大约有 40,000 项符合查询结果（耗时：0.0584秒） [XML]
How does the C code that prints from 1 to 1000 without loops or conditional statements work?
I've found C code that prints from 1 to 1000 without loops or conditionals :
But I don't understand how it works. Can anyone go through the code and explain each line?
...
JavaScript: Passing parameters to a callback function
I'm trying to pass some parameter to a function used as callback, how can I do that?
13 Answers
...
PHP Function with Optional Parameters
...gt; $param2
);
function func($required, $requiredTwo, $optional) {
if(isset($optional["param2"])) {
doWork();
}
}
share
|
improve this answer
|
follow
...
How can I iterate over an enum?
...
The typical way is as follows:
enum Foo {
One,
Two,
Three,
Last
};
for ( int fooInt = One; fooInt != Last; fooInt++ )
{
Foo foo = static_cast<Foo>(fooInt);
// ...
}
Please note, the enum Last is meant to be skipped by the i...
Should a return statement be inside or outside a lock?
...
Essentially, which-ever makes the code simpler. Single point of exit is a nice ideal, but I wouldn't bend the code out of shape just to achieve it... And if the alternative is declaring a local variable (outside the lock), initializing it (inside the lock) and then returning it (outside...
Passing properties by reference in C#
...test");
}
2. Delegate
void GetString(string input, Action<string> setOutput)
{
if (!string.IsNullOrEmpty(input))
{
setOutput(input);
}
}
void Main()
{
var person = new Person();
GetString("test", value => person.Name = value);
Debug.Assert(person.Name == ...
MySQL - Rows to Columns
...fy. We're just going to replace any null values with zeroes so the result set is nicer to look at:
create view history_itemvalue_pivot_pretty as (
select
hostid,
coalesce(A, 0) as A,
coalesce(B, 0) as B,
coalesce(C, 0) as C
from history_itemvalue_pivot
);
select * from h...
Exporting data In SQL Server as INSERT INTO
...or a single or all tables, and one of the options is "Script Data". If you set that to TRUE, the wizard will generate a script with INSERT INTO () statement for your data.
If using 2008 R2 or 2012 it is called something else, see screenshot below this one
2008 R2 or later eg 2012
Select "Type...
How to change the type of a field?
...b.coll.find().forEach(function(data) {
db.coll.update({_id:data._id},{$set:{myfield:parseInt(data.myfield)}});
})
share
|
improve this answer
|
follow
|
...
How are virtual functions and vtable implemented?
We all know what virtual functions are in C++, but how are they implemented at a deep level?
12 Answers
...