From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/numeric%2Fcomplex%2Fimaginary_i.html | 46 -------------------------- 1 file changed, 46 deletions(-) delete mode 100644 devdocs/c/numeric%2Fcomplex%2Fimaginary_i.html (limited to 'devdocs/c/numeric%2Fcomplex%2Fimaginary_i.html') diff --git a/devdocs/c/numeric%2Fcomplex%2Fimaginary_i.html b/devdocs/c/numeric%2Fcomplex%2Fimaginary_i.html deleted file mode 100644 index 553a7a26..00000000 --- a/devdocs/c/numeric%2Fcomplex%2Fimaginary_i.html +++ /dev/null @@ -1,46 +0,0 @@ -

_Imaginary_I

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

The _Imaginary_I macro expands to a value of type const float _Imaginary with the value of the imaginary unit.

-

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

This macro allows for the precise way to assemble a complex number from its real and imaginary components, e.g. with (double complex)((double)x + _Imaginary_I * (double)y). This pattern was standardized in C11 as the macro CMPLX. Note that if _Complex_I is used instead, this expression is allowed to convert negative zero to positive zero in the imaginary position.

-

Example

#include <stdio.h>
-#include <complex.h>
-#include <math.h>
- 
-int main(void)
-{
-    double complex z1 = 0.0 + INFINITY * _Imaginary_I;
-    printf("z1 = %.1f%+.1fi\n", creal(z1), cimag(z1));
- 
-    double complex z2 = 0.0 + INFINITY * _Complex_I;
-    printf("z2 = %.1f%+.1fi\n", creal(z2), cimag(z2));
-}

Output:

-
z1 = 0.0+Infi 
-z2 = NaN+Infi

References

See also

- -
-
(C99)
 the complex 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/Imaginary_I -

-
-- cgit v1.2.3