Returns the absolute value of a complex number.

    Format

      #include  <math.h>

      double cabs  (cabs_t z);

      float cabsf  (cabsf_t z); (Integrity servers, Alpha)

      long double cabsl  (cabsl_t z); (Integrity servers, Alpha)

1  –  Argument

 z

    A structure of type cabs_t, cabsf_t, or cabsl_t. These types are
    defined in the <math.h> header file as follows:

    typedef struct {double x,y;} cabs_t;

    typedef struct { float x, y; } cabsf_t; (Integrity servers, Alpha)
    typedef struct { long double x, y; } cabsl_t; (Integrity servers, Alpha)

2  –  Description

    The cabs functions return the absolute value of a complex number
    by computing the Euclidean distance between its two points as the
    square root of their respective squares:

    sqrt(x2 + y2)

    On overflow, the return value is undefined.

    The cabs, cabsf, and cabsl functions are equivalent to the hypot,
    hypotf, and hypotl functions, respectively.