equivalent to <code>long double</code> </td> +</tr> <tr class="t-dsc"> <td> <code>other</code> </td> <td> both <code>float_t</code> and <code>double_t</code> are implementation defined </td> +</tr> </table> <h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include <float.h> +#include <math.h> +#include <stdio.h> + +int main(void) +{ + printf("%d\n", FLT_EVAL_METHOD); + printf("%zu %zu\n", sizeof(float),sizeof(float_t)); + printf("%zu %zu\n", sizeof(double),sizeof(double_t)); + return 0; +}</pre></div> <p>Possible output:</p> +<div class="text source-text"><pre data-language="c">0 +4 4 +8 8</pre></div> </div> <h3 id="References"> References</h3> <ul> +<li> C11 standard (ISO/IEC 9899:2011): </li> +<ul><li> 7.12 Mathematics <math.h> (p: 231) </li></ul> +<li> C99 standard (ISO/IEC 9899:1999): </li> +<ul><li> 7.12 Mathematics <math.h> (p: 212) </li></ul> +</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="../../types/limits/flt_eval_method" title="c/types/limits/FLT EVAL METHOD"> <span class="t-lines"><span>FLT_EVAL_METHOD</span></span></a></div> +<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> use of extended precision for intermediate results: 0 not used, 1 <code>double</code> is used instead of <code>float</code>, 2: <code>long double</code> is used <br> <span class="t-mark">(macro constant)</span> </td> +</tr> </table> <div class="_attribution"> + <p class="_attribution-p"> + © cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br> + <a href="https://en.cppreference.com/w/c/numeric/math/float_t" class="_attribution-link">https://en.cppreference.com/w/c/numeric/math/float_t</a> + </p> +</div> |