#include <math.h>

unsigned int
float_prec_len (float f)
{
  unsigned int prec_len, mult_by_factor = 1;
  float num;
  for (prec_len = 1; ; prec_len++)
    {
      mult_by_factor *= 10;
      num = (float) mult_by_factor * f;
      if (floor (num) == num)
        return prec_len;
      if (prec_len == 6)
        break;
    }
  return 1; /* Never reached? */
}