a notation for representing fixed values in source code
External links
- Wikipedia: Literal (computer programming)
Questions tagged [literals]
1554 questions
41
votes
1 answer
Java hexadecimal base double literal
I am studying for java certification. And i'm curious about the java literals.
I know it is possible to do something like this:
int i = 0xAA;
long l = 0xAAL;
Also this is possible for floating-point variables:
double d = 123d;
float f = 123f;
So I…
Bruno Calça
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41
votes
5 answers
Why is it allowed to pass R-Values by const reference but not by normal reference?
The following program
void display(const int& a)
{
cout << a ;
}
will work if called with a literal like this
display(5);
but without the const it won't work.
So how can a const reference keep pointing to an R-Value (anonymous variable)?
AnotherOne
- 854
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41
votes
2 answers
nested struct initialization literals
How can I do this:
type A struct {
MemberA string
}
type B struct {
A A
MemberB string
}
...
b := B {
MemberA: "test1",
MemberB: "test2",
}
fmt.Printf("%+v\n", b)
Compiling that gives me: "unknown B field 'MemberA' in struct…
Brad Peabody
- 10,917
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- 63
37
votes
3 answers
Type of integer literals not int by default?
I just answered this question, which asked why iterating until 10 billion in a for loop takes so much longer (the OP actually aborted it after 10 mins) than iterating until 1 billion:
for (i = 0; i < 10000000000; i++)
Now my and many others'…
Christian Rau
- 45,360
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37
votes
2 answers
C++11 operator"" with double parameter
Consider:
struct str {};
str operator"" _X(long double d) {
return str();
}
This compiles fine with g++ 4.7.2 Wall std=c++11
but now if I give a double :
str operator"" _X(double d) {
return str();
}
I get the following error…
Bérenger
- 2,678
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37
votes
4 answers
Is the u8 string literal necessary in C++11
From Wikipedia:
For the purpose of enhancing support for Unicode in C++ compilers, the definition of the type char has been modified to be at least the size necessary to store an eight-bit coding of UTF-8.
I'm wondering what exactly this means for…
Lukas Schmelzeisen
- 2,934
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35
votes
5 answers
Use XML Literals in C#?
Is it possible to add literal XML data within a C# code file? I'm currently using a multiline string literal but it gets messy as you can see. Any better way of doing this?
string XML = @"
Robin Rodricks
- 110,798
- 141
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34
votes
2 answers
C++ vector literals, or something like them
I'm writing some code against a C++ API that takes vectors of vectors of vectors, and it's getting tedious to write code like the following all over the place:
vector vs1;
vs1.push_back("x");
vs1.push_back("y");
...
vector…
Chris Conway
- 55,321
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34
votes
7 answers
Scope of (string) literals
I always try to avoid to return string literals, because I fear they aren't defined outside of the function. But I'm not sure if this is the case. Let's take, for example, this function:
const char *
return_a_string(void)
{
return "blah";
}
Is…
quinmars
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34
votes
3 answers
When should you use === vs ==, !== vs !=, etc.. in javascript?
Possible Duplicate:
Javascript === vs == : Does it matter which “equal” operator I use?
What are the differences between === vs == and !== vs !=?
When should you use each one?
Matt
- 5,547
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33
votes
7 answers
Should we generally use float literals for floats instead of the simpler double literals?
In C++ (or maybe only our compilers VC8 and VC10) 3.14 is a double literal and 3.14f is a float literal.
Now I have a colleague that stated:
We should use float-literals for float calculations and double-literals for double calculations as this…
Martin Ba
- 37,187
- 33
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- 337
32
votes
3 answers
'as const' combined with type?
I want to combine both having a type for a constant, and using it "as const" to get the literal types as the type:
type MyType = {name: string};
const x:MyType = {
name: 'test' // Autocompleted, typesafe. But Type is {name: string}, not
…
user2154768
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- 16
32
votes
2 answers
Passing Array to Spark Lit function
Let's say I have a numpy array a that contains the numbers 1-10:
[1 2 3 4 5 6 7 8 9 10]
I also have a Spark dataframe to which I want to add my numpy array a. I figure that a column of literals will do the job. This doesn't work:
df =…
A. R.
- 433
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- 8
32
votes
2 answers
Are there binary literals in Java?
I want to declare my integer number by a binary literal. Is it possible in Java?
Conscious
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31
votes
5 answers
How to break a big lua string into small ones
I have a big string (a base64 encoded image) and it is 1050 characters long. How can I append a big string formed of small ones, like this in C
function GetIcon()
return "Bigggg string 1"\
"continuation of string"\
"continuation of…
bratao
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