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What is the proper declaration of main?
... main that must be allowed:
int main() // (1)
int main(int, char*[]) // (2)
In (1), there are no parameters.
In (2), there are two parameters and they are conventionally named argc and argv, respectively. argv is a pointer to an array of C strings representing the arguments to...
PHP Array to CSV
...ng:
function array2csv($data, $delimiter = ',', $enclosure = '"', $escape_char = "\\")
{
$f = fopen('php://memory', 'r+');
foreach ($data as $item) {
fputcsv($f, $item, $delimiter, $enclosure, $escape_char);
}
rewind($f);
return stream_get_contents($f);
}
$list = array ...
Repeat string to certain length
... to compute the number of full repetitions needed, and the number of extra characters, all at once:
def pillmod_repeat_to_length(s, wanted):
a, b = divmod(wanted, len(s))
return s * a + s[:b]
Which is better? Let's benchmark it:
>>> import timeit
>>> timeit.repeat('sche...
Getting the encoding of a Postgres database
...
A programmatic solution:
SELECT pg_encoding_to_char(encoding) FROM pg_database WHERE datname = 'yourdb';
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What does a type followed by _t (underscore-t) represent?
... could cause some confusion. As well as size_t, the C89 standard defines wchar_t, off_t, ptrdiff_t, and probably some others I've forgotten. The C99 standard defines a lot of extra types, such as uintptr_t, intmax_t, int8_t, uint_least16_t, uint_fast32_t, and so on. These new types are formally d...
MySQL vs MongoDB 1000 reads
...s://github.com/webcaetano/mongo-mysql
10 rows
mysql insert: 1702ms
mysql select: 11ms
mongo insert: 47ms
mongo select: 12ms
100 rows
mysql insert: 8171ms
mysql select: 10ms
mongo insert: 167ms
mongo select: 60ms
1000 rows
mysql insert: 94813ms (1.58 minutes)
mysql select: 13ms
mongo inser...
How can I pad a String in Java?
...
What if you need to lpad with other chars (not spaces) ? Is it still possible with String.format ? I am not able to make it work...
– Guido
Aug 11 '09 at 15:48
...
scanf() leaves the new line char in the buffer
...ing whitespace automatically before trying to parse conversions other than characters. The character formats (primarily %c; also scan sets %[…] — and %n) are the exception; they don't skip whitespace.
Use " %c" with a leading blank to skip optional white space. Do not use a trailing blank in ...
How to escape JSON string?
... edited Jun 6 '17 at 23:57
Richard Ev
47.6k5353 gold badges179179 silver badges271271 bronze badges
answered Jan 30 '14 at 11:40
...
Replace a character at a specific index in a string?
I'm trying to replace a character at a specific index in a string.
8 Answers
8
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