missing/hypot.c

   1 /* public domain rewrite of hypot */
   2
   3 #include <math.h>
   4
   5 double hypot(double x, double y)
   6 {
   7     if (x < 0) x = -x;
   8     if (y < 0) y = -y;
   9     if (x < y) {
  10         double tmp = x;
  11         x = y; y = tmp;
  12     }
  13     if (y == 0.0) return x;
  14     y /= x;
  15     return x * sqrt(1.0+y*y);
  16 }