Declaration is the part of the subprogram (procedure or function) which provides the protocol(header), but not the body of the subprogram.
Questions tagged [declaration]
3407 questions
73
votes
6 answers
Strange array return type
Has any one seen the array [] placed after the method signature like this?
public static String mySplit(String s)[] {
return s.split(",");
}
public static void main(String... args) {
String[] words = mySplit("a,b,c,d,e");
…
Peter Lawrey
- 525,659
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70
votes
8 answers
Complex C declaration
I was just going through some code on the Internet and found this:
float * (*(*foo())[SIZE][SIZE])()
How do I read this declaration? Is there a specific set of rules for reading such complex declarations?
Kaunteya
- 3,107
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69
votes
13 answers
Strict mode in PHP
Other languages with automatic variable declaration - like Perl - have a strict mode.
By activating this strict mode, variable declaration is required, and Perl throws an error as soon as you try to use an undeclared variable.
Does PHP offer a…
jantimon
- 36,840
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68
votes
13 answers
What is an 'undeclared identifier' error and how do I fix it?
What are undeclared identifier errors? What are common causes and how do I fix them?
Example error texts:
For the Visual Studio compiler: error C2065: 'cout' : undeclared identifier
For the GCC compiler: 'cout' undeclared (first use in this…
sashoalm
- 75,001
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64
votes
14 answers
Eclipse Open declaration in Java project
In an Eclipse SVN project I have a problem; when I tried to open a declaration of one class, I got this error:
Problems opening an editor Reason : projectname does not exist.
Also refactoring does not work.
I have searched the web and tried all…
Taegug
- 641
- 1
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- 3
62
votes
5 answers
If two objects are declared in a single line, in which order are they constructed?
Let's say a class has been defined as
class A {
//.....
};
and now I am creating two objects as
A a,b;
In what order are a and b created? Is it defined by the standard?
pasha
- 2,035
- 20
- 34
60
votes
3 answers
forward declaration of a struct in C?
#include
struct context;
struct funcptrs{
void (*func0)(context *ctx);
void (*func1)(void);
};
struct context{
funcptrs fps;
};
void func1 (void) { printf( "1\n" ); }
void func0 (context *ctx) { printf( "0\n" ); }
void…
user1128265
- 2,891
- 10
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- 34
60
votes
11 answers
Define local function in JavaScript: use var or not?
When a local (inner) function is declared in JavaScript, there are two options:
Declaring with var keyword, assigning to the variable:
(function() {
var innerFunction1 = function() { ... };
innerFunction1();
}());
Declaring just with the…
Pavel S.
- 11,892
- 18
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- 113
58
votes
5 answers
Compiler error when declaring a variable inside if condition and no curly braces
Why does this first if compile well and the second fail?
if(proceed) {int i;} // This compiles fine.
if(proceed) int i;// This gives an error. (Syntax error on token ")", { expected after this token)
ironwood
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55
votes
10 answers
How does the Java array argument declaration syntax "..." work?
I have been writing java for a while, and today I encountered the following declaration:
public static void main(String... args) {
}
Note the "dot dot dot" in the array declaration, rather than the usual bracket []. Clearly it works. In fact I…
Virtually Real
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55
votes
4 answers
What does it mean when there is a comma inside an array declaration? e.g. float[,]
I have some code I'm trying to understand while learning C#. I do not understand what I even need to search Google for to get here, but the code is as follows:
float[,] heightAll = terData.GetHeights(0, 0, allWidth, allHeight);
Why does the array…
ricky
- 553
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- 4
52
votes
8 answers
Redeclaring a javascript variable
In this tutorial there is written:
If you redeclare a JavaScript variable, it will not lose its value.
Why should I redeclare a variable? Is it practical in some situations?
thank you
xralf
- 3,312
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52
votes
8 answers
TS4023: Exported Variable has or is using name from external module but cannot be named
I've seen this answered before, but they don't seem to cover this specific use case (or they don't work/help)
import {Route} from 'vue-router';
export const detailRoute = {
path: '/detail/:id',
component: Detail,
props: (route: Route) => ({
…
user358089
51
votes
2 answers
What are declarations and declarators and how are their types interpreted by the standard?
How exactly does the standard define that, for example, float (*(*(&e)[10])())[5] declares a variable of type "reference to array of 10 pointer to function of () returning pointer to array of 5 float"?
Inspired by discussion with @DanNissenbaum
Joseph Mansfield
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50
votes
2 answers
Easy rule to read complicated const declarations?
For reading complex pointer declarations there is the right-left rule.
But this rule does not mention how to read const modifiers.
For example in a simple pointer declaration, const can be applied in several ways:
char *buffer; // non-const pointer…
maxschlepzig
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