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Devoted to discussion pertaining to those issues which are specifically relevant to people under 45. Topics must have a specific perspective of people in this age group for it to be on topic.

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Aug 17th 2012 new

(Quote) Patricia-755756 said: I'm 45, so does that mean for 1 year I'm an honored member of both groups?
(Quote) Patricia-755756 said:

I'm 45, so does that mean for 1 year I'm an honored member of both groups?

--hide--

Only if 45 is less than 45. laughing laughing

Aug 17th 2012 new

(Quote) Dawn-58330 said: I believe 29 is still under 45... Yep. Forever 29.
(Quote) Dawn-58330 said: I believe 29 is still under 45... Yep. Forever 29.
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Actually, yau ARE 29. In hexadecimal. Of course, that means on your next birthday you'll be 2A (or not (yet) 2B, if you prefer).

 

Aug 17th 2012 new

(Quote) AnneMarie-641597 said: I'm up in 2. Life's good though. It doesn't phase me until I realize...
(Quote) AnneMarie-641597 said:


I'm up in 2. Life's good though. It doesn't phase me until I realize my daughter appropriately fits in this room, too.

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Shut up! eyepopping No, I mean it, "Shut UP!" irked My 19 year old daughter could be here, too boggled weeping Wasn't it just yesterday she was a little tiny person needing Mommy to tuck her in? sad

That would be so weird if she joined this site boggled laughing

Aug 17th 2012 new

(Quote) AnneMarie-641597 said: because he's a geek. It's basic computer stuff. I took a chapter about ...
(Quote) AnneMarie-641597 said:


because he's a geek. It's basic computer stuff. I took a chapter about it in my CPT102 class. Jerry is just a geek though. We like that about him!

--hide--
Well if I ever decide to return to college, I'll have Jerry on my speed dial!

Aug 17th 2012 new

(Quote) Jerry-74383 said: Long story short, it's the way computer people represent memory addresses and content...
(Quote) Jerry-74383 said:

Long story short, it's the way computer people represent memory addresses and content.

Why? It's shorter than decimal notation and it's directly convertible to/from binary (the internal representation of data in the computer).

The longer explanation:

Computers store data in a format known as binary (two states): 1 or 0. Each unit of storage is known as a bit (BInary digiT). A single bit can represent two states (e.g., True or False) or the numbers 0 or 1; to represent anything more complex, such as larger numbers or a character of data, requires a collection of bits. Humans typically represent numbers in the most compact form possible; for example we normally represent the number 'seven hundred eighty three' as 783, not 00783, although both are equivalent.

For practical reasons, computers used fixed size units of data -- that is, using the same number of bits.For a variety of historical and practical reasons, most modern computers use storage units that are multiples of 8 bits. The basic 8 bit unit is called a byte; larger groups are typically called words, longwords, and quadwords (the length of each unit depends on the specific computer). [Trivia: a 4 bit unit (1/2 byte) is known as a nibble.]

Each bit position in a binary word represents a number that is a power of 2 (e.g. 1(2^0), 2(2^1), 4(2^2), 8(2^3), 16(2^4), etc. Usuang a 4 bit word, the successive numbers from 0 to 15 are: 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001, ... 1111. For example 6 (0110) is 0*8 + 1*4 + 1*2 + 0*1.

Now I can (finally!) answer the question:

Hexadecimal is convenient for representing computer data because each hexadecimal digit can represent 16 values: 0-15 -- *exactly* 4 bits! (0-9 represent0-9 in decimal; A-F represent 10-15, respectively). A byte is represented by two hexadecimal digits; the other common storage units (16, 32 and 64 bits) are represented by 4, 8, and 16 hexadecimal digits respectively. In contrast, 32 and 64 bit quantities require 10 and 20 decimal digits, respectively.

Once one learns the bit patterns associated with each of the 16 values (it doesn't take long for it to become second nature), it is easy to translate between binary and hexadecimal numbers of any length by working 4 bits at a time. For example 7FFEA45C is 0111 1111 1111 1110 1010 0100 0101 1100. The same number in decimal is 2147394652 (certainly more difficult to remember, even to copy down, and far more difficult to convert (I had to use a calculator)). In addition, one can easily recognize patterns of bits in the binary data that are not evident in the decimal representation, which is often very handy when troubleshooting problems. In particular, when looking at the hexadecimal representation of character data, each two hex digits represents one character of data; with some practice it becomes easy to translate between the hex code to the character. The conversions are made easier by the fact that there are certain patterns that are more obvious in the hex representation than in the decimal: for example, the code for 0-9 are 30-39 hex/48-57 decimal; A-Z 41-5A hex/65-90 decimal; a-z 61-7A hex/97-122 decimal.

Does this make any sense?

--hide--

I probably won't remember it tomorrow, but it makes sense right now. I actually learned about bits and bytes about 30 years ago, when I took a computer class at a local college. I never used that information again, though, so I don't know how often I'm going to use hexadecimal numbers scratchchin

Aug 17th 2012 new

Sorry, Um...my 25 year old daughter IS on the secular site with me. Talk about SUPER odd! heart

Aug 17th 2012 new

(Quote) AnneMarie-641597 said: Sorry, Um...my 25 year old daughter IS on the secular site with me. Talk about SUPER odd!...
(Quote) AnneMarie-641597 said:

Sorry, Um...my 25 year old daughter IS on the secular site with me. Talk about SUPER odd!

--hide--

Wow... faint . I like CM without my daughter, but I guess if she wasn't dating someone and wanted to join... I'd be happy that she was looking for a Catholic husband. But since she's not, I'm glad to have the site to myself wink

Aug 17th 2012 new
Here!
Aug 17th 2012 new

(Quote) Tom-432657 said: Where's all the 45 and under people?
(Quote) Tom-432657 said: Where's all the 45 and under people?
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Over here. biggrin

Aug 17th 2012 new

yes. I'm one too rolling eyes wave

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