大约有 16,000 项符合查询结果（耗时：0.0304秒） [XML]
How do I assign an alias to a function name in C++?
...ew name to a function? For example, I want to use the name holler for printf . #define is obvious... any other way?
8 An...
Printing the correct number of decimal points with cout
I have a list of float values and I want to print them with cout with 2 decimal places.
12 Answers
...
Better naming in Tuple classes than “Item1”, “Item2”
...
The syntax is List<(int first, int second)>. I had to download the System.ValueTuple package from NuGet to get it to work in Visual Studio 2017.
– Matt Davis
Mar 25 '17 at 23:19
...
What is the idiomatic Go equivalent of C's ternary operator?
...
As pointed out (and hopefully unsurprisingly), using if+else is indeed the idiomatic way to do conditionals in Go.
In addition to the full blown var+if+else block of code, though, this spelling is also used often:
index := val
i...
LINQ Select Distinct with Anonymous Types
...
It might be worth petitioning MS to introduce the "key" syntax into C# that VB has (where you can specify certain properties of an anonymous type to be the 'primary key' - see the blog post I linked to).
– Matt Hamilton
Fe...
foreach with index [duplicate]
...ublic static void Each<T>(this IEnumerable<T> ie, Action<T, int> action)
{
var i = 0;
foreach (var e in ie) action(e, i++);
}
And use it like so:
var strings = new List<string>();
strings.Each((str, n) =>
{
// hooray
});
Or to allow for break-like behaviou...
What is the performance cost of having a virtual method in a C++ class?
... class will have a virtual table, and every instance will have a virtual pointer.
9 Answers
...
Data structure: insert, remove, contains, get random element, all at O(1)
I was given this problem in an interview. How would you have answered?
14 Answers
14
...
How to get the user input in Java?
...ner;
//...
Scanner scan = new Scanner(System.in);
String s = scan.next();
int i = scan.nextInt();
BufferedReader and InputStreamReader classes
import java.io.BufferedReader;
import java.io.InputStreamReader;
//...
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String s ...
Java's final vs. C++'s const
...e, later in Java only e.g.:
public class Foo {
void bar() {
final int a;
a = 10;
}
}
is legal in Java, but not C++ whereas:
public class Foo {
void bar() {
final int a;
a = 10;
a = 11; // Not legal, even in Java: a has already been assigned a value.
}
}
I...