val (~:) : string list -> string
alias for String.concat
val (~%) : ('a, unit, string) format -> 'a
alias for sprintf
printing functions
val print : string -> unit
val eprint : string -> unit
val fprint : out_channel -> string -> unit
printing functions that add endlines
val printl : string -> unit
val eprintl : string -> unit
val fprintl : out_channel -> string -> unit
val lpad : ?fill:Char.t -> int -> string -> string
val rpad : ?fill:Char.t -> int -> string -> string
val i2s : int -> string
val f2s : float -> string