Standard library header <ccomplex> (C++11)(until C++20), <complex.h> (C++11)

This header was originally in the C standard library as <complex.h>.

Includes
<complex> (C++11)	Complex number type[edit]

<ccomplex> is deprecated in C++17 and removed in C++20. Corresponding <complex.h> is still available in C++20.

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