Question 1

What is binary (base 2)?

Accepted Answer

Binary is a base-2 number system using only digits 0 and 1. It is the fundamental language of computers — every number, character, and instruction in a computer is ultimately represented as binary bits.

Question 2

What is hexadecimal (base 16)?

Accepted Answer

Hexadecimal (hex) is a base-16 number system using digits 0-9 and letters A-F. It is widely used in programming, color codes (#FF5733), memory addresses, and binary data because each hex digit represents exactly 4 binary bits.

Question 3

How do I convert decimal to binary?

Accepted Answer

To convert decimal to binary, repeatedly divide the number by 2 and record the remainders. Reading remainders from bottom to top gives the binary representation. For example, 255 in decimal equals 11111111 in binary.

Question 4

What is octal (base 8) used for?

Accepted Answer

Octal is a base-8 number system (digits 0-7). It is used in Unix/Linux file permissions (e.g. chmod 755) and some legacy computing contexts. Each octal digit represents exactly 3 binary bits.

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