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  • Finding an odd perfect number

    - by Coin Bird
    I wrote these two methods to determine if a number is perfect. My prof wants me to combine them to find out if there is an odd perfect number. I know there isn't one(that is known), but I need to actually write the code to prove that. The issue is with my main method. I tested the two test methods. I tried debugging and it gets stuck on the number 5, though I can't figure out why. Here is my code: public class Lab6 { public static void main (String[]args) { int testNum = 3; while (testNum != sum_of_divisors(testNum) && testNum%2 != 0) testNum++; } public static int sum_of_divisors(int numDiv) { int count = 1; int totalDivisors = 0; while (count < numDiv) if (numDiv%count == 0) { totalDivisors = totalDivisors + count; count++; } else count++; return totalDivisors; } public static boolean is_perfect(int numPerfect) { int count = 1; int totalPerfect = 0; while (totalPerfect < numPerfect) { totalPerfect = totalPerfect + count; count++; } if (numPerfect == totalPerfect) return true; else return false; } }

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  • How to camel-case where consecutive words have numbers?

    - by Rob I
    Just wondering if anybody has a good convention to follow in this corner-corner-corner case. I really use Java but figured the C# folks might have some good insight too. Say I am trying to name a class where two consecutive words in the class name are numeric (note that the same question could asked about identifier names). Can't get a great example, but think of something like "IEEE 802 16 bit value". Combining consecutive acronyms is doable if you accept classnames such as HttpUrlConnection. But it seriously makes me throw up a little to think of naming the class IEEE80216BitValue. If I had to pick, I'd say that's even worse than IEEE802_16BitValue which looks like a bad mistake. For small numbers, I'd consider IEEE802SixteenBitValue but that doesn't scale that well. Anyone out there have a convention? Seems like Microsoft's naming guidelines are the only ones that describe acronym naming in enough detail to get the job done, but nobody has addressed numbers in classnames.

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  • How can I make these Google Analytics numbers add up? (Frequency & Recency)

    - by Joe
    Here's a screen shot from Google Analytics. It's my last months traffic, and this is the 'Frequency & Recency' tab. So I believe that if I add up all the numbers under 'visits' I get 11,432, which is right, and if I add up all the numbers under 'pageviews' I get 14,785 and that's right as well. But, let's take the last line - the last line appears to say that 71 people, visited more than 51 times each, and they viewed a total of 243 pages between them - that doesn't seam to make any sense - did they view 9% of a page each time? So that's clearly wrong - what's the error in my calculation?

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  • new >> how would i read a file that has 3 columns and each column contains 100 numbers into an array

    - by user320950
    int exam1[100];// array that can hold 100 numbers for 1st column int exam2[100];// array that can hold 100 numbers for 2nd column int exam3[100];// array that can hold 100 numbers for 3rd column void main() { ifstream infile; int num; infile.open("example.txt");// file containing numbers in 3 columns if(infile.fail()) // checks to see if file opended { cout << "error" << endl; } while(!infile.eof()) // reads file to end of line { for(i=0;i<100;i++); // array numbers less than 100 { while(infile >> [exam]); // while reading get 1st array or element ???// how will i go read the next number infile >> num; } } infile.close(); }

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  • how to generate uncorrelated random numbers in repeated calls in parallel?

    - by user1446948
    I want to write a function which will be repeatedly called by other functions many times. Inside this function it is supposed to generate a lot of random numbers and this part will be treated in parallel. If only for one run, the seed can be chosen differently for each thread, so that the random numbers will be uncorrelated. However, if this function will be called the 2nd time, it seems that the random numbers will repeat unless the seed will be again changed during the later calls. So my question is, is there a good way to generate the random numbers or reset the seed so that the random numbers generated by repeated calls to this function and also by different threads are really random? Thank you.

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  • How to change the margin of code's frame of showexpl.sty when numbers=none?

