Question 1

How do I convert hex to decimal manually?

Accepted Answer

To convert hex to decimal, multiply each digit by 16 raised to its position power. Hex digits A–F equal 10–15. For example, 0x1F = (1×16¹) + (15×16⁰) = 16 + 15 = 31. For 0xFF = (15×16) + (15×1) = 240 + 15 = 255.

Question 2

What digits does hexadecimal use?

Accepted Answer

Hexadecimal (base 16) uses 16 symbols: 0–9 for values zero through nine, and A, B, C, D, E, F for values ten through fifteen. This means A = 10, B = 11, C = 12, D = 13, E = 14, F = 15. Hex is case-insensitive: 0xFF and 0xff are the same value.

Question 3

Why do programmers use hexadecimal?

Accepted Answer

Programmers use hex because each hex digit maps exactly to 4 binary bits, making it a compact human-readable representation of binary data. Instead of writing 11111111 in binary, you write FF. Memory addresses, color codes (#RRGGBB), and byte values are all commonly expressed in hex.

Question 4

What is 0xFF in decimal?

Accepted Answer

0xFF in hexadecimal equals 255 in decimal. It is the maximum value of a single byte (8 bits). In web colors, #FFFFFF means each of R, G, B equals 255 — producing pure white. In binary, 0xFF is 11111111.

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