# FixedWidthInteger Implementations ## Topics ### Operators [`static func &* (Self, Self) -> Self`](/documentation/Swift/UInt128/&*(_:_:)) Returns the product of the two given values, wrapping the result in case of any overflow. [`static func &*= (inout Self, Self)`](/documentation/Swift/UInt128/&*=(_:_:)) Multiplies two values and stores the result in the left-hand-side variable, wrapping any overflow. [`static func &+ (Self, Self) -> Self`](/documentation/Swift/UInt128/&+(_:_:)) Returns the sum of the two given values, wrapping the result in case of any overflow. [`static func &+= (inout Self, Self)`](/documentation/Swift/UInt128/&+=(_:_:)) Adds two values and stores the result in the left-hand-side variable, wrapping any overflow. [`static func &- (Self, Self) -> Self`](/documentation/Swift/UInt128/&-(_:_:)) Returns the difference of the two given values, wrapping the result in case of any overflow. [`static func &-= (inout Self, Self)`](/documentation/Swift/UInt128/&-=(_:_:)) Subtracts the second value from the first and stores the difference in the left-hand-side variable, wrapping any overflow. [`static func &<< (Self, Other) -> Self`](/documentation/Swift/UInt128/&__(_:_:)-6im7h) Returns the result of shifting a value’s binary representation the specified number of digits to the left, masking the shift amount to the type’s bit width. [`static func &<< (Self, Self) -> Self`](/documentation/Swift/UInt128/&__(_:_:)-6vbmo) Returns the result of shifting a value’s binary representation the specified number of digits to the left, masking the shift amount to the type’s bit width. [`static func &>> (Self, Other) -> Self`](/documentation/Swift/UInt128/&__(_:_:)-7vshb) Returns the result of shifting a value’s binary representation the specified number of digits to the right, masking the shift amount to the type’s bit width. [`static func &>> (Self, Self) -> Self`](/documentation/Swift/UInt128/&__(_:_:)-t1dt) Returns the result of shifting a value’s binary representation the specified number of digits to the right, masking the shift amount to the type’s bit width. [`static func &>>= (inout UInt128, UInt128)`](/documentation/Swift/UInt128/&__=(_:_:)-2trlh) Calculates the result of shifting a value’s binary representation the specified number of digits to the right, masking the shift amount to the type’s bit width, and stores the result in the left-hand-side variable. [`static func &>>= (inout Self, Other)`](/documentation/Swift/UInt128/&__=(_:_:)-7h6z1) Calculates the result of shifting a value’s binary representation the specified number of digits to the right, masking the shift amount to the type’s bit width, and stores the result in the left-hand-side variable. [`static func &<<= (inout Self, Other)`](/documentation/Swift/UInt128/&__=(_:_:)-c0o3) Returns the result of shifting a value’s binary representation the specified number of digits to the left, masking the shift amount to the type’s bit width, and stores the result in the left-hand-side variable. [`static func &<<= (inout UInt128, UInt128)`](/documentation/Swift/UInt128/&__=(_:_:)-l1y8) Returns the result of shifting a value’s binary representation the specified number of digits to the left, masking the shift amount to the type’s bit width, and stores the result in the left-hand-side variable. ### Initializers [`init(T)`](/documentation/Swift/UInt128/init(_:)-7l4pg) [`init?(String)`](/documentation/Swift/UInt128/init(_:)-7reec) Creates a new integer value from the given string. [`init?(S, radix: Int)`](/documentation/Swift/UInt128/init(_:radix:)) Creates a new integer value from the given string and radix. [`init(bigEndian: Self)`](/documentation/Swift/UInt128/init(bigEndian:)) Creates an integer from its big-endian representation, changing the byte order if necessary. [`init?(exactly: T)`](/documentation/Swift/UInt128/init(exactly:)-4u158) [`init(littleEndian: Self)`](/documentation/Swift/UInt128/init(littleEndian:)) Creates an integer from its little-endian representation, changing the byte order if necessary. ### Instance Properties [`var bigEndian: Self`](/documentation/Swift/UInt128/bigEndian) The big-endian representation of this integer. [`var byteSwapped: UInt128`](/documentation/Swift/UInt128/byteSwapped) A representation of this integer with the byte order swapped. [`var leadingZeroBitCount: Int`](/documentation/Swift/UInt128/leadingZeroBitCount) The number of leading zeros in this value’s binary representation. [`var littleEndian: Self`](/documentation/Swift/UInt128/littleEndian) The little-endian representation of this integer. [`var nonzeroBitCount: Int`](/documentation/Swift/UInt128/nonzeroBitCount) The number of bits equal to 1 in this value’s binary representation. ### Instance Methods [`func addingReportingOverflow(UInt128) -> (partialValue: UInt128, overflow: Bool)`](/documentation/Swift/UInt128/addingReportingOverflow(_:)) Returns the sum of this value and the given value, along with a Boolean value indicating whether overflow occurred in the operation. [`func dividedReportingOverflow(by: UInt128) -> (partialValue: UInt128, overflow: Bool)`](/documentation/Swift/UInt128/dividedReportingOverflow(by:)) Returns the quotient obtained by dividing this value by the given value, along with a Boolean value indicating whether overflow occurred in the operation. [`func multipliedFullWidth(by: Self) -> (high: Self, low: Self.Magnitude)`](/documentation/Swift/UInt128/multipliedFullWidth(by:)) Returns a tuple containing the high and low parts of the result of multiplying this value by the given value. [`func multipliedReportingOverflow(by: UInt128) -> (partialValue: UInt128, overflow: Bool)`](/documentation/Swift/UInt128/multipliedReportingOverflow(by:)) Returns the product of this value and the given value, along with a Boolean value indicating whether overflow occurred in the operation. [`func remainderReportingOverflow(dividingBy: UInt128) -> (partialValue: UInt128, overflow: Bool)`](/documentation/Swift/UInt128/remainderReportingOverflow(dividingBy:)) Returns the remainder after dividing this value by the given value, along with a Boolean value indicating whether overflow occurred during division. [`func subtractingReportingOverflow(UInt128) -> (partialValue: UInt128, overflow: Bool)`](/documentation/Swift/UInt128/subtractingReportingOverflow(_:)) Returns the difference obtained by subtracting the given value from this value, along with a Boolean value indicating whether overflow occurred in the operation. ### Type Properties [`static var bitWidth: Int`](/documentation/Swift/UInt128/bitWidth) The number of bits used for the underlying binary representation of values of this type. [`static var max: UInt128`](/documentation/Swift/UInt128/max) The maximum representable integer in this type. [`static var min: UInt128`](/documentation/Swift/UInt128/min) The minimum representable integer in this type. ### Type Methods [`static func random(in: ClosedRange) -> Self`](/documentation/Swift/UInt128/random(in:)-1tk4g) Returns a random value within the specified range. [`static func random(in: Range) -> Self`](/documentation/Swift/UInt128/random(in:)-6h05w) Returns a random value within the specified range. [`static func random(in: Range, using: inout T) -> Self`](/documentation/Swift/UInt128/random(in:using:)-1acx9) Returns a random value within the specified range, using the given generator as a source for randomness. [`static func random(in: ClosedRange, using: inout T) -> Self`](/documentation/Swift/UInt128/random(in:using:)-535e1) Returns a random value within the specified range, using the given generator as a source for randomness. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)