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/* public domain rewrite of hypot */ #include <math.h> double hypot(double x, double y) { if (x < 0) x = -x; if (y < 0) y = -y; if (x < y) { double tmp = x; x = y; y = tmp; } if (y == 0.0) return x; y /= x; return x * sqrt(1.0+y*y); }