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Synopsis:
    #include <math.h>
    double cabs( struct complex value );

    struct _complex {
        double  x;  /* real part */
        double  y;  /* imaginary part */
    };

Description:
    The cabs function computes the absolute value of the complex number
    value by a calculation which is equivalent to

    sqrt( (value.x*value.x) + (value.y*value.y) )

    In certain cases, overflow errors may occur which will cause the
     matherr routine to be invoked.

Returns:
    The absolute value is returned.

Example:
    #include <stdio.h>
    #include <math.h>

    struct _complex c = { -3.0, 4.0 };

    void main()
      {
        printf( "%f\n", cabs( c ) );
      }

    produces the following:

    5.000000

Classification:
    WATCOM

Systems:
    All