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# Imaginary_I

From cppreference.com
< c‎ | numeric‎ | complex

Defined in header `<complex.h>` |  |
#define Imaginary_I /* unspecified */ |  | (since C99)

The `Imaginary_I` macro expands to a value of type const float _Imaginary with the value of the imaginary unit. The macro is defined only if the implementation supports imaginary types.

| This section is incomplete Reason: on what condition? The standard seems unclear. Maybe when __STDC_IEC_559_COMPLEX__ is defined?

### [edit] See also

Complex_I (C99) | the complex unit constant i (macro constant) [edit]
I (C99) | the complex or imaginary unit constant i (macro constant) [edit]

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