Module Printf

module Printf: sig .. end
Formatted output functions.

let fprintf:
  (
    Pervasives.out_channel,
    Pervasives.format('a, Pervasives.out_channel, unit)
  ) =>
  'a;
fprintf outchan format arg1 ... argN formats the arguments arg1 to argN according to the format string format, and outputs the resulting string on the channel outchan.

The format string is a character string which contains two types of objects: plain characters, which are simply copied to the output channel, and conversion specifications, each of which causes conversion and printing of arguments.

Conversion specifications have the following form:

% [flags] [width] [.precision] type

In short, a conversion specification consists in the % character, followed by optional modifiers and a type which is made of one or two characters.

The types and their meanings are:

The optional flags are: The optional width is an integer indicating the minimal width of the result. For instance, %6d prints an integer, prefixing it with spaces to fill at least 6 characters.

The optional precision is a dot . followed by an integer indicating how many digits follow the decimal point in the %f, %e, and %E conversions. For instance, %.4f prints a float with 4 fractional digits.

The integer in a width or precision can also be specified as *, in which case an extra integer argument is taken to specify the corresponding width or precision. This integer argument precedes immediately the argument to print. For instance, %.*f prints a float with as many fractional digits as the value of the argument given before the float.

let printf: Pervasives.format('a, Pervasives.out_channel, unit) => 'a;
Same as Printf.fprintf, but output on stdout.
let eprintf: Pervasives.format('a, Pervasives.out_channel, unit) => 'a;
Same as Printf.fprintf, but output on stderr.
let sprintf: Pervasives.format('a, unit, string) => 'a;
Same as Printf.fprintf, but instead of printing on an output channel, return a string containing the result of formatting the arguments.
let bprintf: (Buffer.t, Pervasives.format('a, Buffer.t, unit)) => 'a;
Same as Printf.fprintf, but instead of printing on an output channel, append the formatted arguments to the given extensible buffer (see module Buffer).
let ifprintf: ('a, Pervasives.format('b, 'a, unit)) => 'b;
Same as Printf.fprintf, but does not print anything. Useful to ignore some material when conditionally printing.
Since 3.10.0

Formatted output functions with continuations.
let kfprintf:
  (
    Pervasives.out_channel => 'a,
    Pervasives.out_channel,
    Pervasives.format4('b, Pervasives.out_channel, unit, 'a)
  ) =>
  'b;
Same as fprintf, but instead of returning immediately, passes the out channel to its first argument at the end of printing.
Since 3.09.0
let ikfprintf:
  (
    Pervasives.out_channel => 'a,
    Pervasives.out_channel,
    Pervasives.format4('b, Pervasives.out_channel, unit, 'a)
  ) =>
  'b;
Same as kfprintf above, but does not print anything. Useful to ignore some material when conditionally printing.
Since 4.0
let ksprintf: (string => 'a, Pervasives.format4('b, unit, string, 'a)) => 'b;
Same as sprintf above, but instead of returning the string, passes it to the first argument.
Since 3.09.0
let kbprintf:
  (Buffer.t => 'a, Buffer.t, Pervasives.format4('b, Buffer.t, unit, 'a)) => 'b;
Same as bprintf, but instead of returning immediately, passes the buffer to its first argument at the end of printing.
Since 3.10.0

Deprecated
let kprintf: (string => 'a, Pervasives.format4('b, unit, string, 'a)) => 'b;
A deprecated synonym for ksprintf.