大约有 17,000 项符合查询结果（耗时：0.0380秒） [XML]
Code Golf - π day
...
Perl, 95 96 99 106 109 110 119 characters:
$t+=$;=1|2*sqrt($r**2-($u-2*$_)**2),say$"x($r-$;/2).'*'x$;for 0..
($u=($r=<>)-1|1);say$t*2/$r**2
(The newline can be removed and is only there to avoid a scrollbar)
Yay! Circle version!
$t+=$;=
1|2*sqrt($r**
2-($u-2*$_)**2)
,say$"x($r-$;/2
)....
Determine whether an array contains a value [duplicate]
... the most efficient method of accomplishing a utility function like this.
_.includes([1, 2, 3], 3); // returns true
If you're concerned about the bulk that's being added to your application by including the whole library, know that you can include functionality separately:
var includes = require...
Verify version of rabbitmq
...n Windows this is very similar. "C:\Program Files\RabbitMQ Server\rabbitmq_server-3.6.5\sbin\rabbitmqctl status" Folder name may vary with your version of Rabbit.
– dylanT
Nov 10 '16 at 23:58
...
onCreateOptionsMenu inside Fragments
...nsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_sample, menu);
super.onCreateOptionsMenu(menu,inflater);
}
And in onCreate add this line to make the options appear in your Toolbar
setHasOptionsMenu(true);
...
Get real path from URI, Android KitKat new storage access framework [duplicate]
... obtain document id, and then query either MediaStore.Images.Media.EXTERNAL_CONTENT_URI or MediaStore.Images.Media.INTERNAL_CONTENT_URI (depending on the SD card situation).
To get document id:
// Will return "image:x*"
String wholeID = DocumentsContract.getDocumentId(uriThatYouCurrentlyHave);
//...
What is the difference between #import and #include in Objective-C?
...tions asked.
So if you have a file a.h with this contents:
typedef int my_number;
and a file b.c with this content:
#include "a.h"
#include "a.h"
the file b.c will be translated by the preprocessor before compilation to
typedef int my_number;
typedef int my_number;
which will result in a c...
sizeof single struct member in C
...ic way to do it, another would be to use a macro like this:
#define member_size(type, member) sizeof(((type *)0)->member)
and use it like this:
typedef struct
{
float calc;
char text[255];
int used;
} Parent;
typedef struct
{
char flag;
char text[member_size(Parent, text)...
Get the value of an instance variable given its name
...
The most idiomatic way to achieve this is:
some_object.instance_variable_get("@#{name}")
There is no need to use + or intern; Ruby will handle this just fine. However, if you find yourself reaching into another object and pulling out its ivar, there's a reasonably good ...
Can someone explain Microsoft Unity?
...object gets created.
Without IoC:
public class MyClass
{
IMyService _myService;
public MyClass()
{
_myService = new SomeConcreteService();
}
}
With IoC container:
public class MyClass
{
IMyService _myService;
public MyClass(IMyService myService)
{
_myS...
python list in sql query as parameter
... cursor.execute(f'SELECT name FROM students WHERE id IN ({','.join('?' for _ in l)})', l). @bobince, you should also remark in your solution that using ? is the safe way to go in terms of avoid SQL injection. There are a lot of answers here that are vulnerable, basically any that concatenates string...