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creal(3)                 BSD Library Functions Manual                 creal(3)


NAME

     creal -- complex 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 argu-
     ment 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 9899:1999(E).

4th Berkeley Distribution      December 11, 2006     4th Berkeley Distribution

Mac OS X 10.6 - Generated Thu Sep 17 20:19:00 CDT 2009
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