NAME
DLAPY2 - return sqrt(x**2+y**2), taking care not to cause unnecessary overflow
SYNOPSIS
DOUBLE PRECISION
FUNCTION DLAPY2( X, Y )
PURPOSE
DLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary overflow.
ARGUMENTS
X (input) DOUBLE PRECISION
Y (input) DOUBLE PRECISION
X and Y specify the values x and y.