Question 1

How do you convert octal to decimal?

Accepted Answer

Multiply each digit by power of 8. 755 = 7×64 + 5×8 + 5 = 493 decimal.

Question 2

What does chmod 755 mean?

Accepted Answer

Octal file permissions: 7 (rwx owner) + 5 (rx group) + 5 (rx others). Each digit is 3 permission bits.

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.

Octal to Decimal Number Converter - Free Online Tool

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