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Scala how can I count the number of occurrences in a list
I want to implement it like this: list.count(2) (returns 3).
16 Answers
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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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Telling gcc directly to link a library statically
It feels strange to me to use -Wl,-Bstatic in order to tell gcc which libraries I want to link with statically. After all I'm telling gcc directly all other information about linking with libraries ( -Ldir , -llibname ).
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Repeat command automatically in Linux
Is it possible in Linux command line to have a command repeat every n seconds?
13 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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What is the argument for printf that formats a long?
...h as %d or %i for a signed int . However, I don't see anything for a long value.
7 Answers
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conflicting types for \'dev_t\'的原因 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...题，这貌似是一个Linux历史遗留问题:
/usr/include/sys/types.h:62: error: conflicting types for ‘dev_t’
/usr/include/linux/types.h:13: error: previous declaration of ‘dev_t’ was here
/usr/include/sys/types.h:67: error: conflicting types for ‘gid_t’...
commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
Sometimes, when using <h:commandLink> , <h:commandButton> or <f:ajax> , the action , actionListener or listener method associated with the tag are simply not being invoked. Or, the bean properties are not updated with submitted UIInput values.
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Way to get number of digits in an int?
Is there a neater way for getting the length of an int than this method?
30 Answers
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C/C++ include header file order
What order should include files be specified, i.e. what are the reasons for including one header before another?
10 Answers...