Binary/Decimal/Hexadecimal Converter Testing

MathsIsFun · 2012-09-08 10:36:42

Have been rewriting my Binary/Decimal/Hexadecimal Converter from the ground up, using my "Full Precision" library.

Can you guys throw some different numbers at it to see how it performs?

Binary/Decimal/Hexadecimal Converter - Test Version

Let me know any oddities, cheers!

bobbym · 2012-09-08 10:50:30

Hi MIF;

So far it looks pretty good.

MathsIsFun · 2012-09-08 16:59:05

Excellent ... so far

Bob · 2012-09-08 19:55:19

hi MathsIsFun

Tests out OK so far for me; whole, fractional and negative.

Bob

Jai Ganesh · 2012-09-08 20:24:03

Hi MathsIsFun,

The binary/decimal/hexa-decimal converter works very well!

Excellent, MathsIsFun!

MathsIsFun · 2012-09-09 00:08:30

Thanks.

Any suggestions for improvement?

I had someone email me asking for leading zeros, but it may look OK having 0010 as a binary, but what should that be as a decimal? 02? 002?

Bob · 2012-09-09 00:39:45

Leading zeros:

That depends on what the user wants from the conversions. I'd have thought that spaces to make a fixed 'byte' size might be more useful; thus:

0011 0101
234 567.234 456
FFFF FFFF

0001 0101.1111 1100
023 456 789.123 456 789
000F ABCD 1234.FFFF 6767 6700

So pad out the bin and hex to blocks of 4 with zeros front and rear and the decimal in similar blocks of 3.

btw. These are 6 independent examples not 2 with conversions.

Bob

bobbym · 2012-09-09 02:52:05

Hi MIF;

Maybe here is a good spot to indicate to the user a strange phenomenon that occurs in programming more than in mathematics.

If you enter .5374 in decimal you get

and

This might suggest that is the exact answer. If you carry more digits you get

and

(Pardon the lowercase letters, Mathematica thinks they are not worthy of Capitalization.)
You can continue this process because although .5374 terminates in base 10 it may not in other bases. For instance, 1 / 10 is .1 in base 10 but is non terminating in base 2. An ellipsis ... could be put to suggest that there are more digits.

anonimnystefy · 2012-09-09 03:26:29

Hi MIF

The converter shows strange behavior when I try to put in "1.2." in the hexadecimal box with a dot after the 2. The output is okay for the binary number, but it is weird for the decimal conversion. Maybe you should just disallow adding 2 dots altogether. The same goes for "e". Adding e's after the first changes the results.

There should also be a way to enter recurring decimals.

Otherwise, it is a very nice piece of work (like every other Flash "app" you made ).

MathsIsFun · 2014-03-27 15:48:04

A new test version needs testing: Binary/Decimal/Hexadecimal Converter - Test Version

I often get contacted by people who confuse "computer binary" (limited bits), with treating a binary number as a number. They insisting that "-1 decimal" should be "11111111 binary" (with the first bit being a sign bit), so I have tried to satisfy all comers with a drop-down box of common types.

The trouble is that it opens up many possible errors, so could you kind folk try out lots of things and tell me if they work for you?

Consider:
* positive/negative
* fractional values (like 1.1)
* changing binary, decimal or hex value
* as a number/8-bit/etc.

Cheers!

bobbym · 2014-03-27 20:45:41

Hi MIF;

What is the difference between the menu item 0001 and number?

MathsIsFun · 2014-03-27 22:13:37

0001 is supposed to pad binary with zeros to make groups of 4 (so it matches hex)

bobbym · 2014-03-28 19:44:17

Hi;

So far the signed 8 bit is working fine. Doing more testing of the others.

MathsIsFun · 2014-03-28 19:46:47

Thanks for that.

bobbym · 2014-03-28 19:49:40

Hi;

It will take some time with the 16bit signed integers and fractions.

bobbym · 2014-03-29 13:12:15

Hi MIF;

Are you using a two's complement for your negative numbers?

MathsIsFun · 2014-03-29 13:13:07

Yes, I believe that is the standard in computing.

bobbym · 2014-03-29 13:27:15

Hi;

Everything working all the way to the signed 32 bits for integers. Will keep checking and then to decimals.

I am fairly confident in the results except I have not checked negative signed 32 bit floats.

MathsIsFun · 2014-04-01 15:40:34

That is really kind of you, thanks.

So it is nearly ready to go live (and replace the existing one).

bobbym · 2014-04-01 20:02:46

Hi;

I would like to try one more thing but I will require your help. I can not find a good description of the implementation of signed 32 bit for floats like 45.567 etc. I am using everything left of the rightmost bit is inverted. Can you explain yours?

Math Is Fun Forum

#1 2012-09-08 10:36:42

Binary/Decimal/Hexadecimal Converter Testing

#2 2012-09-08 10:50:30

Re: Binary/Decimal/Hexadecimal Converter Testing

#3 2012-09-08 16:59:05

Re: Binary/Decimal/Hexadecimal Converter Testing

#4 2012-09-08 19:55:19

Re: Binary/Decimal/Hexadecimal Converter Testing

#5 2012-09-08 20:24:03

Re: Binary/Decimal/Hexadecimal Converter Testing

#6 2012-09-09 00:08:30

Re: Binary/Decimal/Hexadecimal Converter Testing

#7 2012-09-09 00:39:45

Re: Binary/Decimal/Hexadecimal Converter Testing

#8 2012-09-09 02:52:05

Re: Binary/Decimal/Hexadecimal Converter Testing

#9 2012-09-09 03:26:29

Re: Binary/Decimal/Hexadecimal Converter Testing

#10 2014-03-27 15:48:04

Re: Binary/Decimal/Hexadecimal Converter Testing

#11 2014-03-27 20:45:41

Re: Binary/Decimal/Hexadecimal Converter Testing

#12 2014-03-27 22:13:37

Re: Binary/Decimal/Hexadecimal Converter Testing

#13 2014-03-28 19:44:17

Re: Binary/Decimal/Hexadecimal Converter Testing

#14 2014-03-28 19:46:47

Re: Binary/Decimal/Hexadecimal Converter Testing

#15 2014-03-28 19:49:40

Re: Binary/Decimal/Hexadecimal Converter Testing

#16 2014-03-29 13:12:15

Re: Binary/Decimal/Hexadecimal Converter Testing

#17 2014-03-29 13:13:07

Re: Binary/Decimal/Hexadecimal Converter Testing

#18 2014-03-29 13:27:15

Re: Binary/Decimal/Hexadecimal Converter Testing

#19 2014-04-01 15:40:34

Re: Binary/Decimal/Hexadecimal Converter Testing

#20 2014-04-01 20:02:46

Re: Binary/Decimal/Hexadecimal Converter Testing

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