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  • what is the point of return in ruby?

    - by Sam
    What is the difference between return and just putting a variable such as the following: return def write_code(number_of_errors) if number_of_errors > 1 mood = "WTF" else mood = "No Problem" end mood end no return def write_code(number_of_errors) if number_of_errors > 1 mood = "WTF" else mood = puts "No Problem" end return mood end

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  • By-name repeated parameters

    - by Green Hyena
    How to pass by-name repeated parameters in Scala? The following code fails to work: scala> def foo(s: (=> String)*) = { <console>:1: error: no by-name parameter type allowed here def foo(s: (=> String)*) = { ^ Is there any other way I could pass a variable number of by name parameters to the method?

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  • Rails 3: How to validate that A < B where A and B are both model attributes ?

    - by Misha Moroshko
    I would like to validate that customer_price >= my_price. I tried the following: class Product < ActiveRecord::Base attr_accessor :my_price validates_numericality_of :customer_price, :greater_than_or_equal_to => my_price ... end (customer_price is a column in the Products table in the database, while my_price isn't.) Here is the result: NameError in ProductsController#index undefined local variable or method `my_price' for #<Class:0x313b648> What is the right way to do this in Rails 3 ?

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  • how I can overcome this error C2679: binary '>>' : no operator found which takes a right-hand oper

    - by hussein abdullah
    #include <iostream> using std::cout; using std::cin; using std::endl; #include <cstring> void initialize(char[],int*); void input(const char[] ,int&); void print ( const char*,const int); void growOlder (const char [], int* ); bool comparePeople(const char* ,const int*,const char*,const int*); int main(){ char name1[25]; char name2[25]; int age1; int age2; initialize (name1,&age1); initialize (name2,&age2); print(name1,age1); print(name2,age2); input(name1,age1); input(name2,age2); print(name1,age1); print(name2,age2); growOlder(name2,&age2); if(comparePeople(name1,&age1,name2,&age2)) cout<<"Both People have the same name and age "<<endl; return 0; } void input(const char name[],int &age) { cout<<"Enter a name :"; cin>>name ; cout<<"Enter an age:"; cin>>age; cout<<endl; } void initialize ( char name[],int *age) { name[0]='\0'; *age=0; } void print ( const char name[],const int age ) { cout<<"The Value stored in variable name is :" <<name<<endl <<"The Value stored in variable age is :" <<age<<endl<<endl; } void growOlder(const char name[],int *age) { cout<< name <<" has grown one year older\n\n"; *age++; } bool comparePeople (const char *name1,const int *age1, const char *name2,const int *age2) { return(*age1==*age2 && !strcmp(name1,name2)); }

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  • Metaprogramming ActiveRecord Rails

    - by Dimitar Vouldjeff
    Hi, I have the following code in my project`s lib directory module Pasta module ClassMethods def self.has_coordinates self.send :include, InstanceMethods end end module InstanceMethods def coordinates [longitude ||= 43.0, latitude ||= 25.0] end end ActiveRecord::Base.extend ClassMethods end And it should create a class method for ActiveRecord::Base - has_coordinates - which I can "assign" to models... But I receive the error undefined local variable or method 'has_coordinates' Thanks in advance!

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  • Why can I not access this class member in python?

    - by Peter Smit
    I have the following code class Transcription(object): WORD = 0 PHONE = 1 STATE = 2 def __init__(self): self.transcriptions = [] def align_transcription(self,model,target=Transcription.PHONE): pass The important part here is that I would like to have a class member as default value for a variable. This however gives the following error: NameError: name 'Transcription' is not defined Why is this not possible and what is the right (pythonic) way to do something like this.

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  • Unsigned Integer

    - by viswanathan
    I was curious to know what would happen if i assign a negative value to an unsigned variable. The code will look somewhat like this. unsigned int nVal = 0; nVal = -5; It didnt give me any compiler error. When i ran the nVal was having strange value. Could it be that some 2's complement value gets assigned to nVal.

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  • Customizing Mail Message in SSIS Event Handler

    - by Eric Ness
    I want to add an email notification to an SSIS 2005 package event handler. I've added a Send Mail task to the event handler. I'd like to customize the email body to include things like the error description. I've tried including @[System::ErrorDescription] in the MessageSource field, but the mail message doesn't include the value of ErrorDescription only the name of the variable.

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  • Grid 960 bug in Internet Explorer 8?

    - by mg1075
    If you go to the "Variable Grid System" generator and have: column width = 20 number of columns = 12 and gutter width = 60 ...the system provides a content width of 900 and a full width of 960. http://www.spry-soft.com/grids/ Now, this is all fine and dandy in Firefox, Chrome, and even IE6, but when you load those settings in IE8, you end up with the actual full width as 1000px, not 960px. Has this issue been encountered before?

