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RealDigits (modified)IntegerPart

FromDigits

FilledSmallSquareFromDigits[list] constructs an integer from the list of its decimal digits.

FilledSmallSquareFromDigits[list, b] takes the digits to be given in base b.

FilledSmallSquare Example: FromDigits[3,7,4] LongRightArrow.

FilledSmallSquareFromDigits is effectively the inverse of IntegerDigits.

FilledSmallSquareFromDigits[list, n, b] takes n to be an exponent, while FromDigits[list, rep, n, b] takes rep to be repeated, so that FromDigits can also be used as the inverse of RealDigits.

FilledSmallSquare Since IntegerDigits[n] discards the sign of n, FromDigits[IntegerDigits[n]] is Abs[n] not just n.

FilledSmallSquare The digits in list and the base b need not be positive integers, and can be any expression.

FilledSmallSquare If Indeterminate appears in list, it is assumed to signify unknown digits beyond the precision of an approximate real number.

FilledSmallSquare See The Mathematica Book: Section 3.1.3.

FilledSmallSquare See also: IntegerDigits, RealDigits, FromContinuedFraction, NumberForm, DigitCount.

RealDigits (modified)IntegerPart