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imaginary

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 __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.

-		 -(since C99)
(until C11) -

Imaginary numbers are supported if __STDC_IEC_559_COMPLEX__ is defined.

-		 (since C11)

Notes

Programs are allowed to undefine and perhaps redefine the imaginary macro.

-

Example

#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

References

See also

-
-
(C99)
 complex type macro
(keyword macro)
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/numeric/complex/imaginary -

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