a notation for representing fixed values in source code
External links
- Wikipedia: Literal (computer programming)
Questions tagged [literals]
1554 questions
26
votes
2 answers
What is the datatype of string literal in C++?
I'm confused about the datatype of a string literal. Is it a const char * or a const char?
Vihaan Verma
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25
votes
3 answers
Scala Functional Literals with Implicits
Forgive me if this has already been asked elsewhere. I have a Scala syntax question involving function-values and implicit parameters.
I'm comfortable using implicits with Scala's currying feature. For instance if I had a sum function and wanted…
shj
- 1,558
- 17
- 23
25
votes
4 answers
Difference between N'String' vs U'String' literals in Oracle
What is the meaning and difference between these queries?
SELECT U'String' FROM dual;
and
SELECT N'String' FROM dual;
Ganesh
- 486
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25
votes
2 answers
JavaScript: JSLint throws "Read Only
My code:
note: the Slider Object is declared but omitted in the snippet below for better readability
"use strict";
/*global arrayContainer, SliderInstance, DomObjects */
arrayContainer = new Slider.constructArray();
SliderInstance =…
Stephan Kristyn
- 15,015
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25
votes
5 answers
Is there a clean way to specify character literals in Swift?
Swift seems to be trying to deprecate the notion of a string being composed of an array of atomic characters, which makes sense for many uses, but there's an awful lot of programming that involves picking through datastructures that are ASCII for…
Alex Clark
- 357
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25
votes
1 answer
Is the literal 0xffffffff int or unsigned in C++
According to this, integer literals without type suffix are always ints. However, both gcc and clang interpret 0xffffffff (or any literal which explicitly sets the sign bit other than using the -) as unsigned. Which is correct? (according to this…
Walter
- 44,150
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24
votes
1 answer
Integer literal for fixed width integer types
Is there some c++ proposal for Integer literal for fixed width integer types like this?
// i's type is unsigned int
auto i = 10u;
// j's type is uint32_t
auto j = 10u32;
康桓瑋
- 33,481
- 5
- 40
- 90
24
votes
4 answers
Narrowing string to string literal union
I want to narrow a string to a string literal union. In other words, I want to check if the string is one of the possible values of my literal union, so that this will work (if the operator couldbe existed).
type lit = "A" | "B" | "C";
let uni:…
iFreilicht
- 13,271
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- 74
23
votes
1 answer
What do number literals with a suffix, like 0u8, mean in Rust?
I'm reading through The Rust Programming Language and have encountered this notation: 0u8.
let some_u8_value = 0u8;
match some_u8_value {
1 => println!("one"),
3 => println!("three"),
5 => println!("five"),
7 => println!("seven"),
…
Jack Steam
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23
votes
2 answers
Why must a string be constructed at run-time?
Can C-Strings or std::strings be created as constexpr or must they be created at run-time?
With gcc 4.9.2 I can do this:
constexpr const char foo[] = "blee";
(Sadly the November 2013 Customer Technology Preview does not allow Visual Studio to…
Jonathan Mee
- 37,899
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22
votes
5 answers
Python Literal r'\' Not Accepted
r'\' in Python does not work as expected. Instead of returning a string with one character (a backslash) in it, it raises a SyntaxError. r"\" does the same.
This is rather cumbersome if you have a list of Windows paths like these:
paths = […
Alfe
- 56,346
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- 107
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22
votes
2 answers
Assigning literals to terms in GHC
Out of curiosity, why is the following program
1 = 0
"hello" = "world"
valid and compilable by GHC? Is this merely a bug or a feature? Thanks!
thoughtpolice
- 479
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22
votes
4 answers
javascript/json date literal
What's the date literal for JSON/JavaScript ( if such thing does exists? )
OscarRyz
- 196,001
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- 569
22
votes
0 answers
accessing a python int literals methods
Since everything is an object in python, even literals, we are typically allowed to call methods directly on a literal.
ex:
'hello'.upper()
In theory, it seems like the same thing should be allowed for int literals
ex:
4.bit_length()
However,…
CADBOT
- 416
- 2
- 9
21
votes
4 answers
Why does this function return a different value every time?
Can someone explain the following behavior? Specifically, why does the function return a different list every time? Why isn't some-list initialized to '(0 0 0) every time the function is called?
(defun foo ()
(let ((some-list '(0 0 0)))
(incf…
user285321