devdocs/c/numeric%2Fmath%2Fislessequal.html


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    <h1 id="firstHeading" class="firstHeading">islessequal</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;math.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">#define islessequal(x, y) /* implementation defined */</pre>
</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr>  </table> <p>Determines if the floating point number <code>x</code> is less than or equal to the floating-point number <code>y</code>, without setting floating-point exceptions.</p>
<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> x </td> <td> - </td> <td> floating point value </td>
</tr> <tr class="t-par"> <td> y </td> <td> - </td> <td> floating point value </td>
</tr>
</table> <h3 id="Return_value"> Return value</h3> <p>Nonzero integral value if <code>x &lt;= y</code>, <code>0</code> otherwise.</p>
<h3 id="Notes"> Notes</h3> <p>The built-in <code>operator&lt;=</code> for floating-point numbers may raise <code><a href="../fenv/fe_exceptions" title="c/numeric/fenv/FE exceptions">FE_INVALID</a></code> if one or both of the arguments is NaN. This function is a "quiet" version of <code>operator&lt;=</code>.</p>
<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;stdio.h&gt;
#include &lt;math.h&gt;
 
int main(void)
{
    printf("islessequal(2.0,1.0)      = %d\n", islessequal(2.0,1.0));
    printf("islessequal(1.0,2.0)      = %d\n", islessequal(1.0,2.0));
    printf("islessequal(1.0,1.0)      = %d\n", islessequal(1.0,1.0));
    printf("islessequal(INFINITY,1.0) = %d\n", islessequal(INFINITY,1.0));
    printf("islessequal(1.0,NAN)      = %d\n", islessequal(1.0,NAN));
 
    return 0;
}</pre></div> <p>Possible output:</p>
<div class="text source-text"><pre data-language="c">islessequal(2.0,1.0)      = 0
islessequal(1.0,2.0)      = 1
islessequal(1.0,1.0)      = 1
islessequal(INFINITY,1.0) = 0
islessequal(1.0,NAN)      = 0</pre></div> </div> <h3 id="References"> References</h3>  <ul>
<li> C11 standard (ISO/IEC 9899:2011): </li>
<ul>
<li> 7.12.14.4 The islessequal macro (p: 260) </li>
<li> F.10.11 Comparison macros (p: 531) </li>
</ul>
<li> C99 standard (ISO/IEC 9899:1999): </li>
<ul><li> 7.12.14.4 The islessequal macro (p: 241) </li></ul>
</ul>       <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="isgreaterequal" title="c/numeric/math/isgreaterequal"> <span class="t-lines"><span>isgreaterequal</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> checks if the first floating-point argument is greater or equal than the second <br> <span class="t-mark">(function macro)</span>  </td>
</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/numeric/math/islessequal" title="cpp/numeric/math/islessequal">C++ documentation</a></span> for <code>islessequal</code> </td>
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