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Redefining NULL
... trick is to hack the compiler so that pointer<->integer conversions XOR a specific value that is an invalid pointer and still trivial enough that the target architecture can do that cheaply (usually, that would be a value with a single bit set, such as 0x20000000).
– Sim...
How to read data when some numbers contain commas as thousand separator?
... Bureau.Name Account.Code X2014 X2015 X2016
1 Senate 110 158,000 211,000 186,000
2 Senate 115 0 0 0
3 Senate 123 15,000 71,000 21,000
4 Senate 126 6,000 14,000 8,000
5 Senate 127 110,000 234,0...
How to find if a given key exists in a C++ std::map
...tion != 0), so you can just use if(m.count(key))
– jv110
Dec 16 '16 at 20:50
7
@jv110 The Microso...
Remove non-utf8 characters from string
...s 0xxxxxxx
| [\xC0-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
| [\xE0-\xEF][\x80-\xBF]{2} # triple-byte sequences 1110xxxx 10xxxxxx * 2
| [\xF0-\xF7][\x80-\xBF]{3} # quadruple-byte sequence 11110xxx 10xxxxxx * 3
){1,100} # ...
How can I make the computer beep in C#?
... information refer http://msdn.microsoft.com/en-us/library/8hftfeyw%28v=vs.110%29.aspx
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How can I get the latest JRE / JDK as a zip file rather than EXE or MSI installer? [closed]
...
If you want the src.zip, then you should also "extrac32 110" in .rsrc/JAVA_CAB9, and copy that to the root of your resulting JDK directory.
– Chris Noe
Jul 17 '13 at 16:15
...
Only read selected columns
...), 3)
mpg cyl disp hp drat wt qsec vs am gear carb
1 21 6 160 110 3.9 2.62 16.46 0 1 4 4
2 21 6 160 110 3.9 2.875 17.02 0 1 4 4
3 22.8 4 108 93 3.85 2.32 18.61 1 1 4 1
> head(dbGetQuery(conn, "select mpg, gear from mtcars"), 3)
MPG GEAR
1 21...
Why do people say there is modulo bias when using a random number generator?
...8 possible outcomes:
000 = 0, 001 = 1, 010 = 2, 011 = 3
100 = 4, 101 = 5, 110 = 6, 111 = 7
We can reduce the size of the outcome set to exactly 6 by taking the value modulo 6, however this presents the modulo bias problem: 110 yields a 0, and 111 yields a 1. This die is loaded.
Potential Solutio...
How accurately should I store latitude and longitude?
...So let's talk about the equator, where the distance between each degree is 110.574km for latitude and 111.320km for longitude.
50ft is 0.01524km, so:
0.01524 / 110.574 = 1/7255 of a degree of latitude
0.01524 / 111.320 = 1/7304 of a degree of longitude
You need four digits of scale, enough to g...
hash function for string
...ay to do that is to rotate the current result by some number of bits, then XOR the current hash code with the current byte. Repeat until you reach the end of the string. Note that you generally do not want the rotation to be an even multiple of the byte size either.
For example, assuming the common...