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How can I multiply and divide using only bit shifting and adding?
...y in terms of adding and shifting you want to decompose one of the numbers by powers of two, like so:
21 * 5 = 10101_2 * 101_2 (Initial step)
= 10101_2 * (1 * 2^2 + 0 * 2^1 + 1 * 2^0)
= 10101_2 * 2^2 + 10101_2 * 2^0
= 10101_2 << 2 + 10101_2 << 0 (De...
Windows git “warning: LF will be replaced by CRLF”, is that warning tail backward?
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warning: LF will be replaced by CRLF.
Depending on the editor you are using, a text file with LF wouldn't necessary be saved with CRLF: recent editors can preserve eol style. But that git config setting insists on changing those...
Simply make sure t...
Are there any downsides to passing structs by value in C, rather than passing a pointer?
Are there any downsides to passing structs by value in C, rather than passing a pointer?
10 Answers
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WebDriver: check if an element exists? [duplicate]
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You could alternatively do:
driver.findElements( By.id("...") ).size() != 0
Which saves the nasty try/catch
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Group by multiple columns in dplyr, using string vector input
...r my understanding of plyr into dplyr, but I can't figure out how to group by multiple columns.
9 Answers
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How to select an option from drop down using Selenium WebDriver C#?
...ort.UI;
// select the drop down list
var education = driver.FindElement(By.Name("education"));
//create select element object
var selectElement = new SelectElement(education);
//select by value
selectElement.SelectByValue("Jr.High");
// select by text
selectElement.SelectByText("HighScho...
How do I pass a variable by reference?
The Python documentation seems unclear about whether parameters are passed by reference or value, and the following code produces the unchanged value 'Original'
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Count number of records returned by group by
How do I count the number of records returned by a group by query,
13 Answers
13
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How to make shallow git submodules?
...le on "submodule update can handle symbolic links in pwd".
Signed-off-by: Fredrik Gustafsson <iveqy@iveqy.com>
Acked-by: Jens Lehmann <Jens.Lehmann@web.de>
That means this works:
git submodule add --depth 1 -- repository path
git submodule update --depth -- [<path>...]
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How are strings passed in .NET?
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A reference is passed; however, it's not technically passed by reference. This is a subtle, but very important distinction. Consider the following code:
void DoSomething(string strLocal)
{
strLocal = "local";
}
void Main()
{
string strMain = "main";
DoSomething(strMain);
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