View source for cpp/numeric/complex/atan

===Example===
{{example|
|code=
#include <cmath>
#include <complex>
#include <iostream>

int main()
{
    std::cout << std::fixed;
    std::complex<double> z1(0.0, 2.0);
    std::cout << "atan" << z1 << " = " << std::atan(z1) << '\n';

    std::complex<double> z2(-0.0, 2.0);
    std::cout << "atan" << z2 << " (the other side of the cut) = "
              << std::atan(z2) << '\n';

    std::complex<double> z3(0.0, INFINITY);
    std::cout << "2 * atan" << z3 << " = " << 2.0 * std::atan(z3) << '\n';
}
|output=
atan(0.000000,2.000000) = (1.570796,0.549306)
atan(-0.000000,2.000000) (the other side of the cut) = (-1.570796,0.549306)
2 * atan(0.000000,inf) = (3.141593,0.000000)
}}