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_Complex_I

Defined in header <complex.h> 
#define _Complex_I /* unspecified */
-		 (since C99)

The _Complex_I macro expands to a value of type const float _Complex with the value of the imaginary unit.

-

Notes

This macro may be used when I is not available, such as when it has been undefined by the application.

-

Unlike _Imaginary_I and CMPLX, use of this macro to construct a complex number may lose the sign of zero on the imaginary part.

-

Example

#include <stdio.h>
-#include <complex.h>
- 
-#undef I
-#define J _Complex_I // can be used to redefine I
- 
-int main(void)
-{
-    // can be used to construct a complex number
-    double complex z = 1.0 + 2.0 * _Complex_I;
-    printf("1.0 + 2.0 * _Complex_I = %.1f%+.1fi\n", creal(z), cimag(z));
- 
-    // sign of zero may not be preserved
-    double complex z2 = 0.0 + -0.0 * _Complex_I;
-    printf("0.0 + -0.0 * _Complex_I = %.1f%+.1fi\n", creal(z2), cimag(z2));
-}

Possible output:

-
1.0 + 2.0 * _Complex_I = 1.0+2.0i
-0.0 + -0.0 * _Complex_I = 0.0+0.0i

References

See also

- -
-
(C99)
 the imaginary unit constant i
(macro constant)
-
(C99)
 the complex or imaginary unit constant i
(macro constant)
-

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

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