The_Imaginary_I macro expands to a value of typeconstfloat _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.

[edit]Notes

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

[edit]Example

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

z1 = 0.0+Infi z2 = NaN+Infi

[edit]References

• In other languages

• العربية
• Česky
• Deutsch
• Español
• Français
• Italiano
• 日本語
• 한국어
• Polski
• Português
• Русский
• Türkçe
• 中文