packed decimal - Definition. Was ist packed decimal
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Was (wer) ist packed decimal - definition

CLASS OF BINARY ENCODINGS OF DECIMAL NUMBERS WHERE EACH DECIMAL DIGIT IS REPRESENTED BY A FIXED NUMBER OF BITS, USUALLY FOUR OR EIGHT. SPECIAL BIT PATTERNS ARE SOMETIMES USED FOR A SIGN OR FOR OTHER INDICATIONS
Binary Coded Decimal; Binary coded decimal; Packed decimal; Binary-coded decimal notation; Binary-Coded Decimal; BCD code; Zoned decimal; Nbcd; NBCD; Bcd number; Packed BCD; Unpacked BCD; BCD4; Packed binary-coded decimal; Pseudo-tetrade; Pseudo tetrade; Pseudo-tetrades; Pseudo tetrades; Pseudo tetrad; Pseudo-tetrad; Pseudotetrad; Pseudotetrade; Pseudo tetrads; Pseudo-tetrads; Pseudotetrads; TBCD (computing); TBCD (telecommunications); Unpacked binary-coded decimal; Pseudo-decimal digit; Pseudo combination (computing); Pseudo decimal digit; Zoned BCD; Zoned binary-coded decimal; 8-4-2-1 code; 8-4-2-1 (code); 8-4-2-1 BCD; BCD 8-4-2-1; 8421 BCD; BCD 8421; 8-4-2-1 BCD code; BCD arithmetic; Natural BCD; 8 4 2 1 code; 8421 code; Pseudo-decimal; Pseudo-decimals; Pseudodecimals; Pseudodecimal; Pseudo decimals; Pseudo decimal; Conventional binary coded decimal; Conventional BCD; Conventional binary-coded decimal; Natural binary coded decimal; Natural binary-coded decimal; Excess-0; Excess-0 code; XS-0; XS-0 code; Compressed BCD; Compressed binary-coded decimal; Packed Decimal; 8421 BCD code; 8 4 2 1 BCD; 8 4 2 1 BCD code; Jump-at-8 code; Jump-at-8; Jump-at-2 code; Jump-at-2; White code; White BCD code; 4-2-2-1 BCD code; 4-2-2-1 code; 4221 BCD code; 4221 code; 4 2 2 1 BCD code; 4 2 2 1 code; 5421 code; 5421 BCD code; 5-4-2-1 code; 5-4-2-1 BCD code; 5 4 2 1 code; 5 4 2 1 BCD code; 5-2-2-1 BCD code; 5 2 2 1 code; 5-2-2-1 code; 5221 BCD code; 5 2 2 1 BCD code; 5221 code; 5311 code; 5311 BCD code; 5-3-1-1 code; 5-3-1-1 BCD code; 5 3 1 1 code; 5 3 1 1 BCD code; BCD notation; LARC code; LARC BCD code; LARC BCD; BCD LARC; UNIVAC LARC code; UNIVAC LARC BCD code; UNIVAC LARC BCD; Pure binary coded decimal; Pure binary-coded decimal; Natural Binary Coded Decimal; Pure Binary Coded Decimal; Pure BCD; Natural BCD code; Pure BCD code; XS-0 BCD; Excess-0 BCD; 7-4-2-1 BCD; Pseudo-pentade; Pseudo-pentades; Pseudo pentade; Pseudopentade; Pseudo pentades; Pseudopentades; Pseudodigit; Pseudo-digit; Pseudo digit; BCD integer; Ferranti code; Decimal-coded binary code; Decimal-coded binary; Decimal-coded Binary Code; 5-421 code; 5-421
  • LED]]s to express binary values. In this clock, each column of LEDs shows a binary-coded decimal numeral of the traditional [[sexagesimal]] time.

