devdocs/c/numeric%2Fcomplex%2Fcomplex.html


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    <h1 id="firstHeading" class="firstHeading">complex</h1>            <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;complex.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl t-since-c99"> <td> <pre data-language="c">#define complex _Complex</pre>
</td> <td class="t-dcl-nopad"> </td> <td> <span class="t-mark-rev t-since-c99">(since C99)</span> </td> </tr>  </table> <p>This macro expands to a type specifier used to identify <a href="../../language/arithmetic_types#Complex_floating_types" title="c/language/arithmetic types">complex types</a>.</p>
<p>A program may undefine and perhaps then redefine the <code>complex</code> macro.</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;complex.h&gt;
#include &lt;math.h&gt;
 
void print_complex(const char* note, complex z)
{
    printf("%s %f%+f*i\n", note, creal(z), cimag(z));
}
 
int main(void)
{
    double complex z = -1.0 + 2.0*I;
    print_complex("z  =", z);
    print_complex("z\u00B2 =", z * z);
    double complex z2 = ccos(2.0 * carg(z)) + csin(2.0 * carg(z))*I;
    print_complex("z\u00B2 =", cabs(z) * cabs(z) * z2);
}</pre></div> <p>Output:</p>
<div class="text source-text"><pre data-language="c">z  = -1.000000+2.000000*i
z² = -3.000000-4.000000*i
z² = -3.000000-4.000000*i</pre></div> </div> <h3 id="References"> References</h3>  <ul>
<li> C17 standard (ISO/IEC 9899:2018): </li>
<ul><li> 7.3.1/4 complex (p: 136) </li></ul>
<li> C11 standard (ISO/IEC 9899:2011): </li>
<ul><li> 7.3.1/4 complex (p: 188) </li></ul>
<li> C99 standard (ISO/IEC 9899:1999): </li>
<ul><li> 7.3.1/2 complex (p: 170) </li></ul>
</ul>           <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="imaginary" title="c/numeric/complex/imaginary"> <span class="t-lines"><span>imaginary</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> imaginary type macro <br> <span class="t-mark">(keyword macro)</span>  </td>
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