17 Language support library [support]

17.14 C headers [support.c.headers]

17.14.2 Header <complex.h> synopsis [complex.h.syn]

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#include <complex>
1
#
The header <complex.h> behaves as if it simply includes the header <complex>.
2
#
[Note 1: 
Names introduced by <complex> in namespace std are not placed into the global namespace scope by <complex.h>.
— end note]