大约有 30,000 项符合查询结果（耗时：0.0296秒） [XML]
Passing references to pointers in C++
...nst& val)
{
// Do stuff to the string pointer
}
int main()
// sometime later
{
// ...
string s;
string* ps = &s;
myfunc( ps); // OK because ps is not a temporary
myfunc2( &s); // OK because the parameter is a const&
// ...
return 0;
}
...
Correctly determine if date string is a valid date in that format
...
You can use DateTime class for this purpose:
function validateDate($date, $format = 'Y-m-d')
{
$d = DateTime::createFromFormat($format, $date);
// The Y ( 4 digits year ) returns TRUE for any integer with any number of digits so cha...
Easily measure elapsed time
I am trying to use time() to measure various points of my program.
26 Answers
26
...
How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
... extra overhead since it isn't stored as an array but that in terms of run time (assuming the longest key is the longest english word) it can be essentially O(1) (in relation to the upper bound). Maybe the longest english word is 50 characters?
...
How to find all occurrences of a substring?
...
What will be the time complexity of using this method ?
– Pranjal Mittal
Jul 13 '17 at 23:50
2
...
convert '1' to '0001' in JavaScript [duplicate]
...out using any 3rd party libraries. I have done this in php using spritf: $time = sprintf('%04.0f',$time_arr[$i]);
4 Answer...
Does Python's time.time() return the local or UTC timestamp?
Does time.time() in the Python time module return the system's time or the time in UTC?
8 Answers
...
TypeError: not all arguments converted during string formatting python
... 461: % formatting for bytes. This makes me think the % remains for a long time to come.
– cfi
Jan 7 '16 at 16:03
7
...
Does ruby have real multithreading?
...Programming Language and a particular Ruby Implementation.
It is also sometimes called "MRI" (for "Matz's Ruby
Implementation"), CRuby or MatzRuby.
MRI implements Ruby Threads as Green Threads within its
interpreter. Unfortunately, it doesn't allow those threads
to be scheduled in parallel, the...
How can I round down a number in Javascript?
... S for checking my work.
Here's the code I used to test:
var a = [];
var time = new Date().getTime();
for( i = 0; i < 100000; i++ ) {
//a.push( Math.random() * 100000 | 0 );
a.push( Math.floor( Math.random() * 100000 ) );
}
var elapsed = new Date().getTime() - time;
alert( "elapsed tim...