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Why do most C developers use define instead of const? [duplicate]
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@C. Ross: Consistency. All manifest constants are usually defined with #defines. const is only used to indicate a read-only (access path to a) variable. I know, const in C is just plain broken :-)
– Bart van Ingen Schenau
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How do you write multiline strings in Go?
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According to the language specification you can use a raw string literal, where the string is delimited by backticks instead of double quotes.
`line 1
line 2
line 3`
share
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SQL how to increase or decrease one for a int column in one command
...wer the second:
There are several ways to do this. Since you did not specify a database, I will assume MySQL.
INSERT INTO table SET x=1, y=2 ON DUPLICATE KEY UPDATE x=x+1, y=y+2
REPLACE INTO table SET x=1, y=2
They both can handle your question. However, the first syntax allows for more flexi...
delete_all vs destroy_all?
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You are right. If you want to delete the User and all associated objects -> destroy_all
However, if you just want to delete the User without suppressing all associated objects -> delete_all
According to this post : Rails :dependent =...
Set operations (union, intersection) on Swift array?
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Yes, Swift has the Set class.
let array1 = ["a", "b", "c"]
let array2 = ["a", "b", "d"]
let set1:Set<String> = Set(array1)
let set2:Set<String> = Set(array2)
Swift 3.0+ can do operations on sets as:
firstSet.union(s...
How to get the browser viewport dimensions?
...which jQuery calls the browser viewport
available cross-browser
inaccurate if doctype is missing
Resources
Live outputs for various dimensions
verge uses cross-browser viewport techniques
actual uses matchMedia to obtain precise dimensions in any unit
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How to quit a java app from within the program
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The "0" lets whomever called your program know that everything went OK. If, however, you are quitting due to an error, you should System.exit(1);, or with another non-zero number corresponding to the specific error.
Also, as others have mentioned, clean up first! That involves closing files and ...
round() doesn't seem to be rounding properly
...to blame here -- "5.665 -> 5.67" but "15.665 -> 15.66". Use decimals if you need exact precision.
– Jimmy
Jul 15 '15 at 22:42
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Is there a way to measure how sorted a list is?
...Wikipedia:
Formally, let A(1), A(2), ..., A(n) be a sequence of n numbers.If i < j and A(i) > A(j), then the pair (i,j) is called an inversion of A.
The inversion number of a sequence is one common measure of its sortedness.Formally, the inversion number is defined to be the number of inversi...
Can I underline text in an Android layout?
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It can be achieved if you are using a string resource xml file, which supports HTML tags like <b></b>, <i></i> and <u></u>.
<resources>
<string name="your_string_here">This is an <u>und...