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+    <h1 id="firstHeading" class="firstHeading">strtof, strtod, strtold</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;stdlib.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">float       strtof( const char *restrict str, char **restrict str_end );</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-until-c99"> <td><pre data-language="c">double      strtod( const char          *str, char          **str_end );</pre></td> <td class="t-dcl-nopad"> </td> <td><span class="t-mark-rev t-until-c99">(until C99)</span></td> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">double      strtod( const char *restrict str, char **restrict str_end );</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">long double strtold( const char *restrict str, char **restrict str_end );</pre>
+</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr>  </table> <p>Interprets a floating-point value in a byte string pointed to by <code>str</code>.</p>
+<p>Function discards any whitespace characters (as determined by <code><a href="isspace" title="c/string/byte/isspace">isspace</a></code>) until first non-whitespace character is found. Then it takes as many characters as possible to form a valid floating-point representation and converts them to a floating-point value. The valid floating-point value can be one of the following:</p>
+<ul>
+<li>decimal floating-point expression. It consists of the following parts: </li>
+<ul>
+<li> <span class="t-mark">(optional)</span> plus or minus sign </li>
+<li> nonempty sequence of decimal digits optionally containing decimal-point character (as determined by the current C <a href="../../locale/setlocale" title="c/locale/setlocale">locale</a>) (defines significand) </li>
+<li> <span class="t-mark">(optional)</span> <code>e</code> or <code>E</code> followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent to base 10) </li>
+</ul>
+</ul>  <table class="t-rev-begin"> <tr class="t-rev t-since-c99">
+<td> <ul>
+<li>hexadecimal floating-point expression. It consists of the following parts: </li>
+<ul>
+<li> <span class="t-mark">(optional)</span> plus or minus sign </li>
+<li> <code>0x</code> or <code>0X</code> </li>
+<li> nonempty sequence of hexadecimal digits optionally containing a decimal-point character (as determined by the current C <a href="../../locale/setlocale" title="c/locale/setlocale">locale</a>) (defines significand) </li>
+<li> <span class="t-mark">(optional)</span> <code>p</code> or <code>P</code> followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent to base 2) </li>
+</ul>
+<li> infinity expression. It consists of the following parts: </li>
+<ul>
+<li> <span class="t-mark">(optional)</span> plus or minus sign </li>
+<li> <code>INF</code> or <code>INFINITY</code> ignoring case </li>
+</ul>
+<li> not-a-number expression. It consists of the following parts: </li>
+<ul>
+<li> <span class="t-mark">(optional)</span> plus or minus sign </li>
+<li> <code>NAN</code> or <code>NAN(</code><i>char_sequence</i><code>)</code> ignoring case of the <code>NAN</code> part. <i>char_sequence</i> can only contain digits, Latin letters, and underscores. The result is a quiet NaN floating-point value. </li>
+</ul>
+</ul>      </td> <td><span class="t-mark-rev t-since-c99">(since C99)</span></td>
+</tr> </table> <ul><li> any other expression that may be accepted by the currently installed C <a href="../../locale/setlocale" title="c/locale/setlocale">locale</a> </li></ul> <p>The functions sets the pointer pointed to by <code>str_end</code> to point to the character past the last character interpreted. If <code>str_end</code> is a null pointer, it is ignored.</p>
+<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> str </td> <td> - </td> <td> pointer to the null-terminated byte string to be interpreted </td>
+</tr> <tr class="t-par"> <td> str_end </td> <td> - </td> <td> pointer to a pointer to character. </td>
+</tr>
+</table> <h3 id="Return_value"> Return value</h3> <p>Floating-point value corresponding to the contents of <code>str</code> on success. If the converted value falls out of range of corresponding return type, range error occurs (<code><a href="../../error/errno" title="c/error/errno">errno</a></code> is set to <code><a href="../../error/errno_macros" title="c/error/errno macros">ERANGE</a></code>) and <code><a href="../../numeric/math/huge_val" title="c/numeric/math/HUGE VAL">HUGE_VAL</a></code>, <code><a href="../../numeric/math/huge_val" title="c/numeric/math/HUGE VAL">HUGE_VALF</a></code> or <code><a href="../../numeric/math/huge_val" title="c/numeric/math/HUGE VAL">HUGE_VALL</a></code> is returned. If no conversion can be performed, <code>​0​</code> is returned.</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;errno.h&gt;
+#include &lt;stdlib.h&gt;
+ 
+int main(void)
+{
+    // parsing with error handling
+    const char *p = "111.11 -2.22 Nan nan(2) inF 0X1.BC70A3D70A3D7P+6  1.18973e+4932zzz";
+    printf("Parsing '%s':\n", p);
+    char *end;
+    for (double f = strtod(p, &amp;end); p != end; f = strtod(p, &amp;end))
+    {
+        printf("'%.*s' -&gt; ", (int)(end-p), p);
+        p = end;
+        if (errno == ERANGE){
+            printf("range error, got ");
+            errno = 0;
+        }
+        printf("%f\n", f);
+    }
+ 
+    // parsing without error handling
+    printf("\"  -0.0000000123junk\"  --&gt;  %g\n", strtod("  -0.0000000123junk", NULL));
+    printf("\"junk\"                 --&gt;  %g\n", strtod("junk", NULL));
+}</pre></div> <p>Possible output:</p>
+<div class="text source-text"><pre data-language="c">Parsing '111.11 -2.22 Nan nan(2) inF 0X1.BC70A3D70A3D7P+6  1.18973e+4932zzz':
+'111.11' -&gt; 111.110000
+' -2.22' -&gt; -2.220000
+' Nan' -&gt; nan
+' nan(2)' -&gt; nan
+' inF' -&gt; inf
+' 0X1.BC70A3D70A3D7P+6' -&gt; 111.110000
+'  1.18973e+4932' -&gt; range error, got inf
+"  -0.0000000123junk"  --&gt;  -1.23e-08
+"junk"                 --&gt;  0</pre></div> </div> <h3 id="References"> References</h3>  <ul>
+<li> C17 standard (ISO/IEC 9899:2018): </li>
+<ul><li> 7.22.1.3 The strtod, strtof, and strtold functions (p: 249-251) </li></ul>
+<li> C11 standard (ISO/IEC 9899:2011): </li>
+<ul><li> 7.22.1.3 The strtod, strtof, and strtold functions (p: 342-344) </li></ul>
+<li> C99 standard (ISO/IEC 9899:1999): </li>
+<ul><li> 7.20.1.3 The strtod, strtof, and strtold functions (p: 308-310) </li></ul>
+<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
+<ul><li> 4.10.1.4 The strtod function </li></ul>
+</ul>               <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="atof" title="c/string/byte/atof"> <span class="t-lines"><span>atof</span></span></a></div> </td> <td> converts a byte string to a floating-point value <br> <span class="t-mark">(function)</span>  </td>
+</tr> <tr class="t-dsc"> <td> <div><a href="../wide/wcstof" title="c/string/wide/wcstof"> <span class="t-lines"><span>wcstof</span><span>wcstod</span><span>wcstold</span></span></a></div>
+<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div> </td> <td> converts a wide string to a floating-point value <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/string/byte/strtof" title="cpp/string/byte/strtof">C++ documentation</a></span> for <code>strtof, strtod, strtold</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/string/byte/strtof" class="_attribution-link">https://en.cppreference.com/w/c/string/byte/strtof</a>
+  </p>
+</div>