Ruby  1.9.3p551(2014-11-13revision48407)
cbrt.c
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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 
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