aattaann() -- Mathematics Function (libm)

Calculate inverse tangent
#iinncclluuddee <mmaatthh.hh>
ddoouubbllee aattaann(_a_r_g) ddoouubbllee _a_r_g;

aattaann() calculates the inverse tangent of _a_r_g, which may be any real number.
The result will be in the range [-pi/2, pi/2].

_E_x_a_m_p_l_e
For an example of this function, see the entry for aaccooss().

_S_e_e _A_l_s_o
eerrrrnnoo, lliibbmm, ttaann()
ANSI Standard, section 7.5.2.3
POSIX Standard, section 8.1
