complex
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header  <complex.h> | ||
| #define complex _Complex | (since C99) | |
This macro expands to a type specifier used to identify complex types.
A program may undefine and perhaps then redefine the complex macro.
References
- C11 standard (ISO/IEC 9899:2011):
- 7.3.1/4 complex (p: 188)
 
- C99 standard (ISO/IEC 9899:1999):
- 7.3.1/2 complex (p: 170)
 
See also
| (C99) | imaginary type macro (macro constant) |