    - by suugaku
    Hi all, I want to align the code's frame with the formated text's frame. If the numbers=left,the mission is accomplished by configuring xleftmargin, xrightmargin, framesep, and numbersep. However, when I set numbers=none, I cannot accomplish my mission by configuring those properties. Regardless of the values set to those properties, the code's frame remains unchanged and expands beyond the \textwidth. Please see my code snippet below. Thank you in advance. \documentclass[a4paper,11pt,twoside,final,dvips]{book} \usepackage{xcolor} \usepackage{showexpl} \lstset{% breaklines=true, breakindent=0pt, basicstyle=\color{magenta}\ttfamily\tiny, keywordstyle=\color{blue}\sffamily\bfseries, identifierstyle=\color{black}, commentstyle=\color{cyan}\itshape, stringstyle=\rmfamily, showstringspaces=false, tabsize=2, %========== FRAME ========== frame=single, framerule=0.4pt, rulecolor=\color{red}, framesep=3pt, %========== MARGIN ========== xleftmargin=3.4pt, xrightmargin=3.4pt, %========== NUMBER ========== numbers=left, numberstyle=\color{red}\tiny, numbersep=6.4pt, explpreset={language={[LaTeX]TeX},pos=b}% } \usepackage{lipsum} \usepackage{printlen} %------------------------- MARKER ------------------------ \newlength{\halftextwidth} \setlength{\halftextwidth}{\textwidth*\real{0.5}} \newcommand*{\MARKER}% {% \uselengthunit{cm} \par\noindent\strut\vrule% \hrulefill~% {\color{red}\scriptsize half text area: \printlength{\halftextwidth}}% ~\hrulefill\vrule% \hrulefill~% {\color{red}\scriptsize half text area: \printlength{\halftextwidth}}% ~\hrulefill\vrule% \marginpar% {% \strut\vrule\hrulefill~% {\color{red}\scriptsize margin area: \rndprintlength{\marginparwidth}}% ~\hrulefill\vrule% }% \par% }% \begin{document} \chapter{I love \LaTeXe, but $\cdots$} \section{With numbers=left} \vfill \MARKER \begin{LTXexample} \lipsum[1-1] \end{LTXexample} \MARKER \vfill \pagebreak \section{With numbers=none} \vfill \MARKER % Any values that are assigned to xleftmargin or xrightmargin % have no effect on the margin of the code's frame. \begin{LTXexample}[numbers=none,xleftmargin=10.4pt,xrightmargin=10.4pt] \lipsum[1-1] \end{LTXexample} \MARKER \vfill \end{document}

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  • Is there a modern free D?VCS that can ignore mainframe sequence numbers?

    - by Brent.Longborough
    I'm looking at migrating a large suite of IBM Assembler Language programs, from a vcs based on "filenames include version numbers", to a modern vcs which will give me, among other things, the ability to branch and merge. These files have 80-column records, the last 8 columns being an almost-meaningless sequence number. For a number of reasons which I don't really want to waste space by going into, I need the vcs to ignore (but hopefully preserve in some well-defined manner) the sequence number columns, and to diff and patch based only on the contents of the first 72 columns. Any ideas? Just to clarify "ignore but preserve": I accept it's a bit vague, as I haven't fully collected my ideas yet. It would be something along the lines of this: "When merging/patching, if one side has sequence numbers, output them; if more-than-one side has sequence numbers, use those present in file (1|2|3)" Why do I want to preserve sequence numbers? First, they really are sequence numbers. Second, I want to reintegrate this stuff back onto the mainframe, where sequence numbers can be terribly significant. (Those of you who know what "SMP/E" means will understand. Those who don't, be happy, but tremble...) I've just realised I hadn't accepted an answer. Difficult choice, but @Noldorin comes closest to where I have to go.

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  • Can someone confirm how Microsoft Excel 2007 internally represents numbers?

    - by Jon
    I know the IEEE 754 floating point standard by heart as I had to learn it for an exam. I know exactly how floating point numbers are used and the problems that they can have. I can manually do any operation on the binary representation of floating point numbers. However, I have not found a single source which unambiguously states that excel uses 64 bit floating point numbers to internally represent every single cell "type" in excel except for text. I have no idea whether some of the types use signed or unsigned integers and some use 64 bit floating point. I have found literally trillions of articles which 1) describe floating point numbers and then 2) talk about being careful with excel because of floating point numbers. I have not found a single statement saying "all types are 64 bit floating point numbers except text". I have not found a single statement which says "changing the type of a cell only changes its visual representation and not its internal representation, unless you change the type from text to some other type which is not text or you change some other type which is not text to text". This is literally all I want to know, and it's so simple and axiomatic that I am amazed that I can find trillions of articles and pages which talk around these statements but do not state them directly.

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  • How to use multiple identity numbers in one table?

    - by vincer
    I have an web application that creates printable forms, these forms have a unique number on them, the problem is I have 2 forms that separate numbers need to be created for them. ie) Form1- Numbered 2000000-2999999 Form2- Numbered 3000000-3999999 dbo.test2 - is my form information table Tsel - is my autoinc table for the 3000000 series numbers Tadv - is my autoinc table for the 2000000 series numbers What I have done is create 2 tables with just autoinc row (one for 2000000 series numbers and one for 3000000 series numbers), I then created a trigger to add a record to the coresponding table, read back the autoinc number and add it to my table that stores the form information including the just created autoinc number for the right series of forms. Although it does work, I'm concerned that the numbers will get messed up under load. I'm not sure the @@IDENTITY will always return the right value when many people are using the system. (I cannot have duplicates and I need to use the numbering form show above. See code below. ** TRIGGER ** CREATE TRIGGER MAKEANID2 ON dbo.test2 AFTER INSERT AS SET NOCOUNT ON declare @someid int declare @someid2 int declare @startfrom int declare @test1 varchar(10) select @someid=@@IDENTITY select @test1 = (Select name1 from test2 where sysid = @someid ) if @test1 = 'select' begin insert into Tsel Default values select @someid2 = @@IDENTITY end if @test1 = 'adv' begin insert into Tadv Default values select @someid2 = @@IDENTITY end update test2 set name2=(@someid2) where sysid = @someid SET NOCOUNT OFF

