missing/cbrt.c

   1 #include "ruby/missing.h"
   2 #include <math.h>
   3
   4 double cbrt(double x)
   5 {
   6     if (x < 0)
   7         return -pow(-x, 1/3.0);
   8     else
   9         return pow(x, 1/3.0);
  10 }
  11