C in a Nutshell

Name

catan

Synopsis

Calculates the inverse tangent of a complex number

#include <complex.h>
double complexcatan( double complex z );
float complex catanf( float complex z );
long double complex catanl( double long complex z );

The catan() functions accept a complex number as their argument and return a complex number, but otherwise work the same as atan().

Example

double complex v, w, z ;
double a = 0.0, b = 0.0;

puts("Enter the real and imaginary parts of a complex number:");
if ( scanf("%lf %lf", &a, &b) == 2)
{
  z = a + b * I;
  printf( "z = %.2f %+.2f*I.\n", creal(z), cimag(z) );

  v =catan(z);
  w = catanh(z);
  printf( "z is the tangent of %.2f %+.2f*I\n",  creal(v), cimag(v) );
  printf( "and the hyperbolic tangent of %.2f %+.2f*I.\n",
          creal(w), cimag(w) );
}
else
  printf("Invalid input. \n");

This code produces output like the following:

Enter the real and imaginary parts of a complex number:30 30
z = 30.00 +30.00*I.
z is the tangent of 1.55 +0.02*I
and the hyperbolic tangent of 0.02 +1.55*I.

See Also

ccos(), csin(), ctan(), cacos(), casin()