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  • Problem counting item frequency on T-SQL

    - by Raúl Roa
    I'm trying to count the frequency of numbers from 1 to 100 on different fields of a table. Let's say I have the table "Results" with the following data: LottoId Winner Second Third --------- --------- --------- --------- 1 1 2 3 2 1 2 3 I'd like to be able to get the frequency per numbers. For that I'm using the following code: --Creating numbers temp table CREATE TABLE #Numbers( Number int) --Inserting the numbers into the temp table declare @counter int set @counter = 0 while @counter < 100 begin set @counter = @counter + 1 INSERT INTO #Numbers(Number) VALUES(@counter) end -- SELECT #Numbers.Number, Count(Results.Winner) as Winner,Count(Results.Second) as Second, Count(Results.Third) as Third FROM #Numbers LEFT JOIN Results ON #Numbers.Number = Results.Winner OR #Numbers.Number = Results.Second OR #Numbers.Number = Results.Third GROUP BY #Numbers.Number The problem is that the counts are repeating the same values for each number. In this particular case I'm getting the following result: Number Winner Second Third --------- --------- --------- --------- 1 2 2 2 2 2 2 2 3 2 2 2 ... When I should get this: Number Winner Second Third --------- --------- --------- --------- 1 2 0 0 2 0 2 0 3 0 0 2 ... What am I missing?

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  • bubble sort logic error

    - by Arianule
    I was trying a basic sorting exercise and I was hoping I could receive some help with what is probably a basic logic error. int[] numbers = new int[] { 2, 5, 11, 38, 24, 6, 9, 0, 83, 7 }; for (int loop = 0; loop < numbers.Length; loop++) { Console.WriteLine(numbers[loop]); } Console.WriteLine("Performing a bubble sort"); bool flag = false; do { for (int loop = 0; loop < numbers.Length - 1; loop++) { if (numbers[loop] > numbers[loop + 1]) { int temporary = numbers[loop]; numbers[loop] = numbers[loop + 1]; numbers[loop + 1] = temporary; flag = true; } } } while (flag == false); for (int loop = 0; loop < numbers.Length; loop++) { Console.WriteLine(numbers[loop]); } kind regards arianule

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  • How to change internal page numbers in the meta data of a PDF?

    - by YGA
    I have a pdf document I created through non-Acrobat means (printing to pdf, then merging a bunch of pdfs), but I'd like to manually change the page numbers (i.e. the first several pages are simply title pages, the page that is labeled "page 1" is really the 7th sheet of the pdf). What's the simplest (and ideally, free) way to do this? To be clear, I am not trying to change the numbers on the pages themselves, but the page numbers in the "metadata" that the pdf stores (the pages themselves are already numbered correctly; I just want "go to page 1" to go to the page labeled 1, which could be sheet 7). For what it's worth, I'm on Windows, though I have access to Macs as well.

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  • How to change internal page numbers in the meta data of a PDF?

    - by YGA
    I have a pdf document I created through non-Acrobat means (printing to pdf, then merging a bunch of pdfs), but I'd like to manually change the page numbers (i.e. the first several pages are simply title pages, the page that is labeled "page 1" is really the 7th sheet of the pdf). What's the simplest (and ideally, free) way to do this? To be clear, I am not trying to change the numbers on the pages themselves, but the page numbers in the "metadata" that the pdf stores (the pages themselves are already numbered correctly; I just want "go to page 1" to go to the page labeled 1, which could be sheet 7). For what it's worth, I'm on Windows, though I have access to Macs as well.

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  • Eliminating Magic Numbers: When is it time to say "No"?

    - by oosterwal
    We're all aware that magic numbers (hard-coded values) can wreak havoc in your program, especially when it's time to modify a section of code that has no comments, but where do you draw the line? For instance, if you have a function that calculates the number of seconds between two days, do you replace seconds = num_days * 24 * 60 * 60 with seconds = num_days * HOURS_PER_DAY * MINUTES_PER_HOUR * SECONDS_PER_MINUTE At what point do you decide that it is completely obvious what the hard-coded value means and leave it alone?

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  • How can I detect short phone numbers in iPhone web views?

