Short for Binary Coded Decimal,

**BCD**is also known as packet decimal and is numbers 0 through 9 converted to four-digit binary. Using this conversion, the number 25, for**example**, would have a**BCD**number of 0010 0101 or 00100101. However, in binary, 25 is represented as 11001.In respect to this, why BCD code is used?

In computing and electronic systems, binary-coded decimal (

**BCD**) is a 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 (e.g., error or overflow).What do you mean by BCD?

Binary coded decimal (

**BCD**) is a system of writing numerals that assigns a four-digit binary**code**to each digit 0 through 9 in a decimal (base-10) numeral. The four-bit**BCD code**for any particular single base-10 digit is its representation in binary notation, as follows: 0 = 0000. 1 = 0001. 2 = 0010.What is meant by packed BCD?

**Packed BCD**means that each byte contains two

**BCD**digits, one digit in the upper nibble and the other digit in the lower nibble. For example, the number 74 would be expressed by the single byte 0x74. Unpacked

**BCD**would only have one

**BCD**digit per byte. ( Or more generally, one digit per CPU word.)