10.20.1 New Features

• New format/[2,3] format sequences:

  `~Nh'

  `~NH'

  (Print float precisely.) The argument is a float, which will be printed in `f' or `e' (or `E' if `H' is used) notation with d significant digits, where d is the smallest number of digits that will yield the same float when read in. `E' notation is used if N<0 or if the exponent is less than -N-1 or greater than or equal to N+d, otherwise `f' notation. N defaults to 3.

• New write_term/[2,3] options:

  character_escapes(+Boolean)

  If selected, quoted atoms containing special characters will be printed using escape sequences. The default value depends on the character_escapes Prolog flag.
  

  float_format(+Spec)

  How to print floats. Spec should be an atom of the form `~NC', like one of the format sequences for printing floats. The default is `~H'.
  

  priority(+Prio)

  The term is printed as if in the context of an associative operator of precedence Prio, where Prio is an integer. The default is 1200.