Defined in header
#define imaginary _Imaginary
This macro expands to the keyword _Imaginary.
This is a convenience macro that makes it possible to use float imaginary, double imaginary, and long double imaginary as an alternative way to write the three pure imaginary C types float _Imaginary, double _Imaginary, and long double _Imaginary
As with any pure imaginary number support in C, this macro is only defined if the imaginary numbers are supported.
A compiler that defines __STDC_IEC_559_COMPLEX__ is not required to support imaginary numbers. POSIX recommends checking if the macro _Imaginary_I is defined to identify imaginary number support.
Imaginary numbers are supported if __STDC_IEC_559_COMPLEX__ is defined.
Programs are allowed to undefine and perhaps redefine the imaginary macro.
z = 1.0-2.0i
- C17 standard (ISO/IEC 9899:2018):
- 7.3.1/5 imaginary (p: 136)
- G.6/1 imaginary (p: 391-392)
- C11 standard (ISO/IEC 9899:2011):
- 7.3.1/5 imaginary (p: 188)
- G.6/1 imaginary (p: 537)
- C99 standard (ISO/IEC 9899:1999):
- 7.3.1/3 imaginary (p: 170)
- G.6/1 imaginary (p: 472)
 See also
| complex type macro |