This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.

# FromDigits

 FromDigits[list]constructs an integer from the list of its decimal digits. FromDigits[list, b]takes the digits to be given in base b. FromDigits["string"]constructs an integer from a string of digits. FromDigits["string", "Roman"]constructs an integer from Roman numerals.
• Since discards the sign of n, is Abs[n] not just n.  »
• The digits in list and the base b need not be positive integers, and can be any expression.  »
• If Indeterminate appears in list, it is assumed to signify unknown digits beyond the precision of an approximate real number.  »
• FromDigits["string", b] takes the digits in "string" to be given in base b.
• In FromDigits["string", b], digits above 9 can be represented by letters a-z or A-Z.
Construct a number from its base-10 digits:
Base-2 digits:
Construct a number from its base-10 digits:
 Out[1]=

Base-2 digits:
 Out[1]=
 Scope   (3)
Use symbolic digits and base:
Digits larger than the base are "carried":
Reconstruct a rational number from recurring digits:
Construct a number with limited precision:
 Applications   (3)
Find the number with recurring digits 123:
Find numbers with successive recurring binary digit sequences:
IntegerDigits drops the sign: