Is _Complex a macro or an operator?

Hello everyone,

I've trying to see where _Complex is defined but I found nothing. Is _Complex a macro, is it an operator? How does int _Complex work?
According to it is a keyword.
_Complex is a keyword, although the normal usage is throgh the macro complex

Also note that "int _Complex" is an error, the only complex types in C are double complex, float complex, and long double complex (or, alternatively, double _Complex, float _Complex, and long double _Complex).

If you're using gcc to compile a C program, make sure to pass -pedantic-errors in addition to -std=c99
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