Math operation in Java
- by joroj
Hello, what "^" operator does?
when I try this:
int a = 5^n;
it gives me:
for n = 5, returns 0
for n = 4, returns 1
for n = 6, returns 3
What is this?
Search Results
Search found 2498 results on 100 pages for 'unary operator'.
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How to implement == or >= operators for generic type
- by momsd
I have a generic type Foo which has a internal generic class Boo. Boo class a property Value of type K. In a method inside Foo i want to do a boo.Value >= value Note that second operand value is of type T. while compiling i am getting following error: Operator '=' cannot be applied to operands of type 'T' and 'T' Can anyone please tell me whats the problem here?Read the article
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LINQ Single vs First
- by BahaiResearch.com
LINQ: Is it more efficient to use the Single() operator over First() when ever I know for certain that the query will return a single record? Is there a difference?Read the article
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What is the best way to open a URL and get up to X bytes in Python?
- by Stavros Korokithakis
I want to have a robot fetch a URL every hour, but if the site's operator is malicious he could have his server send me a 1 GB file. Is there a good way to limit downloading to, say, 100 KB and stop after that limit? I can imagine writing my own connection handler from scratch, but I'd like to use urllib2 if at all possible, just specifying the limit somehow. Thanks!Read the article
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K/APL style programming in C++?
- by anon
I'm writing code in C++, but I really like K/APL's array-oriented style. Does anyone know of a good set of operator overloading tricks / macros / ... to allow some K/APL -style programming in C++? Thanks!Read the article
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Is there a way to combine IN and LIKE in MySQL?
- by abeger
I'm currently running a query like this: SELECT * FROM email WHERE email_address LIKE 'ajones@%' OR email_address LIKE 'bsmith@%' OR email_address LIKE 'cjohnson@%' The large number of OR's bothers me. Is there a way to condense this up with something akin to an IN operator, e.g.: SELECT * FROM email WHERE email_address LIKE ('ajones@%', 'bsmith@%', 'cjohnson@%') Or is this just wishful thinking?Read the article
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Javascript date comparison
- by Art
Why does equality operator return false in the first case? var a = new Date(2010, 10, 10); var b = new Date(2010, 10, 10); alert(a == b); // <- returns false alert(a.getTime() == b.getTime()); // returns true Why?Read the article
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LINQ expression until to break a string
- by wonea
Using LINQ I'm looking to break down the following path string[], however I'd like to break it up to the point of the Binn folder. Is there a WHERE UNTIL operator in LINQ? c:\ Program Files\ Microsoft SQL Server\ MSSQL10.SQLEXPRESS\ MSSQL\ Binn\ sqlservr.exe What I'd like todo var words = from word in thepath where UNTIL thepath == "Binn" select word;Read the article
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Size of abstract class
- by webgenius
How can I find the size of an abstract class? class A { virtual void PureVirtualFunction() = 0; }; Since this is an abstract class, I can't create objects of this class. How will I be able to find the size of the abstract class A using the 'sizeof' operator?Read the article
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Can I use "map" as a substitute for "for each"/"for in"?
- by John Mee
For a little while now javascript has the "map" function to loop over arrays. It appears possible to use it as a 'foreach' operator for example: var arr = ['a','b','c'] var doubles = arr.map(function(val){ return val + val }) Is this better or worse than saying for(var i in arr){ ... 50/50: saves having to use the index but adds a callback; it doesn't seem very common so I hesitate to use it but still want to.Read the article
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How to process this string via regular expression
- by iiduce
my string style like this: expression1/field1+expression2*expression3+expression4/field2*expression5*expression6/field3 a real style mybe like this: computer/(100)+web*mail+explorer/(200)*bbs*solution/(300) "+" and "*" represent operator "computer","web"...represent expression (100),(200) represent field num . field num may not exist. I want process the string to this: /(100)+web*+explorer/(200)bbs/(300) rules like this: if expression length is more than 3 and its field is not (200), then add brackets to it.Read the article
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Which is clearer form: if(!value) or if(flag == value) ?
- by CodexArcanum
I understand this is a subjective question, so I apologize if it needs to be closed, but I feel like it comes up often enough for me to wonder if there is a general preference for one form over the other. Obviously, the best answer is "refactor the code so you don't need to test for falsehood" but sometimes there's no easy way to do so and the "else" branch is simply to continue processing. So when you must have an "if not false" construct, which is the preferred standard: The not operator if(!value) Or the test for false if(value == false)Read the article
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Problem with computed column with NDBUnit
- by jess
Hi, I am loading data for tests in tables using xml and ndbunit.But,for a table having computed column,I am having problem.I get this error The column "xyz" cannot be modified because it is either a computed column or is the result of a UNION operator. I have modified the INSERT and UPDATE commands(removed the computed column) of sqladapter in xsd file,but still face the issue. thanksRead the article
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why inner class doesn't compile..?
