HP-UX Reference (11i v1 05/09) - 3 Library Functions A-M (vol 6)

hypot(3M) hypot(3M)

NAME

hypot() - Euclidean distance function

SYNOPSIS

#include <math.h>

double hypot(double x, double y);

DESCRIPTION

hypot() returns sqrt(x*x+y

*y), taking precautions against unwarranted overﬂows.

The ISO/ANSI C committee has approved the

hypot() function for inclusion in the C9X draft standard.

To use this function, compile either with the default

-Ae option or with the -Aa and -D_HPUX_SOURCE

options. Make sure your program includes <

math.h>. Link in the math library by specifying -lm on the

compiler or linker command line.

RETURN VALUE

If x or y is NaN,

hypot() returns NaN.

If the correct value would overﬂow,

hypot() returns HUGE_VAL.

If the correct value after rounding would be smaller in magnitude than MINDOUBLE, hypot() returns

zero.

ERRORS

No errors are deﬁned.