complex.h workaround in Visual Studio

After some searching I've found that Microsoft Visual Studio does not provide the "complex.h" header file, but I have some C code that unfortunately uses it. I've tried using <complex> and compiling as C++ code; this requires changing

complex

to

_complex

I don't even know what I would need to change

long complex

to. Any ideas how I can get around this?

From stackoverflow

• Have you tried this link?

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  If you can't use third-party libraries, then I think you're going to be compelled to re-implement complex functionality yourself. The good news is that most complex math is actually really simple to write, unless you need some fairly advanced features.

• What are you expecting to be in complex.h? It is not, as far as I know, a standard C header file. It is however a pre-standard C++ header, but trying to use it with C code will obviously not work.