Question 1

What is BCD?

Accepted Answer

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.

Question 2

Why is BCD used?

Accepted Answer

BCD is used in financial applications and embedded systems where exact decimal representation is important, avoiding floating-point rounding errors.

Question 3

What is the difference between packed and unpacked BCD?

Accepted Answer

In packed BCD, two decimal digits are stored in one byte (4 bits each). In unpacked BCD, each decimal digit occupies one full byte. Packed BCD is more space-efficient.

Question 4

Where is BCD commonly used?

Accepted Answer

BCD is widely used in financial systems, calculators, digital clocks, and any application where decimal precision is critical. Payment terminals and ATMs often use BCD for amount representation.

Binary Coded Decimal (BCD)

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