#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.
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.
[edit] 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[edit] References
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