Question 1

What is BCD (Binary-Coded Decimal)?

Accepted Answer

Each decimal digit encoded separately as 4-bit binary. 42 = 0100 0010 in BCD vs 101010 in pure binary.

Question 2

Why use BCD instead of binary?

Accepted Answer

Easier decimal display, no rounding errors for exact decimal values. Used in calculators and financial systems.

Question 3

Why do computers use binary?

Accepted Answer

Electronic circuits have two states: on/off, high/low voltage. Binary (0 and 1) maps directly to these states, making digital logic simpler and more reliable.

Question 4

Why is hexadecimal used in programming?

Accepted Answer

Hex is compact: each digit represents 4 binary bits. A byte (8 bits) is exactly 2 hex digits (00-FF), making memory addresses and color codes readable.

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