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Should I learn C before learning C++? [closed]
I visited a university CS department open day today and in the labs tour we sat down to play with a couple of final-year projects from undergraduate students. One was particularly good - a sort of FPS asteroids game. I decided to take a peek in the src directory to find it was done in C++ (most of...
getApplication() vs. getApplicationContext()
I couldn't find a satisfying answer to this, so here we go: what's the deal with Activity/Service.getApplication() and Context.getApplicationContext() ?
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What are MVP and MVC and what is the difference?
When looking beyond the RAD (drag-drop and configure) way of building user interfaces that many tools encourage you are likely to come across three design patterns called Model-View-Controller , Model-View-Presenter and Model-View-ViewModel . My question has three parts to it:
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How do I create a unique constraint that also allows nulls?
I want to have a unique constraint on a column which I am going to populate with GUIDs. However, my data contains null values for this columns. How do I create the constraint that allows multiple null values?
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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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What's the difference between %s and %d in Python string formatting?
I don't understand what %s and %d do and how they work.
12 Answers
12
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.NET unique object identifier
Is there a way of getting a unique identifier of an instance?
11 Answers
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Why can't yield return appear inside a try block with a catch?
The following is okay:
4 Answers
4
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Can a variable number of arguments be passed to a function?
In a similar way to using varargs in C or C++:
6 Answers
6
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linux上SVN conflict冲突解决的办法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...改了同一个文件的相同位置？Bing！冲突来了。
工程师A修改了a.txt的第一行，提交了。
工程师B也修改了a.txt的第一行，然后执行svn up，这时SVN提示了：（以下，你开始扮演工程师B的角色了）
$ svn up
在 “a.txt” 中发现冲突...