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What are the barriers to understanding pointers and what can be done to overcome them? [closed]
Why are pointers such a leading factor of confusion for many new, and even old, college level students in C or C++? Are there any tools or thought processes that helped you understand how pointers work at the variable, function, and beyond level?
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Generate all permutations of a list without adjacent equal elements
When we sort a list, like
12 Answers
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Adding a column to a data.frame
I have the data.frame below. I want to add a column that classifies my data according to column 1 ( h_no ) in that way that the first series of h_no 1,2,3,4 is class 1, the second series of h_no (1 to 7) is class 2 etc. such as indicated in the last column.
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Most efficient conversion of ResultSet to JSON?
The following code converts a ResultSet to a JSON string using JSONArray and JSONObject .
14 Answers
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NerdTree - Reveal file in tree
Is there a shortcut which reveal the current file in the NerdTree directory panel.
5 Answers
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What do the result codes in SVN mean?
What do the result codes in SVN mean? I need a quick reference.
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Why do I get a segmentation fault when writing to a “char *s” initialized with a string literal, but
The following code receives seg fault on line 2:
17 Answers
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Grouping functions (tapply, by, aggregate) and the *apply family
Whenever I want to do something "map"py in R, I usually try to use a function in the apply family.
10 Answers
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How do exceptions work (behind the scenes) in c++
I keep seeing people say that exceptions are slow, but I never see any proof. So, instead of asking if they are, I will ask how do exceptions work behind the scenes, so I can make decisions of when to use them and whether they are slow.
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Postgres DB Size Command
What is the command to find the size of all the databases?
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