    - by Pedro
    G'day All Most Australian phone numbers are 10 digits with the 1st 2 optional if they're a local area code. For those setting... viewer.dataDetectorTypes = UIDataDetectorTypePhoneNumber; on a web view works. We also have a range of 6 digit phone numbers (usually written xxx xxx or xx xxxx) which aren't being detected in my app. Is there a way to detect those phone numbers as well? Cheers & TIA, Pedro :)

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  • What's the easiest way to parse numbers in clojure?

    - by Rob Lachlan
    I've been using java to parse numbers, e.g. (. Integer parseInt numberString) Is there a more clojuriffic way that would handle both integers and floats, and return clojure numbers? I'm not especially worried about performance here, I just want to process a bunch of white space delimited numbers in a file and do something with them, in the most straightforward way possible. So a file might have lines like: 5 10 0.0002 4 12 0.003 And I'd like to be able to transform the lines into vectors of numbers.

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  • Is there a standard for storing normalized phone numbers in a database?

    - by Eric Z Beard
    What is a good data structure for storing phone numbers in database fields? I'm looking for something that is flexible enough to handle international numbers, and also something that allows the various parts of the number to be queried efficiently. [Edit] Just to clarify the use case here: I currently store numbers in a single varchar field, and I leave them just as the customer entered them. Then, when the number is needed by code, I normalize it. The problem is that if I want to query a few million rows to find matching phone numbers, it involves a function, like where dbo.f_normalizenum(num1) = dbo.f_normalizenum(num2) which is terribly inefficient. Also queries that are looking for things like the area code become extremely tricky when it's just a single varchar field. [Edit] People have made lots of good suggestions here, thanks! As an update, here is what I'm doing now: I still store numbers exactly as they were entered, in a varchar field, but instead of normalizing things at query time, I have a trigger that does all that work as records are inserted or updated. So I have ints or bigints for any parts that I need to query, and those fields are indexed to make queries run faster.

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  • How can I store an inventory-like list of numbers?

    - by Rachel
    I've got a list of number that I need to keep track of. The numbers are loosely related, but represent distinctly different items. I'd like to keep a list of the numbers but be able to refer to them by name so that I can call them and use them where needed easily. Kind of like an inventory listing, where the numbers all refer to a part ID and I'd like to call them idPart1, idPart2, idPart3 so their purpose is easily identifiable when they are used. What would be the best way to do this? 1)Define a structure. Say, PartIds. A number of int members will be included, part1, part2 etc. To use, an instance of the structure will be created, values assigned to the members, and the numbers will be used by saying struct.member as needed. 2)Define an enumeration. Use part1, part2 as the enum literals. Store the actual values in a vector or list, each one at the index corresponding to the value of the number's name within the enum. Use the enum literals to retrieve the values, list[enumLit]. 3)Something completely different There's nothing else I need to do with the numbers - just look them up every once in a while. Since there's no processing, I kind of think a new class for them is overkill, but I'm willing to be convinced otherwise. Any suggestions?

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  • Is there a SQL Server error numbers C# wrapper anyone knows of?

    - by Mr Grok
    I really want to do something useful when a PK violation occurs but I hate trapping error numbers... they just don't read right without comments (they're certainly not self documenting). I know I can find all the potential error numbers at SQL Server books online but I really want to be able to pass the error number to some helper class or look it up against a Dictionary of some sort rather than have non-descript err numbers everywhere. Has anyone got / seen any code anywhere that encapsulates the SQL Server Error numbers in this way as I don't want to re-invent the wheel (or I'm lazy maybe).

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  • Why can't decimal numbers be represented exactly in binary?

    - by Barry Brown
    There have been several questions posted to SO about floating-point representation. For example, the decimal number 0.1 doesn't have an exact binary representation, so it's dangerous to use the == operator to compare it to another floating-point number. I understand the principles behind floating-point representation. What I don't understand is why, from a mathematical perspective, are the numbers to the right of the decimal point any more "special" that the ones to the left? For example, the number 61.0 has an exact binary representation because the integral portion of any number is always exact. But the number 6.10 is not exact. All I did was move the decimal one place and suddenly I've gone from Exactopia to Inexactville. Mathematically, there should be no intrinsic difference between the two numbers -- they're just numbers. By contrast, if I move the decimal one place in the other direction to produce the number 610, I'm still in Exactopia. I can keep going in that direction (6100, 610000000, 610000000000000) and they're still exact, exact, exact. But as soon as the decimal crosses some threshold, the numbers are no longer exact. What's going on? Edit: to clarify, I want to stay away from discussion about industry-standard representations, such as IEEE, and stick with what I believe is the mathematically "pure" way. In base 10, the positional values are: ... 1000 100 10 1 1/10 1/100 ... In binary, they would be: ... 8 4 2 1 1/2 1/4 1/8 ... There are also no arbitrary limits placed on these numbers. The positions increase indefinitely to the left and to the right.

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