BCD Codes


Character Codes - Concepts
Class - Bank PO Prelims Subjects
 
 
Concept Explanation
 

BCD Codes

Binary Coded Decimal(BCD)

Is one of the early Computer Codes.The Idea of this coding schema is to convert each digit of a decimal number into its binary equivalent instead of converting the entire decimal value into a binary number.This makes the Conversion process easier.

Following table illustrate coding of alphabetic and numeric characters in BCD:

Character

              BCD CODE

Octal Equivalent

Zone

Digit

A 11 0001 61
B 11 0010 62
C 11 0011 63
D 11 0100 64
E 11 0101 65
F 11 0110 66
G 11 0111 67
H 11 1000 70
I 11 1001 71
J 10 0001 41
K 10 0010 42
L 10 0011 43
M 10 0100 44
N 10 0101 45
O 10 0110 46
P 10 0111 47
Q 10 1000 50
R 10 1001 51
S 01 0010 22

Since in BCD 8 and 9 require 4 bits, all decimal digits are represented in BCD by 4 bits.

While converting Decimal to Binary Equivalent we saw that 4210 is equal to 1010102.

Converting Decimal in BCD code

Converting 4210 into BCD:

4210=

The code for 4 and 2 is

         0100=4

         0010=2

Hence 4210 in BCD equivalent to 01000010.

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Sample Questions
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Question : 1

BCD is _______________________

Right Option : A
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Explanation
 
 


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