Decimal computer Decimal computer Decimal computers are computers which can represent numbers and addresses in decimal as well as providing instructions to operate on those numbers and addresses directly in decimal, without conversion to a pure binary representation. Some also had a variable wordlength, which enabled operations on numbers with a large number of digits. Early computers that were exclusively decimal include the ENIAC, IBM NORC, IBM 650, IBM 1620, IBM 7070. In these machines, the basic unit of data was the decimal digit, encoded in one of several schemes, including binary-coded decimal or BCD, bi-quinary, excess-3, and two-out-of-five code. Except for
Decimal representation unique. The number defined by a decimal representation is often written more briefly as That is to say, "a" is the integer part of "r", not necessarily between 0 and 9, and "a", "a", "a", ... are the digits forming the fractional part of "r". Both notations above are, by definition, the following limit of a sequence: Any real number can be approximated to any desired degree of accuracy by rational numbers with finite decimal representations. Assume formula_4. Then for every integer formula_5 there is a finite decimal formula_6 such that Proof: Let formula_8, where formula_9. Then formula_10, and the