6.2.6 cabs Function

Calculates the complex absolute value of a double precision complex value.

Include

<complex.h>

Prototype

double complex cabs(double complex z);

Argument

z

value for which to return the complex absolute value

Return Value

Returns the complex absolute value (also known as the magnitude, modulus, or norm) of 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, y;

  x = -2.0 + 1.0*I;
  y = cabs(x);
  printf("The complex absolute value of %f + %fi is %f + %fi\n", creal(x), cimag(x), creal(y), cimag(y));
}

Example Output

The complex absolute value of -2.000000 + 1.000000i is 2.236068 + 0.000000i