Why use hex values instead of normal base 10 numbers?

Question

I was looking over this code to calculate math.sqrt in Java. I was just wondering why they used hex values in some of the loops and as normal values for variables. What benefits are there to use hex?

Thanks for your help.

Answer 1

They probably used hex values because the numbers are easier to remember in hex. For example, 0x7fffffff is the same as 2147483647, but is a lot easier to remember.

Answer 2

Because hex corresponds much more closely to bits that decimal numbers. Each hex digit corresponds to 4 bits (a nibble). So, once you've learned the bitmask associated with each hex digit (0-F), you can do something like "I want a mask for the low order byte":

0xff

or, "I want a mask for the bottom 31 bits":

0x7fffffff

Just for reference:

HEX    BIN
0   -> 0000
1   -> 0001
2   -> 0010
3   -> 0011
4   -> 0100
5   -> 0101
6   -> 0110
7   -> 0111
8   -> 1000
9   -> 1001
A   -> 1010
B   -> 1011
C   -> 1100
D   -> 1101
E   -> 1110
F   -> 1111

Answer 3

You can represent very large numbers very concisely with hex values since you can fit 6 more values in each digit.

I personally like to use hex when I'm dealing with colors, since I'm used to hex-color-codes from CSS. Example: new Color(0xee, 0xff, 0xee), which would be equivalent to the HTML color-code #eeffee and is much more readable to me than new Color(238, 255, 238).

Answer 4

Hex is a human readable form of the binary the CPU actually uses. When looking at low level commands it often makes more sense to match the CPU and think in hex,