411 REFERENCE · Wikibooks
C++ Language/Std/CRuntime/Math/ComplexNumbers
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Standard C++ defines a complex number as std::complex<float> ffVar(3.0F, 4.0F);.
Compute its "phase" using std::arg(), compute its "magnitude" using std::abs(), and compute its "complex conjugate" using std::conj().
Additional information about complex number functions (includes interactive examples)