It is an abbreviation of Binary coded decimal. In this coding each decimal digit is represented by the equivalent 4 bits. So if we are to represent 1110 in binary it is 1011 while in BCD it is 0001 0001. So we can see corresponding binary & BCD equivalent of decimal numbers in the following table:
Decimal Binary BCD
0 0000 0000
- 0001 0001
- 0010 0010
- 0011 0011
- 0100 0100
- 0101 0101
- 0110 0110
- 0111 0111
- 1000 1000
- 1001 1001
- 1010 0001 0000
- 1011 0001 0001
- 1100 0001 0010
- 1101 0001 0011
- 1110 0001 0100
- 1111 0001 0101
So we see that in BCD we have only 0000-1001 valid combination of 4 bits while 1010-1111 are invalid.
Comparison of Binary and BCD:
- BCD is lesser efficient than Binary as it takes 8 bits to represent 10 while inbinary it takes only 4 bits
- While BCD to decimal conversion is simpler
- BCD arithmetic is complicated
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