a notation for representing fixed values in source code
External links
- Wikipedia: Literal (computer programming)
Questions tagged [literals]
1554 questions
154
votes
6 answers
Why does long long n = 2000*2000*2000*2000; overflow?
long long int n = 2000*2000*2000*2000; // overflow
long long int n = pow(2000,4); // works
long long int n = 16000000000000; // works
Why does the first one overflow (multiplying integer literal constants to assign to a long…
Fabbiucciello
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151
votes
4 answers
Setting Short Value Java
I am writing a little code in J2ME. I have a class with a method setTableId(Short tableId). Now when I try to write setTableId(100) it gives compile time error. How can I set the short value without declaring another short variable?
When setting…
Mubashar
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146
votes
8 answers
Why write 1,000,000,000 as 1000*1000*1000 in C?
In code created by Apple, there is this line:
CMTimeMakeWithSeconds( newDurationSeconds, 1000*1000*1000 )
Is there any reason to express 1,000,000,000 as 1000*1000*1000?
Why not 1000^3 for that matter?
Duck
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144
votes
7 answers
How do I write a short literal in C++?
Very basic question: how do I write a short literal in C++?
I know the following:
2 is an int
2U is an unsigned int
2L is a long
2LL is a long long
2.0f is a float
2.0 is a double
'\2' is a char.
But how would I write a short literal? I tried 2S…
Kip
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118
votes
3 answers
Why does Python 3 allow "00" as a literal for 0 but not allow "01" as a literal for 1?
Why does Python 3 allow "00" as a literal for 0 but not allow "01" as a literal for 1? Is there a good reason? This inconsistency baffles me. (And we're talking about Python 3, which purposely broke backward compatibility in order to achieve goals…
walrus
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113
votes
4 answers
escaping question mark in regex javascript
This is a simple question I think.
I am trying to search for the occurrence of a string in another string using regex in JavaScript like so:
var content ="Hi, I like your Apartment. Could we schedule a viewing? My phone number is: ";
var gent =…
Andrew
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113
votes
1 answer
What's with the integer cache maintained by the interpreter?
After dive into Python's source code, I find out that it maintains an array of PyInt_Objects ranging from int(-5) to int(256) (@src/Objects/intobject.c)
A little experiment proves it:
>>> a = 1
>>> b = 1
>>> a is b
True
>>> a = 257
>>> b = 257
>>> a…
felix021
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109
votes
5 answers
Python regex - r prefix
Can anyone explain why example 1 below works, when the r prefix is not used?
I thought the r prefix must be used whenever escape sequences are used.
Example 2 and example 3 demonstrate this.
# example 1
import re
print (re.sub('\s+', ' ', 'hello …
JT.
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108
votes
5 answers
Java equivalent of C#'s verbatim strings with @
Quick question. Is there an equivalent of @ as applied to strings in Java:
For example I can do @"c:\afolder\afile" in C# and have it ignore the escape characters when processing instead of having to do "c:\\afolder\\aFile". Is there a Java…
Simon Rigby
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100
votes
3 answers
How do you declare a Char literal in Visual Basic .NET?
With Option Strict On:
Dim theLetterA As Char = "A"
returns an error about converting the string "A" to a Char.
What is the syntax to enter a Char literal?
Jason Berkan
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93
votes
4 answers
Why can I assign 0.0 to enumeration values, but not 1.0
Just out of curiosity: why can I assign 0.0 to a variable that is of an enumeration type, but not 1.0? Have a look at the following code:
public enum Foo
{
Bar,
Baz
}
class Program
{
static void Main()
{
Foo value1 = 0.0;
…
feO2x
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92
votes
13 answers
SQL Server - boolean literal?
How to write literal boolean value in SQL Server? See sample use:
select * from SomeTable where PSEUDO_TRUE
another sample:
if PSEUDO_TRUE
begin
select 'Hello, SQL!'
end
Note: The query above has nothing to do with how I'm going to use it. It…
kazinix
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86
votes
4 answers
What's the C++ suffix for long double literals?
In C++ (and C), a floating point literal without suffix defaults to double, while the suffix f implies a float. But what is the suffix to get a long double?
Without knowing, I would define, say,
const long double x =…
Walter
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85
votes
3 answers
What are the Java semantics of an escaped number in a character literal, e.g. '\15' ?
Please explain what, exactly, happens when the following sections of code are executed:
int a='\15';
System.out.println(a);
this prints out 13;
int a='\25';
System.out.println(a);
this prints out 21;
int a='\100';
System.out.println(a);
this…
VAr
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84
votes
12 answers
Is there a boolean literal in SQLite?
I know about the boolean column type, but is there a boolean literal in SQLite? In other languages, this might be true or false. Obviously, I can use 0 and 1, but I tend to avoid so-called "magic numbers" where possible.
From this list, it seems…
Benjamin Oakes
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