Defined in header `<complex.h>` | ||
---|---|---|

#define imaginary _Imaginary | (since C99) |

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 |
(since C99) (until C11) |

Imaginary numbers are supported if | (since C11) |

Programs are allowed to undefine and perhaps redefine the `imaginary`

macro.

#include <stdio.h> #include <complex.h> int main(void) { double imaginary i = -2.0*I; // pure imaginary double f = 1.0; // pure real double complex z = f + i; // complex number printf("z = %.1f%+.1fi\n", creal(z), cimag(z)); }

Output:

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)

(C99) | complex type macro (keyword macro) |

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