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+    <h1 id="firstHeading" class="firstHeading">assert</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;assert.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">#ifdef NDEBUG
+#define assert(condition) ((void)0)
+#else
+#define assert(condition) /*implementation defined*/
+#endif</pre>
+</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr>  </table> <p>The definition of the macro <code>assert</code> depends on another macro, <code>NDEBUG</code>, which is not defined by the standard library.</p>
+<p>If <code>NDEBUG</code> is defined as a macro name at the point in the source code where <code>&lt;assert.h&gt;</code> is included, then <code>assert</code> does nothing.</p>
+<p>If <code>NDEBUG</code> is not defined, then <code>assert</code> checks if its argument (which must have scalar type) compares equal to zero. If it does, <code>assert</code> outputs implementation-specific diagnostic information on the standard error output and calls <code><a href="http://en.cppreference.com/w/c/program/abort"><span class="kw486">abort</span></a><span class="br0">(</span><span class="br0">)</span></code>. The diagnostic information is required to include the text of <code>expression</code>, as well as the values of <span class="t-rev-inl t-since-c99"><span> the <a href="../language/function_definition" title="c/language/function definition">predefined variable</a> <code>__func__</code> and of</span><span><span class="t-mark-rev t-since-c99">(since C99)</span></span></span> the <a href="../preprocessor/replace" title="c/preprocessor/replace">predefined macros</a> <code>__FILE__</code> and <code>__LINE__</code>.</p>
+<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> condition </td> <td> - </td> <td> expression of scalar type </td>
+</tr>
+</table> <h3 id="Return_value"> Return value</h3> <p>(none)</p>
+<h3 id="Notes"> Notes</h3> <p>There is no standardized interface to add an additional message to <code>assert</code> errors. A portable way to include one is to use a <a href="../language/operator_other#Comma_operator" title="c/language/operator other">comma operator</a>:</p>
+<div class="c source-c"><pre data-language="c">assert(("There are five lights", 2 + 2 == 5));</pre></div> <p>The implementation of <code>assert</code> in <a rel="nofollow" class="external text" href="https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/assert-macro-assert-wassert?view=msvc-160">Microsoft CRT</a> does not conform to C99 and later revisions, because its underlying function (<code>_wassert</code>) takes neither <code>__func__</code> nor an equivalent replacement.</p>
+<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;stdio.h&gt;
+// uncomment to disable assert()
+// #define NDEBUG
+#include &lt;assert.h&gt;
+#include &lt;math.h&gt;
+ 
+int main(void)
+{
+    double x = -1.0;
+    assert(x &gt;= 0.0);
+    printf("sqrt(x) = %f\n", sqrt(x));   
+ 
+    return 0;
+}</pre></div> <p>Output:</p>
+<div class="text source-text"><pre data-language="c">output with NDEBUG not defined:
+a.out: main.cpp:10: main: Assertion `x &gt;= 0.0' failed.
+ 
+output with NDEBUG defined:
+sqrt(x) = -nan</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C17 standard (ISO/IEC 9899:2018): </li>
+<ul><li> 7.2.1.1 The assert macro (p: 135) </li></ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul><li> 7.2.1.1 The assert macro (p: 186-187) </li></ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.2.1.1 The assert macro (p: 169) </li></ul>
+<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
+<ul><li> 4.2.1.1 The assert macro </li></ul>
+</ul>               <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="../program/abort" title="c/program/abort"> <span class="t-lines"><span>abort</span></span></a></div> </td> <td> causes abnormal program termination (without cleaning up) <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/error/assert" title="cpp/error/assert">C++ documentation</a></span> for <code>assert</code> </td>
+</tr> </table>           <div class="_attribution">
+  <p class="_attribution-p">
+    &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
+    <a href="https://en.cppreference.com/w/c/error/assert" class="_attribution-link">https://en.cppreference.com/w/c/error/assert</a>
+  </p>
+</div>