Question 1

What is two's complement?

Accepted Answer

Standard for signed integers. Invert bits and add 1. -5 in 8-bit: 00000101 → 11111010 → 11111011.

Question 2

Why is two's complement used?

Accepted Answer

Only one zero, simpler addition circuit. Most computers use two's complement for signed integers.

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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