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What is the difference between char * const and const char *?
...will first dereference foo to get at the array, then access the element at index i (because postfix [] binds tighter than prefix *), then dereference this element, finally yielding an int (see ideone.com/jgjIjR ). But typedef makes it easier (see ideone.com/O3wb7d ).
– gx_
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Deleting Row in SQLite in Android
...ike prepared statements in SQLite? I have used this id=? kinda syntax with PHP before and it seems very similar to that.
– GeekWithGlasses
Nov 12 '18 at 7:00
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Can I set subject/content of email using mailto:?
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Yes, look all tips and tricks with mailto: http://www.angelfire.com/dc/html-webmaster/mailto.htm
mailto subject example:
<a href="mailto:no-one@snai1mai1.com?subject=free chocolate">example</a>
mailto with cont...
Truncating floats in Python
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try:
cut_point = token_string.index('.') + n + 1
except ValueError: # no decimal in string
return token_string + '.' + '0' * n
else:
if len(token_string) < cut_poin...
Does Foreign Key improve query performance?
...t least in SQL Server, the creation of an FK does not create an associated index, and you should create indexes on all FK fields to improve look up times.
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Why are variables “i” and “j” used for counters?
...rom mathematics: the summation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ... xn, then an arbitrary one...
How to cast an Object to an int
...so use object.hashCode(), but it can be type specific.
Scenario 5: unique index
In same cases you need a unique index for each object, like to auto incremented ID values in a database table (and unlike to identity hash which is not unique). A simple sample implementation for this:
class ObjectInd...
Getting parts of a URL (Regex)
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I modified this regex to identify all parts of the URL (improved version) - code in Python ^((?P<scheme>[^:/?#]+):(?=//))?(//)?(((?P<login>[^:]+)(?::(?P<password>[^@]+)?)?@)?(?P<host>[^@/?#:]*)(?::(?P<port>\d+)?)?)?(?P<path&g...
How do I erase an element from std::vector by index?
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@Pierre because the numerical index of a particular element is not the primary model of access, iterator is. All the functions that look at elements of a container use that container's iterators. E.g. std::find_if
– Caleth
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How to process each line received as a result of grep command
...ead loop, that will be fed by the result of the grep command using the so called process substitution:
while IFS= read -r result
do
#whatever with value $result
done < <(grep "xyz" abc.txt)
This way, you don't have to store the result in a variable, but directly "inject" its output to t...