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1.28 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.