6.2.54 creal Function

Calculates the real part of a double precision complex value.

Include

<complex.h>

Prototype

double complex creal(double complex z);

Argument

z

value for which to return the real part

Return Value

Returns the real part of the double precision complex value z.

Example

See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

#include <stdio.h>
#include <complex.h>

int main(void)
{
  double complex x;

  x = -2.0 + 1.0*I;
  printf("The real part of %f + %fi is %f\n", creal(x), cimag(x), creal(x));
}

Example Output

The real part of -2.000000 + 1.000000i is -2.000000