大约有 32,000 项符合查询结果（耗时：0.0531秒） [XML]
Why does changing the sum order returns a different result?
...icant digits, where each addition is performed at "infinite" precision and then rounded to the nearest representable number. Here are two sums:
1/3 + 2/3 + 2/3 = (0.3333 + 0.6667) + 0.6667
= 1.000 + 0.6667 (no rounding needed!)
= 1.667 (where 1.6667 is rounded to 1.6...
Prompt for user input in PowerShell
... is, [Parameter(Mandatory = $true, HelpMessage = 'New User Credentials')]) then it will become help text for the prompt.
share
|
improve this answer
|
follow
|...
Validate that a string is a positive integer
...we needed to allow 0).
If you want to allow leading zeroes (0123, 00524), then just replace the alternation (?:0|[1-9]\d*) with \d+
function isNormalInteger(str) {
return /^\+?\d+$/.test(str);
}
If you want to allow whitespace, add \s* just after ^ and \s* just before $.
Note for when you c...
Add Foreign Key to existing table
...ds need to match. So if your primary key in the lookup table is UNSIGNED, then the foreign key field must also be UNSIGNED. If the primary key field is SIGNED, then foreign key field must also be signed. Think of it this way: whatever the column in the one table is defined as in a SHOW CREATE TAB...
how to access iFrame parent page using jquery?
...ne, but don't load it one task. Also, people seem concerned about JS perf, then use an API on top of JS to do things easily possible (and possibly faster) without the API.
– Grant Wagner
Apr 7 '09 at 18:26
...
Java SafeVarargs annotation, does a standard or best practice exist?
... part of a class Foo<T>, and you have a Foo<String> reference, then calling foo on it would be okay because we know T is String at that point in the code.
However, it does not work when the "value" of T is another type parameter. In Java, it is impossible to create an array of a type-pa...
Creating JS object with Object.create(null)?
...e using an object as a map, and you create an object using method 1 above, then you have to be extra careful when doing lookups in the map. Because the properties and methods from Object are inherited, your code may run into a case where there are keys in the map that you never inserted. For example...
Can local storage ever be considered secure? [closed]
...control the execution environment. So you install the Stanford Crypto lib. Then what happens if some browser plugin overrides sjcl.encrypt to email the key to the attacker? In JS that's 100% possible and there's nothing you can do to stop it. And that's the underlying point. There are no "security" ...
git remove merge commit from history
...
Yeah, then you delete them in the editor that comes up with git rebase and they will be removed.
– Schleis
Jul 10 '13 at 18:17
...
Android file chooser [closed]
...anager.",
Toast.LENGTH_SHORT).show();
}
}
You would then listen for the selected file's Uri in onActivityResult() like so:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case FILE_SELECT_CODE:
...