大约有 40,000 项符合查询结果（耗时：0.0292秒） [XML]
What is the maximum possible length of a .NET string?
...cientific and accurate experiment, it tops out on my machine well before 1,000,000,000 characters. (I'm still running the code below to get a better pinpoint).
UPDATE:
After a few hours, I've given up. Final results: Can go a lot bigger than 100,000,000 characters, instantly given System.OutOfMemor...
Minimum and maximum date
...Javascript Date object. I found that the minimum date is something like 200000 B.C., but I couldn't get any reference about it.
...
What characters are valid for JavaScript variable names?
...
1000
+50
To quot...
How to iterate for loop in reverse order in swift?
...an array with one trillion Ints!
Test:
var count = 0
for i in lazy(1...1_000_000_000_000).reverse() {
if ++count > 5 {
break
}
println(i)
}
For Swift 2.0 in Xcode 7:
for i in (1...10).reverse() {
print(i)
}
Note that in Swift 2.0, (1...1_000_000_000_000).reverse()...
How to return only the Date from a SQL Server DateTime datatype
...EADD(dd, 0, DATEDIFF(dd, 0, GETDATE()))
gives me
2008-09-22 00:00:00.000
Pros:
No varchar<->datetime conversions required
No need to think about locale
As suggested by Michael
Use this variant: SELECT DATEADD(dd, DATEDIFF(dd, 0, getdate()), 0)
select getdate()
SELECT DATEADD(...
Extracting bits with a single multiplication
...igned 8 bit for simplicity. Imagine your number is xxaxxbxx and you want ab000000.
The solution consisted of two steps: a bit masking, followed by multiplication. The bit mask is a simple AND operation that turns uninteresting bits to zeros. In the above case, your mask would be 00100100 and the re...
How does database indexing work? [closed]
...
Example 1 - sorted vs unsorted fields
Given our sample database of r = 5,000,000 records of a fixed size giving a record length of R = 204 bytes and they are stored in a table using the MyISAM engine which is using the default block size B = 1,024 bytes. The blocking factor of the table would be b...
How do I change the root directory of an apache server? [closed]
...che's root directory, run: cd /etc/apache2/sites-available. Then open the 000-default.conf file using the command: nano 000-default.conf. Edit the DocumentRoot option: DocumentRoot /path/to/my/project. (see askubuntu.com/questions/337874/…)
– sea26.2
Oct 4 ...
How to remove the first character of string in PHP?
...;
// $str[0] = null;
// replaced by �, but ok for echo
Exec time for 1.000.000 tests : 0.39602184295654 sec
Remove the first letter with substr()
$str = "hello";
$str = substr($str, 1);
Exec time for 1.000.000 tests : 5.153294801712 sec
Remove the first letter with ltrim()
$str = "hell...
Can I use assert on Android devices?
...is generated is (for Android 2.3.3):
// Static constructor for the class
000318: |[000318] com.example.asserttest.AssertActivity.:()V
000328: 1c00 0300 |0000: const-class v0, Lcom/example/asserttest/AssertActivity; // class@0003
0...