Module Big_int

module Big_int: sig .. end

Operations on arbitrary-precision integers.

Big integers (type big_int) are signed integers of arbitrary size.

type big_int

The type of big integers.

val zero_big_int : big_int

The big integer 0.

val unit_big_int : big_int

The big integer 1.

Arithmetic operations

val minus_big_int : big_int -> big_int

Unary negation.

val abs_big_int : big_int -> big_int

Absolute value.

val add_big_int : big_int -> big_int -> big_int

Addition.

val succ_big_int : big_int -> big_int

Successor (add 1).

val add_int_big_int : int -> big_int -> big_int

Addition of a small integer to a big integer.

val sub_big_int : big_int -> big_int -> big_int

Subtraction.

val pred_big_int : big_int -> big_int

Predecessor (subtract 1).

val mult_big_int : big_int -> big_int -> big_int

Multiplication of two big integers.

val mult_int_big_int : int -> big_int -> big_int

Multiplication of a big integer by a small integer

val square_big_int : big_int -> big_int

Return the square of the given big integer

val sqrt_big_int : big_int -> big_int

sqrt_big_int a returns the integer square root of a, that is, the largest big integer r such that r * r <= a. Raise Invalid_argument if a is negative.

val quomod_big_int : big_int -> big_int -> big_int * big_int

Euclidean division of two big integers. The first part of the result is the quotient, the second part is the remainder. Writing (q,r) = quomod_big_int a b, we have a = q * b + r and 0 <= r < |b|. Raise Division_by_zero if the divisor is zero.

val div_big_int : big_int -> big_int -> big_int

Euclidean quotient of two big integers. This is the first result q of quomod_big_int (see above).

val mod_big_int : big_int -> big_int -> big_int

Euclidean modulus of two big integers. This is the second result r of quomod_big_int (see above).

val gcd_big_int : big_int -> big_int -> big_int

Greatest common divisor of two big integers.

val power_int_positive_int : int -> int -> big_int

val power_big_int_positive_int : big_int -> int -> big_int

val power_int_positive_big_int : int -> big_int -> big_int

val power_big_int_positive_big_int : big_int -> big_int -> big_int

Exponentiation functions. Return the big integer representing the first argument a raised to the power b (the second argument). Depending on the function, a and b can be either small integers or big integers. Raise Invalid_argument if b is negative.

Comparisons and tests

val sign_big_int : big_int -> int

Return 0 if the given big integer is zero, 1 if it is positive, and -1 if it is negative.

val compare_big_int : big_int -> big_int -> int

compare_big_int a b returns 0 if a and b are equal, 1 if a is greater than b, and -1 if a is smaller than b.

val eq_big_int : big_int -> big_int -> bool

val le_big_int : big_int -> big_int -> bool

val ge_big_int : big_int -> big_int -> bool

val lt_big_int : big_int -> big_int -> bool

val gt_big_int : big_int -> big_int -> bool

Usual boolean comparisons between two big integers.

val max_big_int : big_int -> big_int -> big_int

Return the greater of its two arguments.

val min_big_int : big_int -> big_int -> big_int

Return the smaller of its two arguments.

val num_digits_big_int : big_int -> int

Return the number of machine words used to store the given big integer.

Conversions to and from strings

val string_of_big_int : big_int -> string

Return the string representation of the given big integer, in decimal (base 10).

val big_int_of_string : string -> big_int

Convert a string to a big integer, in decimal. The string consists of an optional - or + sign, followed by one or several decimal digits.

Conversions to and from other numerical types

val big_int_of_int : int -> big_int

Convert a small integer to a big integer.

val is_int_big_int : big_int -> bool

Test whether the given big integer is small enough to be representable as a small integer (type int) without loss of precision. On a 32-bit platform, is_int_big_int a returns true if and only if a is between 2³⁰ and 2³⁰-1. On a 64-bit platform, is_int_big_int a returns true if and only if a is between -2⁶² and 2⁶²-1.

val int_of_big_int : big_int -> int

Convert a big integer to a small integer (type int). Raises Failure "int_of_big_int" if the big integer is not representable as a small integer.

val float_of_big_int : big_int -> float

Returns a floating-point number approximating the given big integer.

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