packed decimal         
decimal point         
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  • via=scan published by [[Harvard-Smithsonian Center for Astrophysics]] }}</ref>
  • California milepost marker at mile 144.44
  • Three ways to group the number ten thousand with digit group separators.<br/>1) Space, the internationally recommended thousands separator.<br/>2) Period (or full stop), the thousands separator used in many non-English speaking countries.<br/>3) Comma, the thousands separator used in most English-speaking countries.
SYMBOL USED TO SEPARATE THE INTEGER PART FROM THE FRACTIONAL PART OF A NUMBER WRITTEN IN BASE 10
Radix point; Decimal comma; Decimal point; ٫; Binary point; Momayyez; Decimal dot; Thousands separator; Digit group separator; Decimal period; Thousands' separator; Decimal divider; Digit grouping; Radix character; ⎖; Radix mark; Radix separator; ٬; Decimal separator key; Decimal sign; Thousands-separator; Upper comma; Decimal form; Decimal marker; Monetary decimal separator; Numeric decimal separator; Version decimal separator; Decimal version separator; Pythagorean arc; Separatrix (decimal mark); Decimal marks; Decimal separators; Decimal mark; Thousands divider; Thousand divider; Thousand separator; Thousands period; Thousands comma; Thousands marker; Decimal separation
<character> "." ASCII character 46. Common names are: point; dot; ITU-T, USA: period; ITU-T: decimal point. Rare: radix point; UK: full stop; INTERCAL: spot. (1995-03-14)
Decimal separator         
  • Data unavailable}}
  • via=scan published by [[Harvard-Smithsonian Center for Astrophysics]] }}</ref>
  • California milepost marker at mile 144.44
  • Three ways to group the number ten thousand with digit group separators.<br/>1) Space, the internationally recommended thousands separator.<br/>2) Period (or full stop), the thousands separator used in many non-English speaking countries.<br/>3) Comma, the thousands separator used in most English-speaking countries.
SYMBOL USED TO SEPARATE THE INTEGER PART FROM THE FRACTIONAL PART OF A NUMBER WRITTEN IN BASE 10
Radix point; Decimal comma; Decimal point; ٫; Binary point; Momayyez; Decimal dot; Thousands separator; Digit group separator; Decimal period; Thousands' separator; Decimal divider; Digit grouping; Radix character; ⎖; Radix mark; Radix separator; ٬; Decimal separator key; Decimal sign; Thousands-separator; Upper comma; Decimal form; Decimal marker; Monetary decimal separator; Numeric decimal separator; Version decimal separator; Decimal version separator; Pythagorean arc; Separatrix (decimal mark); Decimal marks; Decimal separators; Decimal mark; Thousands divider; Thousand divider; Thousand separator; Thousands period; Thousands comma; Thousands marker; Decimal separation
A decimal separator is a symbol used to separate the integer part from the fractional part of a number written in decimal form (e.g.

Wikipedia

Binary-coded decimal

In computing and electronic systems, binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each digit is represented by a fixed number of bits, usually four or eight. Sometimes, special bit patterns are used for a sign or other indications (e.g. error or overflow).

In byte-oriented systems (i.e. most modern computers), the term unpacked BCD usually implies a full byte for each digit (often including a sign), whereas packed BCD typically encodes two digits within a single byte by taking advantage of the fact that four bits are enough to represent the range 0 to 9. The precise 4-bit encoding, however, may vary for technical reasons (e.g. Excess-3).

The ten states representing a BCD digit are sometimes called tetrades (for the nibble typically needed to hold them is also known as a tetrade) while the unused, don't care-states are named pseudo-tetrad(e)s, pseudo-decimals or pseudo-decimal digits.

BCD's main virtue, in comparison to binary positional systems, is its more accurate representation and rounding of decimal quantities, as well as its ease of conversion into conventional human-readable representations. Its principal drawbacks are a slight increase in the complexity of the circuits needed to implement basic arithmetic as well as slightly less dense storage.

BCD was used in many early decimal computers, and is implemented in the instruction set of machines such as the IBM System/360 series and its descendants, Digital Equipment Corporation's VAX, the Burroughs B1700, and the Motorola 68000-series processors. BCD per se is not as widely used as in the past, and is unavailable or limited in newer instruction sets (e.g., ARM; x86 in long mode). However, decimal fixed-point and decimal floating-point formats are still important and continue to be used in financial, commercial, and industrial computing, where the subtle conversion and fractional rounding errors that are inherent in binary floating point formats cannot be tolerated.