NAME

cimag, cimagf, cimagl, conj, conjf, conjl, cproj, cprojf, cprojl, creal, crealf, creall —

functions to manipulate complex numbers

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <complex.h>

double
cimag(double complex z);

float
cimagf(float complex z);

long double
cimagl(long double complex z);

double complex
conj(double complex z);

float complex
conjf(float complex z);

long double complex
conjl(long double complex z);

double complex
cproj(double complex z);

float complex
cprojf(float complex z);

long double complex
cprojl(long double complex z);

double
creal(double complex z);

float
crealf(float complex z);

long double
creall(long double complex z);

DESCRIPTION

Let a+b*i denote the complex number z.

The creal() functions return the real part a, and the cimag() functions return the imaginary part b.

The conj() functions return the complex conjugate a-b*i.

The cproj() functions return the projection onto the Riemann sphere. If z contains an infinite component, then the result is infinity ± 0*i, where the (zero) imaginary part of the result has the same sign as b. Otherwise, the result is z.

These functions do not signal any floating point exceptions.

STANDARDS

The cimag(), conj(), cproj(), and creal() functions conform to ISO/IEC 9899:1999 (“ISO C99”).

HISTORY

The cimag(), conj() and creal() functions first appeared in FreeBSD 5.3. The cproj() functions appeared in FreeBSD 8.0.