====== cexp ======
<code c>
double complex cexp(double complex z);
</code>

==== description of cexp ====
calculate the complex exponential

<code c>
#include <stdio.h>
#include <complex.h>

int main( void )
{

   double complex z=4.2424 + I*(-2.41231);
   double result;
   result = cexp(z);
   printf("cexp(%f + (%f)*I) = %f + (%f)*I\n",creal(z), cimag(z),creal(result),cimag(result));
   return 0;
}

</code>

===== output of cexp c example =====
    cexp(4.242400 + (-2.412310)*I) = -51.878503 + (0.000000)*I