1.27 hypot, hypotf—distance from origin

Synopsis

     #include <math.h>
     double hypot(double x, double y);
     float hypotf(float x, float y);
     

Description
hypot calculates the Euclidean distance sqrt(x*x + y*y) between the origin (0,0) and a point represented by the Cartesian coordinates (x,y). hypotf differs only in the type of its arguments and result.

Returns
Normally, the distance value is returned. On overflow, hypot returns HUGE_VAL and sets errno to ERANGE.

You can change the error treatment with matherr.

Portability
hypot and hypotf are not ANSI C.