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_Imaginary_I

From cppreference.com

< c‎ | numeric‎ | complex

Compiler support
Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Strings library
Algorithms
Numerics
Date and time utilities
Input/output support
Localization support
Concurrency support (C11)
Technical Specifications
Symbol index

Common mathematical functions
Floating-point environment (C99)
Pseudo-random number generation
Complex number arithmetic (C99)
Type-generic math (C99)
Bit manipulation (C23)
Checked integer arithmetic (C23)

Complex number arithmetic

Types and the imaginary constant

complex (C99)
_Complex_I (C99)
CMPLX (C11)

imaginary (C99)
_Imaginary_I (C99)
I (C99)

Manipulation

cimag (C99)
creal (C99)
carg (C99)

cabs (C99)
conj (C99)
cproj (C99)

Power and exponential functions

cexp (C99)