 # Quick Answer: What Is BCD Number?

## Why BCD adder is used?

A BCD 1-digit adder is a circuit that adds two BCD digits in parallel and also produces the Sum digit in BCD along with the necessary correction logic.

It can be seen that a 4-bit binary adder is used initially to add two BCD digits (each digit expressed using 4 bits) with a carry-input..

Because each hexadecimal digit has 16 different values and BCD has only 10. … Similarly, in BCD math, when the result of the addition is larger than 9 you add 6 to skip the 6 remaining “invalid” values and carry to the next digit.

## What is meant by BCD number?

In the BCD numbering system, a decimal number is separated into four bits for each decimal digit within the number. Each decimal digit is represented by its weighted binary value performing a direct translation of the number.

## Why BCD is called 8421 code?

The BCD8421 code is so called because each of the four bits is given a ‘weighting’ according to its column value in the binary system. The least significant bit (lsb) has the weight or value 1, the next bit, going left, the value 2.

## Where is BCD used?

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.

## What is the use of BCD code?

Binary-coded Decimal or BCD is a way of representing a decimal number as a string of bits suitable for use in electronic systems. Rather than converting the whole number into binary, BCD splits the number up into its digits and converts each digit to 4-bit binary.

## What is 2421 BCD code?

The Aiken code (also known as 2421 code) is a complementary binary-coded decimal (BCD) code. A group of four bits is assigned to the decimal digits from 0 to 9 according to the following table.

## How do I convert to BCD code?

Binary to BCD ConversionStep 1 − Convert to Decimal. Binary Number − 111012 Calculating Decimal Equivalent − Step. Binary Number. Decimal Number. 111012 … Step 2 − Convert to BCD. Decimal Number − 2910 Calculating BCD Equivalent. Convert each digit into groups of four binary digits equivalent. Step. Decimal Number. Conversion.

## Is BCD a self complementing code?

2 4 2 1 code So, it is a positively weighted code. … Sum of weights of unnatural BCD codes is equal to 9. It is a self-complementing code. Self-complementing codes provide the 9’s complement of a decimal number, just by interchanging 1’s and 0’s in its equivalent 2421 representation.

## Is Gray code a BCD code?

As per the above expression all the decimal numbers written in the 4 Bit binary code in the form of 8421 and this is called as 8421 Code and also as Binary coded decimal BCD. … They are 2421 code, 5211 code, reflective code, sequential code, non- weighted coded, excess-3 code and Grey code.

## How many don’t care inputs are there in BCD adder?

312Q1. how many dont care inputs are there in a. BCD ADDER? dont care conditions are 312.