- by Vincenzo
This is my code: #include <algorithm> class A { void f() { struct CompareMe { bool operator() (int i, int j) { return i < j; } } comp; int a[] = {1, 2, 3, 4}; int found = std::min_element(a[0], a[3], comp); } } Error message: no matching function for call to ‘min_element(int&, int&, A::f()::CompareMe&) What am I doing wrong?Read the article
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Why do I need an intermediate conversion to go from struct to decimal, but not struct to int?
- by Jesse McGrew
I have a struct like this, with an explicit conversion to float: struct TwFix32 { public static explicit operator float(TwFix32 x) { ... } } I can convert a TwFix32 to int with a single explicit cast: (int)fix32 But to convert it to decimal, I have to use two casts: (decimal)(float)fix32 There is no implicit conversion from float to either int or decimal. Why does the compiler let me omit the intermediate cast to float when I'm going to int, but not when I'm going to decimal?Read the article
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[game] How to write ::: in cpp and ??? in c#?
- by daveny
These questions are a kind of game, and I did not find the solution for them. It is possible to write ::: in Cpp without using "" or anything like this and the compiler will accept it. (macro-s are prohibited too) And the same is true for C# too, but in C#, you have to write ???. I think Cpp will use the :: scope operator and C# will use '? :' , but I do not know the answers to them. Any idea?Read the article
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How can an object not be compared to null?
- by ProfK
I have an 'optional' parameter on a method that is a KeyValuePair. I wanted an overload that passes null to the core method for this parameter, but in the core method, when I want to check if the KeyValuePair is null, I get the following error: Operator '!=' cannot be applied to operands of type System.Collections.Generic.KeyValuePair<string,object>' and '<null>. How can I not be allowed to check if an object is null?Read the article
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c#: adding two strings
- by every_answer_gets_a_point
i am doing: html = new WebClient().DownloadString("http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=" + biocompany); and i am getting the error: Error 1 Operator '&' cannot be applied to operands of type 'string' and 'string' but i am not even using the & ! please help!Read the article
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problem with intersect operation in a sql query
- by Shadi
I wrote the following query, I think it's correct but I have a "missing operator" error. SELECT * FROM results,Types WHERE results.a=Types.b INTERSECT SELECT * FROM results,Types WHERE results.c=Types.b Could somebody help me please? Thanks a lot.Read the article
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What are the most interesting/useful new things in Perl 5.12?
- by hillu
I remember quickly adopting given .. when, say, //, and the smart matching operator when Perl 5.10 came around. What do you consider the most useful fixes and features introduced with Perl 5.12.0?Read the article
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[UNIX] Is it safe to pipe the output of several parallel processes to one file using >> ?
- by conradlee
I'm scraping data from the web, and I have several processes of my scraper running in parallel. I want the output of each of these processes to end up in the same file. As long as lines of text remain intact, I the order of the lines does not matter. In UNIX, can I just pipe the output of each process to the same file using the operator?Read the article
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How is it possible to legally write ::: in C++ and ??? in C#?
- by daveny
These questions are a kind of game, and I did not find the solution for them. It is possible to write ::: in C++ without using quotes or anything like this and the compiler will accept it (macros are prohibited too). And the same is true for C# too, but in C#, you have to write ???. I think C++ will use the :: scope operator and C# will use ? : , but I do not know the answers to them. Any idea?Read the article
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what does this C++ macro do ?
- by fadini
THis is for MSVC #define Get64B(hi, lo) ((((__int64)(hi)) << 32) | (unsigned int)(lo)) Specifically, what is the role of the 'operator <<' ? Thanks for your helpRead the article
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Problem with receiving data form serial port in c#?
- by moon
hello i have problem with receiving data from serial port in c# in am inserting a new line operator at the end of data buffer. then i send this data buffer on serial port, after this my c# GUI receiver will take this data via Readline() function but it always give me raw data not the actual one how to resolve this problem.Read the article
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In C#, how do I check if a type is a subtype OR the type of an object?
- by Daniel T.
To check if a type is a subclass of another type in C#, it's easy: typeof (SubClass).IsSubclassOf(BaseClass); // returns true However, this will fail: typeof (BaseClass).IsSubclassOf(BaseClass); // returns false Is there any way to check whether a type is either a subclass OR of the base class itself, without using an OR operator or using an extension method?Read the article
