# creal(3) [osx man page]

CREAL(3) BSD Library Functions Manual CREAL(3)NAME

crealcomplex real-part function cimag--complex imaginary-part function--SYNOPSIS

#include <complex.h> double creal(double complex z); long double creall(long double complex z); float crealf(float complex z); double cimag(double complex z); long double cimagl(long double complex z); float cimagf(float complex z);DESCRIPTION

creal(z) extracts the real part of the complex floating-point number z. cimag(z) extracts the imaginary part of the complex floating-point number z. If z = x+iy, then creal(z) = x and cimag(z) = y.EXAMPLES

The function foo defined in the example below returns its complex argument with the imaginary part scaled by a factor of 2. #include <complex.h> double complex foo(double complex z) { return creal(z) + 2.0*cimag(z)*I; }SEE ALSO

complex(3)STANDARDS

The creal() and cimag() functions conform to ISO/IEC 9899:2011.4th Berkeley DistributionDecember 11, 2006 4th Berkeley Distribution

## Check Out this Related Man Page

CIMAG(3) BSD Library Functions Manual CIMAG(3)NAME

cimag, cimagf, cimagl, conj, conjf, conjl, cproj, cprojf, cprojl, creal, crealf, creallfunctions 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.BSD

August 7, 2008 BSD