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2.7 catan, catanf—complex arc tangent

Synopsis 

     #include <complex.h>
     double complex catan(double complex z);
     float complex catanf(float complex z);

Description
These functions compute the complex arc tangent of z, with branch cuts outside the interval [-i, +i] along the imaginary axis.

catanf is identical to catan, except that it performs its calculations on floats complex.
Returns
These functions return the complex arc tangent value, in the range of a strip mathematically unbounded along the imaginary axis and in the interval [-pi/2, +pi/2] along the real axis.
Portability
catan and catanf are ISO C99