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Topic: Base prefix notation (Read 2 times) previous topic - next topic

Sembazuru


Though why anyone would consider expressing a literal of more than four bits in binary is beyond me.


I've seen (and used) occasions where on a single byte the placement of the high bits is more important than the value. Particularly bit-masking for flags, it's easier (for me) to see the 6th, 4th, 2nd and 1st bits are high (counting 1-8 starting with LSb on the right) on 0b00101101 instead of 0x2D or 45 (let alone 055 (yes, I can learn)).

odometer


(Side note about the "beings with 10 fingers" comment... Back when I used to wait tables I developed a finger counting method that, while is actually base 5 (1,2,3,4,10,11,12,13,14,20, etc...), I called "groups of 5" that I used for counting number of chairs or people in a room. Quickly move my fingers behind my back, and then when back in the safety of the waiter's station or kitchen count 25 for the left thumb, 5 for each left finger, and 1 for each right digit. To the customers it just looks like I'm standing there looking over the room with my hands behind my back. My short-term memory for numbers is so short, I needed to keep track on my fingers so I didn't loose count if someone asked me where the bathroom is... So much for base 10 being default...) ;)


There actually is a combination base-5 / base-10 method called "chisanbop".

Right fingers (except for thumb) = 1 unit per finger
Right thumb = 5 units
Left fingers (except for thumb) = 10 units per finger
Left thumb = 50 units

And as for losing track of numbers, I too am very distractable. Only for me it's not limited to numbers.
I wonder: why is it considered less socially acceptable to refuse to acknowledge someone who is interrupting you, than it is to interrupt someone? Why isn't the interrupter the "bad guy"?

KeithRB

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int c3=076; <--- This is troublesome
int c4=098; <--- Ahhhh!!!!!! (actually throws a compiler error!)


I don't know why it always makes me crack up, but I love this comment in the 2nd edition of K&R:
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Everyone's favorite trivial change: 8 and 9 are not octal digits


So pre-ANSI, your 098 might not have thrown an error, but I have no idea what it would do.

odometer

As for a leading zero for octal: I doubt that a worse piece of design in programming language syntax exists anywhere. Except maybe for those programming languages which number the months of the year from 0 to 11 (such as C and ECMAScript).


Let's see: I believe that the relevant rule in many programming languages (including the Arduino programming environment) goes like this:
Numbers with only decimal digits (0 through 9) are decimal.
Except if they begin with 0, in which case they are octal.
Except if they contain a decimal point, in which case they are decimal after all.
Please correct me if I am wrong.

AWOL

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Except maybe for those programming languages which number the months of the year from 0 to 11 (such as C and ECMAScript).
I believe if you read the C language standard, you will find not a single reference to months of the year, or how they should be subscripted.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

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