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What are forward declarations in C++?

At: http://www.learncpp.com/cpp-tutorial/19-header-files/ 8 Answers 8 ...
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How do you round a number to two decimal places in C#?

I want to do this using the Math.Round function 15 Answers 15 ...
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Start / Stop a Windows Service from a non-Administrator user account

I have a WindowsService named, say, BST. And I need to give a non-Administrator user, UserA, the permissions to Start/Stop this particular service. My service runs on a variety of Windows OS, starting from Windows Server 2003 to Windows 7. ...
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Should I instantiate instance variables on declaration or in the constructor?

Is there any advantage for either approach? 15 Answers 15 ...
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SQL Joins Vs SQL Subqueries (Performance)?

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dynamic_cast and static_cast in C++

I am quite confused with the dynamic_cast keyword in C++. 10 Answers 10 ...
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How can I shift-select multiple checkboxes like GMail?

In GMail, the user can click on one checkbox in the email list, hold down the Shift key, and select a second checkbox. The JavaScript will then select/unselect the checkboxes that are between the two checboxes. ...
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What is the difference between

Can some one please describe the usage of the following characters which is used in ERB file: 7 Answers ...
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Is there a difference between YES/NO,TRUE/FALSE and true/false in objective-c?

Simple question really; is there a difference between these values (and is there a difference between BOOL and bool)? A co-worker mentioned that they evaluate to different things in Objective-C, but when I looked at the typedefs in their respective .h files, YES/TRUE/true were all defined as 1 an...
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Why aren't pointers initialized with NULL by default?

Can someone please explain why pointers aren't initialized to NULL ? Example: 15 Answers ...