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  • How does extern work in c++?

    - by symfony
    This is from the <iostream>: namespace std { extern istream cin; ///< Linked to standard input extern ostream cout; ... It seems by using extern the data types defined in other namespaces will just be available?

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  • undefined C/C++ symbol as operator

    - by uray
    I notice that the character/symbol '`' and '@' is not used as an operator in C/C++, does anyone know the reason or historically why its so? if its really not used, is it safe to define those symbols as another operator/statement using #define?

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  • Why does Javascript's OR return a value other than true/false?

    - by Fletcher Moore
    I saw this construction in order to get the browser viewport width: function () { return window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth; } I understand the browser quirks involved. What I don't understand is why || returns the value. So I tried this alert(undefined || 0 || 3); and sure enough, it alerts 3. I find this bizarre, because I expect true or false. Could anyone explain what's going on?

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  • syntax for binding multiple variables within text

    - by danke
    When binding multiple variables value1 value2 value3 in the same text field, do I do this: text="{some text value1 other text value2 and other text value3}" or text="some text {value1} other text {value2} and other text {value3}" I noticed both work, but which is the right way to do it and will work all the time.

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  • Comment out a python code block

    - by gbarry
    Is there any mechanism to comment out large blocks of Python code? Right now the only ways I can see of commenting out code are to either start every line with a #, or to enclose the code in """ (triple quotes), except that actually makes it show up in various doc tools. Edit--After reading the answers (and referring to the "duplicate"), I have concluded the correct answer is "No". One person said so, and the rest lectured us about editors. Not a bad thing, but I feel it's important to put the answer at the top.

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  • Mysql syntax using IN help!

    - by Axel
    Hi, i have a pictures table : pictures(articleid,pictureurl) And an articles table : articles(id,title,category) So, briefly, every article has a picture, and i link pictures with article using articleid column. now i want to select 5 pictures of articles in politic category. i think that can be done using IN but i can't figure out how to do it. Note: Please only one query, because i can do it by selecting articles firstly then getting the pictures. Thanks

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  • Need help for this syntax: "#define LEDs (char *) 0x0003010"

    - by Noge
    I'm doing programming of a softcore processor, Nios II from Altera, below is the code in one of the tutorial, I manage to get the code working by testing it on the hardware (DE2 board), however, I could not understand the code. #define Switches (volatile char *) 0x0003000 #define LEDs (char *) 0x0003010 void main() { while (1) *LEDs = *Switches; } What I know about #define is that, it is either used to define a constant, or a macro, but why in the above code, there are casting like, (char *) 0x0003010, in #define? why the 2 constants, Switches and LEDs act like a variable instead of a constant? Thanks in advance !

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  • Why do I get a "warning: no newline at end of file" ?

    - by user198729
    The file is a helloworld.cpp: #include <iostream> using namespace std; int main() { if(true) cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!! return 0; } But when I build it,get a warning: g++ -Wall -O2 -c -o hw.o hw.cpp hw.cpp:8:2: warning: no newline at end of file g++ -o myprog hw.o If I add a newline at the end,the warning will go. Why is that newline at end of file recommended in a cpp source file?

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  • TextMate: Conditional formatting?

    - by Nebs
    I want to be able to color lines differently based on the starting character. eg.: - This is line 1 - This is line 2 x This is line 3 - This is line 4 x This is line 5 So lines 1,2,4 (starting with '-') should be blue while lines 3,5 (starting with 'x') should be red. Is this possible? How would you do it? Thanks.

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  • JQuery Syntax Problem?

    - by Michael Smith
    I am using JQuery to insert divs into a page but i cant seem to get the quotation marks correctly setup. For example the code below works fine: var newDiv_1 = '<div id="event_1"><b>Hello World 01</b></div>'; $('#mon_Events').append(newDiv_1); But when i try to use variable in place of the normal text, i doesnt seem to work: var eventname = 1; var newDiv_1 = '<div id="event_' . eventName . '"><b>Hello World 01</b></div>'; $('#mon_Events').append(newDiv_1); How do i use variable inside this statement?

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  • Why do some people prefer "T const&" over "const T&"?

    - by Michael Aaron Safyan
    So, I realize that const T& and T const& are identical and both mean a reference to a const T. In both cases, the reference is also constant (references cannot be reassigned, unlike pointers). I've observed, in my somewhat limited experience, that most C++ programmers use const T&, but I have come across a few people who use T const&. Is this just a personal preference? Why is one chosen over the other?

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  • Perl - getting a value from a hash where the key has a dot

    - by imerez
    I have a hash in Perl which has been dumped into from some legacy code the name of the key has now changed from simply reqHdrs to reqHdrs.bla $rec->{reqHdrs.bla} My problem is now I cant seem to access this field from the hash any ideas? The following is my error Download Script Output: Bareword "reqHdrs" not allowed while "strict subs" in use

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  • Simple question about C++ constant syntax

    - by WilliamLou
    Here is some code copied from Thinking in C++ Vol1 Chapter 10. #include <iostream> using namespace std; int x = 100; class WithStatic { static int x; static int y; public: void print() const { cout << "WithStatic::x = " << x << endl; cout << "WithStatic::y = " << y << endl; } }; what's the meaning of const for the function print()? Thanks!

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  • Which is the correct way to use PDO in PHP?

    - by Runner
    One from here: $sth->execute(array(':calories' => $calories, ':colour' => $colour)); The other from here: /*** reassign the variables again ***/ $data = array('animal_id'=>4, 'animal_name' => 'bruce'); /*** execute the prepared statement ***/ $stmt->execute($data); My question is: :key or key ? Sorry I don't have the PHP environment here.

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  • Javascript/JQuery if statement

    - by Samuurai
    This is probably pretty simple, but I can't figure out how to do it: I have this code: $.post("/admin/contract", { 'mark_paid' : true, 'id' : id }, In pseudo code, how can I do this: $.post("/admin/contract", { 'mark_paid' : true, 'id' : id, if(is_set(dont_email)) {print 'dont_email' : true} },

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  • SQL SERVER FOR XML SYNTAX

    - by Raj73
    How can I get an output as follows using FOR XML / sql query. I am not sure how I can get the Column Values as Elements instead of the tables' column Names. I am using sql server 2005 I HAVE TABLE SCEMA AS FOLLOWS CREATE TABLE PARENT ( PID INT, PNAME VARCHAR(20) ) CREATE TABLE CHILD ( PID INT, CID INT, CNAME VARCHAR(20) ) CREATE TABLE CHILDVALUE ( CID INT, CVALUE VARCHAR(20) ) INSERT INTO PARENT VALUES (1, 'SALES1') INSERT INTO PARENT VALUES (2, 'SALES2') INSERT INTO CHILD VALUES (1, 1, 'FOR01') INSERT INTO CHILD VALUES (1, 2, 'FOR02') INSERT INTO CHILD VALUES (2, 3, 'FOR03') INSERT INTO CHILD VALUES (2, 4, 'FOR04') INSERT INTO CHILDVALUE VALUES (1, '250000') INSERT INTO CHILDVALUE VALUES (2, '400000') INSERT INTO CHILDVALUE VALUES (3, '500000') INSERT INTO CHILDVALUE VALUES (4, '800000') The Output I am looking for is as follows <SALE1> <FOR01>250000</FOR01> <FOR02>400000</FOR02> </SALE1> <SALE2> <FOR03>500000</FOR03> <FOR04>800000</FOR04> </SALE2>

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