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What is the printf format specifier for bool?
...r, since any integral type shorter than int is promoted to int when passed down to printf()'s variadic arguments, you can use %d:
bool x = true;
printf("%d\n", x); // prints 1
But why not:
printf(x ? "true" : "false");
or, better:
printf("%s", x ? "true" : "false");
or, even better:
fputs(...
How can I create an object and add attributes to it?
...to hold properties. Leaves code more readable b/c when I see lambda I slow down my reading to 25% while your way makes total sense! Thanks.
– Marc
Oct 14 '16 at 0:31
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Quit and restart a clean R session from within R?
... .GlobalEnv)
Then entering this into the R console:
refresh
will shut down the current session and start up a new one.
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Global variables in Java
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Down vote for saying, "don't do it." without explaining or referring to an explanation of why.
– Jeff McCune
Jun 10 '15 at 23:08
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socket.error: [Errno 48] Address already in use
...ll sends a signal to the process, which it can decide to handle (like shut down gracefully or rotate a logfile). These signals are integers (each with a name), the default being 15, meaning TERM or terminate. Using -9 sends signal 9, KILL, which a process can't catch and ignore, and the OS will end ...
MySQL > Table doesn't exist. But it does (or it should)
... fixed the same issue for me as well. Mine happened after my machine shut down due to a sudden power loss. After the first machine restart/MySQL startup, I got the error. Then, I read this answer. I stopped/started MySQL through System Preferences and it was fixed.
– Jeff E...
Make xargs handle filenames that contain spaces
...pace characters (tabs, spaces, new lines) as delimiters.
You can narrow it down only for the new line characters ('\n') with -d option like this:
ls *.mp3 | xargs -d '\n' mplayer
It works only with GNU xargs.
For BSD systems, use the -0 option like this:
ls *.mp3 | xargs -0 mplayer
This method is ...
Limiting floats to two decimal points
...ch is closest to 0.245 is slightly less than 0.245, so naturally it rounds down. Likewise, there is no such thing as 0.225 in binary, but the binary value which is closest to 0.225 is slightly greater than 0.225, so naturally it rounds up.
– John Y
Jun 14 '16 a...
Remove all files except some from a directory
...exclude these" | xargs rm -r works much faster as it doesn't need to drill down in to directories unnecessarily.
– billynoah
Jan 17 '14 at 19:25
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What is the use of making constructor private in a class?
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No one is going to read this, but here goes: I've been downvoted a couple of times on this one. Not upset or anything, but (for the sake of learning) I'd like to know why this is bad? How else could an iterator be constructed with the data it needs to access a container's data?
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