19.12 Module Int32: 32-bit integers

This module provides operations on the type int32 of signed 32-bit integers. Unlike the built-in int type, the type int32 is guaranteed to be exactly 32-bit wide on all platforms. All arithmetic operations over int32 are taken modulo 232.

Performance notice: values of type int32 occupy more memory space than values of type int, and arithmetic operations on int32 are generally slower than those on int. Use int32 only when the application requires exact 32-bit arithmetic.
val zero : int32
val one : int32
val minus_one : int32
The 32-bit integers 0, 1, -1.
val neg : int32 -> int32
Unary negation.
val add : int32 -> int32 -> int32
val sub : int32 -> int32 -> int32
val mul : int32 -> int32 -> int32
val div : int32 -> int32 -> int32
Integer division. Raise Division_by_zero if the second argument is zero.
val rem : int32 -> int32 -> int32
Integer remainder. If x >= 0 and y > 0, the result of Int32.rem x y satisfies the following properties: 0 <= Int32.rem x y < y and x = Int32.add (Int32.mul (Int32.div x y) y) (Int32.rem x y). If y = 0, Int32.rem x y raises Division_by_zero. If x < 0 or y < 0, the result of Int32.rem x y is not specified and depends on the platform.
val succ : int32 -> int32
Successor. Int32.succ x is Int32.add x Int32.one.
val pred : int32 -> int32
Predecessor. Int32.pred x is Int32.sub x Int32.one.
val abs : int32 -> int32
Return the absolute value of its argument.
val max_int : int32
The greatest representable 32-bit integer, 231 - 1.
val min_int : int32
The smallest representable 32-bit integer, -231.
val logand : int32 -> int32 -> int32
Bitwise logical and.
val logor : int32 -> int32 -> int32
Bitwise logical or.
val logxor : int32 -> int32 -> int32
Bitwise logical exclusive or.
val lognot : int32 -> int32
Bitwise logical negation
val shift_left : int32 -> int -> int32
Int32.shift_left x y shifts x to the left by y bits. The result is unspecified if y < 0 or y >= 32.
val shift_right : int32 -> int -> int32
Int32.shift_right x y shifts x to the right by y bits. This is an arithmetic shift: the sign bit of x is replicated and inserted in the vacated bits. The result is unspecified if y < 0 or y >= 32.
val shift_right_logical : int32 -> int -> int32
Int32.shift_right_logical x y shifts x to the right by y bits. This is a logical shift: zeroes are inserted in the vacated bits regardless of the sign of x. The result is unspecified if y < 0 or y >= 32.
val of_int : int -> int32
Convert the given integer (type int) to a 32-bit integer (type int32).
val to_int : int32 -> int
Convert the given 32-bit integer (type int32) to an integer (type int). On 32-bit platforms, the 32-bit integer is taken modulo 231, i.e. the high-order bit is lost during the conversion. On 64-bit platforms, the conversion is exact.
val of_float : float -> int32
Convert the given floating-point number to a 32-bit integer, discarding the fractional part (truncate towards 0). The result of the conversion is undefined if, after truncation, the number is outside the range Int32.min_int, Int32.max_int.
val to_float : int32 -> float
Convert the given 32-bit integer to a floating-point number.
val of_string : string -> int32
Convert the given string to a 32-bit integer. The string is read in decimal (by default) or in hexadecimal, octal or binary if the string begins with 0x, 0o or 0b respectively. Raise Failure "int_of_string" if the given string is not a valid representation of an integer.
val to_string : int32 -> string
Return the string representation of its argument, in signed decimal.
val format : string -> int32 -> string
Int32.format fmt n return the string representation of the 32-bit integer n in the format specified by fmt. fmt is a Printf-style format containing exactly one 0, 0, 0, 0, 0 or 0 conversion specification. See the documentation of the Printf module for more information,