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  • Checking to see if a number is evenly divisible by other numbers with recursion in Python

    - by Ernesto
    At the risk of receiving negative votes, I will preface this by saying this is a midterm problem for a programming class. However, I have already submitted the code and passed the question. I changed the name of the function(s) so that someone can't immediately do a search and find the correct code, as that is not my purpose. I am actually trying to figure out what is actually MORE CORRECT from two pieces that I wrote. The problem tells us that a certain fast food place sells bite-sized pieces of chicken in packs of 6, 9, and 20. It wants us to create a function that will tell if a given number of bite-sized piece of chicken can be obtained by buying different packs. For example, 15 can be bought, because 6 + 9 is 15, but 16 cannot be bought, because no combination of the packs will equal 15. The code I submitted and was "correct" on, was: def isDivisible(n): """ n is an int Returns True if some integer combination of 6, 9 and 20 equals n Otherwise returns False. """ a, b, c = 20, 9, 6 if n == 0: return True elif n < 0: return False elif isDivisible(n - a) or isDivisible(n - b) or isDivisible(n - c): return True else: return False However, I got to thinking, if the initial number is 0, it will return True. Would an initial number of 0 be considered "buying that amount using 6, 9, and/or 20"? I cannot view the test cases the grader used, so I don't know if the grader checked 0 as a test case and decided that True was an acceptable answer or not. I also can't just enter the new code, because it is a midterm. I decided to create a second piece of code that would handle an initial case of 0, and assuming 0 is actually False: def isDivisible(n): """ n is an int Returns True if some integer combination of 6, 9 and 20 equals n Otherwise returns False. """ a, b, c = 20, 9, 6 if n == 0: return False else: def helperDivisible(n): if n == 0: return True elif n < 0: return False elif helperDivisible(n - a) or helperDivisible(n - b) or helperDivisible(n - c): return True else: return False return helperDivisible(n) As you can see, my second function had to use a "helper" function in order to work. My overall question, though, is which function do you think would provide the correct answer, if the grader had tested for 0 as an initial input?

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  • Does ASP.net Report Viewer / Reports require Reporting Services on SQL server

    - by soldieraman
    I have an application that makes use of Report Viewer and Report (.rdlc) files. Does this mean that I need to have "Reporting Services" installed on my SQL server?? Also would not having "SQL Server Analysis services" affect me any way I want to make sure I keep using - SQL Server Profiler - SQL Server Agent - create and run management tasks - Reporting services if the first question's answer is true.

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  • Access Iphone Pim Data via web app

    - by Eric
    i think i know the answer to this question, but just want to make sure before i dismiss the possibility. is it possible with user permission for my web app to access pim data like the address book on a iphone, similar to how a web app can access the location service?

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  • hi question about mathematics

    - by davit-datuashvili
    hi i have one question i know site mathoverflow.com and have posted question but unfortunately no one give me answer if i post here can anybody help me? it is not homework because i know somebody will say it is homework what u have tried but this is not so i dont know how solve please if it is possible i will post here ok?

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  • PHP Date Manipulations

    - by Ajith
    I need to get previous 30 days from a specific date which is available from database(eg: 2010-05-23 12:36:29).I am try it by using date('d', strtotime("-30 days")) Which is getting the currect answer what i looking for but it is not help me to enter date from database.Please help me to solve the issue.

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  • My mental block - struggling to learn Objective C

    - by iqessar
    Hello people, this would be my first question after signing up! Anyway heres my question, I did Java at university and I was always told I am a good programmer. However I never pursued it as a career - I went into support and management instead. Im pretty much bored with my job, I have therefore started to learn Objective C so that I can develop apps for the iphone. I am currently watching several different Videos / Books. My problem is that when I go through the Apple documentation, although I understand most of it, sometimes I stumble. I believe that because you/we have the Apple documentation (i.e. Framework references) , everything should be clear, and therefore you should have no need to refer to a book or video (in order to learn how to use a particular class). But I alway do refer to a book and video and subsequently feel guilty as I believe the framework reference should be enough. (I therefore feel I am not up to being a programmer) I also believe that you shouldn't need example code in order to learn how to use a particular class because Apple provides documentation for each class, but AGAIN I find my self googling example code and I find my answer like that - again I feel guilty for doing this. Am I right in saying that Apple documentation is simply not clear? and that its ok to refer to a video/book or google? or forums for that matter? I have proffesional programmers who tell me that I am worrying too much and that I should get on with it and use all the resources that I have. I just cant seem to get round this mental block that I have in my head. When I start a programming project I am able to use the excellent search skills that I have to find the code I need, copy and paste it (yes I do understand it) BUT then I feel guilty telling myself that why didn't you think up the code yourself???? Therefore your not a real programmer, your just good at googling. Currently I am going through 20+ books so that I can learn most of the frameworks, syntax etc to develop iphone apps. I believe if I do this, then when I think of a project I can make it quickly. Should I read a few books, like 2-3 and then just start a project /app , and if I get stuck just google it and get the code I need? Can anybody please answer my questions?

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  • Why do we need mocking frameworks like Easymock , JMock or Mockito?

    - by Praneeth
    Hi, We use hand written stubs in our unit tests and I'm exploring the need for a Mock framework like EasyMock or Mockito in our project. I do not find a compelling reason for switching to Mocking frameworks from hand written stubs. Can anyone please answer why one would opt for mocking frameworks when they are already doing unit tests using hand written mocks/stubs. Thanks

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  • Can I run a 64-bit VMWare image on a 32-bit machine?

    - by John Sibly
    Can I run a 64-bit VMWare image on a 32-bit machine? I've Googled this but there doesn't seem to be a conclusive answer. I know that it would have to be completely emulated and would run like a dog - but slow performance isn't necessarily an issue as I'm just interested in testing some of my background services code on 64-bit platforms.

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  • Running perl script?

    - by Jeff
    I know this is a real basic and stupid question but how do I run a perl script on OSX? I honestly can't find the answer anywhere! Presumably I have to run a command in Terminal but what? Thanks in advance, Jeff

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  • asp.net custom control control state

    - by pranay
    what is advantage of using control state instead of view state when i create custom control in asp.net ? so i want to know why to use control state ? can some please provide me good article or descriptive answer for this ?

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  • Cannot have a qualifier in the select list while performing a JOIN w/ USING keyword.

    - by JuiceBerry123
    I am looking at a practice test that doesn't have explanations about the correct answers. The question I'm confused about basically asks why the following SQL statement can never work: SELECT oi.order_id, product_jd, order_date FROM order_items oi JOIN orders o USING(order_id); The answer it gave was: "The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list" Can someone elaborate on this? I am pretty stumped.

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  • Override browser "Find" feature

    - by Trevor Burnham
    I'm wondering whether it's possible to use JavaScript to intercept or prevent the user from using the browser's "Find" feature to find text on the page. (Trust me, I have a good reason!) I'm guessing the answer is "no," beyond the obvious intercepting Cmd/Ctrl+F. A second-best solution would be to intercept the text highlighting that the browser performs during a Find. Is there any way to do this, in any browser?

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