complex.h

The complex.h header file contains function declarations for all the complex math functions listed below.

The complex.h header file defines the following macros:
complex
expands to _Complex, where _Complex is a type specifier.
_Complex_I
expands to const float _Complex with the value of the imaginary unit
I
expands to _Complex_I
Compile requirement: Use of this header requires a compiler that is designed to support C99.