C in a Nutshell (In a Nutshell (OReilly))

Obtains the real part of a complex number

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

A complex number is represented as two floating-point numbers, one quantifying the real part and one quantifying the imaginary part. The creal( ) function returns the floating-point number that represents the real part of the complex argument.

Example

double complex z = 4.5 - 6.7 * I; printf( "The complex variable z is equal to %.2f %+.2f \xD7 I.\n", creal(z), cimag(z) );

This code produces the following output:

The complex variable z is equal to 4.50 -6.70 x I.

See Also

cimag( ), cabs( ), carg( ), conj( ), cproj( )