Questions tagged [array-initialization]
123 questions
878
votes
19 answers
All possible array initialization syntaxes
What are all the array initialization syntaxes that are possible with C#?
Joshua Girard
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123
votes
7 answers
Array initializing in Scala
I'm new to Scala ,just started learning it today.I would like to know how to initialize an array in Scala.
Example Java code
String[] arr = { "Hello", "World" };
What is the equivalent of the above code in Scala ?
Emil
- 13,577
- 18
- 69
- 108
87
votes
12 answers
How can I declare a two dimensional string array?
string[][] Tablero = new string[3][3];
I need to have a 3x3 array arrangement to save information to. How do I declare this in C#?
delete
82
votes
8 answers
Array size at run time without dynamic allocation is allowed?
I've been using C++ for a few years, and today I saw some code, but how can this be perfectly legal?
int main(int argc, char **argv)
{
size_t size;
cin >> size;
int array[size];
for(size_t i = 0; i < size; i++)
{
array[i]…
syaz
- 2,659
- 6
- 36
- 44
81
votes
9 answers
Create N-element constexpr array in C++11
Hello i'm learning C++11, I'm wondering how to make a constexpr 0 to n array, for example:
n = 5;
int array[] = {0 ... n};
so array may be {0, 1, 2, 3, 4, 5}
Christopher Aldama
- 821
- 1
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- 5
55
votes
4 answers
Are char arrays guaranteed to be null terminated?
#include
int main() {
char a = 5;
char b[2] = "hi"; // No explicit room for `\0`.
char c = 6;
return 0;
}
Whenever we write a string, enclosed in double quotes, C automatically creates an array of characters for us,…
Dan
- 2,694
- 1
- 6
- 19
51
votes
6 answers
Braces around string literal in char array declaration valid? (e.g. char s[] = {"Hello World"})
By accident I found that the line char s[] = {"Hello World"}; is properly compiled and seems to be treated the same as char s[] = "Hello World";. Isn't the first ({"Hello World"}) an array containing one element that is an array of char, so the…
halex
- 16,253
- 5
- 58
- 67
43
votes
3 answers
Initialize List<> with Arrays.asList
Why does this work:
String[] array = {"a", "b", "c"};
List list = Arrays.asList(array);
but this does not:
List list = Arrays.asList({"a","b","c"});
transient_loop
- 5,984
- 15
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- 117
33
votes
3 answers
Zero-Initialize array member in initialization list
I have a class with an array member that I would like to initialize to all zeros.
class X
{
private:
int m_array[10];
};
For a local variable, there is a straightforward way to zero-initialize (see here):
int myArray[10] = {};
Also, the class…
ValarDohaeris
- 6,064
- 5
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- 43
22
votes
4 answers
Can array members be initialized self-referentially?
Consider the following code in which we initialize part of D based on another part of D:
struct c {
c() : D{rand(), D[0]} {}
int D[2];
};
int main() {
c C;
assert(C.D[0] == C.D[1]);
}
Is the above program well-defined? Can we…
Emil Laine
- 41,598
- 9
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- 157
22
votes
2 answers
Shortcut for creating character array
Since I like to Split() strings, I usually use
new char[] { ';' }
or something like that for a parameter for Split().
Is there any shortcut for creating a character array with one element at compile time? Not that I mind typing, but...
Daniel Mošmondor
- 19,718
- 12
- 58
- 99
21
votes
3 answers
Why can't you use shorthand array initialization of fields in Java constructors?
Take the following example:
private int[] list;
public Listing() {
// Why can't I do this?
list = {4, 5, 6, 7, 8};
// I have to do this:
int[] contents = {4, 5, 6, 7, 8};
list = contents;
}
Why can't I use shorthand…
Ethan Turkeltaub
- 2,931
- 8
- 30
- 45
21
votes
3 answers
Initializing variable length array
On initializing a Variable length array compiler gives an error message:
[Error] variable-sized object may not be initialized
Code snippet:
int n;
printf("Enter size of magic square: ");
scanf("%d",&n);
int board[n][n] = {0};
How should…
haccks
- 104,019
- 25
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20
votes
2 answers
What language standards allow ignoring null terminators on fixed size arrays?
We are transitioning C code into C++.
I noticed that the following code is well defined in C,
int main(){
//length is valid. '\0' is ignored
char str[3]="abc";
}
as it is stated in Array initialization that:
"If the size of the array is…
Trevor Hickey
- 36,288
- 32
- 162
- 271
19
votes
2 answers
Is there a way to not have to initialize arrays twice?
I need to initialize each element of an array to a non-constant expression. Can I do that without having to first initialize each element of the array to some meaningless expression? Here's an example of what I'd like to be able to do:
fn foo(xs:…
kmky
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