hypot

hypot, hypotf, hypotl

Defined in header <math.h>
float       hypotf( float x, float y );
(1) (since C99)
double      hypot( double x, double y );
(2) (since C99)
long double hypotl( long double x, long double y );
(3) (since C99)
Defined in header <tgmath.h>
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