I wrote this in rails console   (3352.3744333333334==3352.3744333333335) #true  and result was true  Notes:  I'm using ruby 2.4.0 and rails 5.0.1
27
Consider the following code:   0.1 + 0.2 == 0.3  -&gt;  false   0.1 + 0.2         -&gt;  0.30000000000000004   Why do these inaccuracies happen?
112920
How can I round a decimal number (floating point) to the nearest integer?   e.g.  1.2 = 1 1.7 = 2
26607
Is the concept of even/odd numbers applicable to decimal numbers? For e.g. - 4.222 is a even number?
80444
$0 is the variable for the top level Ruby program, but is there one for the current method?
44860
I am looking to format a number like 188518982.18 to £188,518,982.18 using Python.  How can I do this?
57093
I think there's a lot for me to learn about data types. Why this happens  double result = ((3/8)*100).ToString();   it gives zero .. should be 37,5 ... :(
67710
$ echo $(( 255 )) 255 $ echo $(( 33 )) 33 $ echo $(( ~33 )) -34 $ echo $(( ~255 )) -256 $    and my kernel is:  $ uname -a Linux HOSTNAME 3.2.0-40-generic-pae #64-Ubuntu SMP Mon Mar 25 21:44:41 UTC 2013 i686 i686 i386 GNU/Linux     QUESTION: ~ is for negating the number AFAIK. But why does ~33 produce -34 and why does ~255 produce -256?
64991
Suppose I want to compare gcc version to see whether the system has the minimum version installed or not.  To check the gcc version, I executed the following  gcc --version | head -n1 | cut -d" " -f4   The output was  4.8.5   So, I wrote a simple if statement to check this version against some other value  if [ "$(gcc --version | head -n1 | cut -d" " -f4)" -lt 5.0.0 ]; then     echo "Less than 5.0.0" else     echo "Greater than 5.0.0" fi   But it throws an error:  [: integer expression expected: 4.8.5   I understood my mistake that I was using strings to compare and the -lt requires integer. So, is there any other way to compare the versions?
59458
Not sure what to do / how to start this... I have equcation of 504 is: $2 \cdot2 \cdot 2 \cdot 3 \cdot 3 \cdot 7$
31758
The documentation for the  function states that you pass it a number, and the positions past the decimal to round. Thus it should do this:  n = 5.59 round(n, 1) # 5.6   But, in actuality, good old floating point weirdness creeps in and you get:  5.5999999999999996   For the purposes of UI, I need to display 5.6. I poked around the Internet and found some  that this is dependent on my implementation of Python. Unfortunately, this occurs on both my Windows dev machine and each Linux server I've tried. .  Short of creating my own round library, is there any way around this?
32263
Can you please tell me how much is (-2) % 5? According to my Python interpreter is 3, but do you have a wise explanation for this?  I've read that in some languages the result can be machine-dependent, but I'm not sure though.
82601
I'm trying to convert an incoming sting of 1s and 0s from stdin into their respective binary values (where a string such as "11110111" would be converted to 0xF7). This seems pretty trivial but I don't want to reinvent the wheel so I'm wondering if there's anything in the C/C++ standard libs that can already perform such an operation?
96922
Why when I save a value of say 40.54 in SQL Server to a column of type Real does it return to me a value that is more like 40.53999878999 instead of 40.54?  I've seen this a few times but have never figured out quite why it happens.  Has anyone else experienced this issue and if so causes it?
44849
Does anyone know why, using SQLServer 2005  SELECT CONVERT(DECIMAL(30,15),146804871.212533)/CONVERT(DECIMAL (38,9),12499999.9999)   gives me 11.74438969709659,  but when I increase the decimal places on the denominator to 15, I get a less accurate answer:  SELECT CONVERT(DECIMAL(30,15),146804871.212533)/CONVERT(DECIMAL (38,15),12499999.9999)   give me 11.74438969
76434
I have just started the MIT Introduction to Algorithms course through the material posted online. Along with the course I have also decided to learn/enhance my Ruby skills by coding the algorithms in it.   I am on the first algorithm given, which is Insertion sort, and I have the following code typed up but I am getting this error when I run it:     insertionsort.rb:5:in `>': comparison of Fixnum with nil failed (ArgumentError)   def  insertionsort(num) for j in 2..num.length     key = num[j]     i = j - 1     while i &gt; 0 and num[i] &gt; key         num[i+1] = num[i]         i = i - 1     end     num[i+1] = key end  puts num end  numbers = [23,34,46,87,12,1,66]  insertionsort(numbers)   I'm sure it is a fairly basic problem but I just can't grasp what it is at the moment. Any  help or tips would be very much appreciated.
9452
In Python, how can I parse a numeric string like "545.2222" to its corresponding float value, 545.2222? Or parse the string "31" to an integer, 31?  I just want to know how to parse a float str to a float, and (separately) an int str to an int.
90908
how to calculate float numbers: with bash  example        DRIVER_MEMORY=$(( 5 * 0.6 * 0.9 )) -bash: 5 * 0.6 * 0.9 : syntax error: invalid arithmetic operator (error token is ".6 * 0.9 ")   remark - results must be integer number  - so we can round the number to down