Printf

`sig val fprintf : Pervasives.out_channel -> ('a, Pervasives.out_channel, unit) Pervasives.format -> 'a val printf : ('a, Pervasives.out_channel, unit) Pervasives.format -> 'a val eprintf : ('a, Pervasives.out_channel, unit) Pervasives.format -> 'a val sprintf : ('a, unit, string) Pervasives.format -> 'a val bprintf : Buffer.t -> ('a, Buffer.t, unit) Pervasives.format -> 'a val ifprintf : 'b -> ('a, 'b, 'c, unit) Pervasives.format4 -> 'a val kfprintf : (Pervasives.out_channel -> 'd) -> Pervasives.out_channel -> ('a, Pervasives.out_channel, unit, 'd) Pervasives.format4 -> 'a val ikfprintf : ('b -> 'd) -> 'b -> ('a, 'b, 'c, 'd) Pervasives.format4 -> 'a val ksprintf : (string -> 'd) -> ('a, unit, string, 'd) Pervasives.format4 -> 'a val kbprintf : (Buffer.t -> 'd) -> Buffer.t -> ('a, Buffer.t, unit, 'd) Pervasives.format4 -> 'a val kprintf : (string -> 'b) -> ('a, unit, string, 'b) Pervasives.format4 -> 'a end`