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  • What web servers use `COOKIE` instead of `HTTP_COOKIE`?

    - by Smack my batch up
    In the source code of the Perl module CGI.pm, in the submodule CGI::Cookies.pm, there is the following line: $raw_cookie = $ENV{HTTP_COOKIE} || $ENV{COOKIE}; I'm interested in $ENV{COOKIE} here. Are there any web servers (obsolete or otherwise) which transmit cookie information using the COOKIE environment variable instead of the HTTP_COOKIE used by Apache? I've never seen COOKIE and other CGI libraries don't seem to support it.

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  • Big-O complexity of c^n + n*(logn)^2 + (10*n)^c

    - by zebraman
    I need to derive the Big-O complexity of this expression: c^n + n*(log(n))^2 + (10*n)^c where c is a constant and n is a variable. I'm pretty sure I understand how to derive the Big-O complexity of each term individually, I just don't know how the Big-O complexity changes when the terms are combined like this. Ideas? Any help would be great, thanks.

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  • Returning a struct pointer

    - by idealistikz
    Suppose I have the following struct and function returning a pointer: typedef struct { int num; void *nums; int size; } Mystruct; Mystruct *mystruct(int num, int size) { .... } I want to define any Mystruct pointer using the above function. Should I declare a Mystruct variable, define the properties of Mystruct, assign a pointer to it, and return the pointer or define the properties of a mystruct property through a pointer immediately?

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  • mysql_query -- question about results "location"

    - by Andrew Heath
    Forgive me if this is a particularly stupid question! mysql_query($query) returns a boolean, but you can also assign it to a variable $results = mysql_query($query) and then use the other mysql_ functions to extract data. Out of curiosity, how does mysq_query($query) act as both a boolean and a data container at the same time? What's happening "under the hood" during these steps? (yes, I am a n00b..., please be kind!)

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  • How to determine the browser of the user using PHP?

    - by ron8
    How to determine the browser of the user using PHP? So that if the users browser is IE then the variable $alert="onbeforeunload" and if it is not IE, for example Firefox (else) then $alert="onload. Help is much appreciated. Thanks Also please note that I can not install browscap.ini on my PHP server.

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  • Zsh command substitution

    - by Dr. Watson
    I usually work with BASH, but I'm trying to setup a cronjob from a machine and user account that is configured with zsh. When the cronjob runs, the date variable does not contain the date, just the string for the command to return the date. DATE=$(date +%Y%m%d) 55 15 * * 1-5 scp user@host:/path/to/some/file/$DATE.log /tmp I've tried using backticks rather than $() around the command, but that did not work either. Is there a special way to do command substitution in zsh?

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  • Can I view a list of public variables of some Adobe Air app or web flash file from another app?

    - by Parris
    I was thinking about creating making AIM pluggin that checks pandora one (desktop) or pandora website periodically to see what is currently playing and update a user's status. I suppose the main question is there a clever way to access a "public" variable from some open Adobe Air process? I KNOW this sounds like some crazy security flaw, but it may also be a feature. I am pretty sure javascript can potentially handle it. Thanks!

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  • How to NSZombieEnabled for debugging EXC_BAD_ACCESS on release target for an iPhone app?

    - by Bobby Moretti
    I'm developing an iPhone application. I have an EXC_BAD_ACCESS that occurs only in the release target; when I build the debug target the exception does not occur. However, when I set the NSZombieEnabled environment variable to YES, I still get the EXC_BAD_ACCESS with no further information. Is it even possible for NSZombieEnabled to work when executing the release target? I don't see why not, since gdb is running in both cases...

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  • best articles about organizing code files in C

    - by kliketa
    Can you recommend me what should I read/learn in order to make a well organized code in C? One of the things I want to learn is the principles of splitting project in .h and .c files, what goes where and why, variable naming, when to use global variables ... I am interested in books and articles that deal with this specific problem.

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  • Python: inserting double or single quotes around a string

    - by Jessy
    Im using python to access a MySQL database and im getting a unknown column in field due to quotes not being around the variable. code below: cur = x.cnx.cursor() cur.execute('insert into tempPDBcode (PDBcode) values (%s);' % (s)) rows = cur.fetchall() How do i manually insert double or single quotes around the value of s? I've trying using str() and manually concatenating quotes around s but it still doesn't work. The sql statement works fine iv double and triple check my sql query.

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  • can i quickly run entire page's text through a function on page load?

    - by korben
    i have setup a profanity filter with bad words in a XML file and have the following function to run on my page to replace the words: BadWordFilter.Instance.GetCleanString(TextBox1.Text); i'm about to go through my entire site now wrapping that function around every little text variable one by one and it's going to be a huge pain in the butt i'm hoping there's a way that i could just set my masterpage to automatically run all text through this thing on any page_load, so that the effect would be site-wide instantly. is this possible? much appreciated for any help

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