Array Length with Integer Help?

[hacksign23]

Well I'm declaring an array with text length,

so i did
int i[this->textBox1->textlength];
but that didn't work so i did
int q = this->textBox1->textlength;
int i[q];

but neither did that work.

any ideas?

thanks.

[oler1s]

neither did that work

Sorry to hear that.

any ideas?

Fix the problem.

Obviously, we can give you no help because you have provided us with no real information.

[hacksign23]

Sorry to hear that.
Fix the problem.

Obviously, we can give you no help because you have provided us with no real information.

 int q = this->textBox1->TextLength;
				 int i = 1;
				 int o[q];
				 int a = 0;
				 o[0] = 0;

Form1.h(105) : error C2057: expected constant expression
Form1.h(105) : error C2466: cannot allocate an array of constant size 0
Form1.h(105) : error C2133: 'o' : unknown size
Form1.h(112) : warning C4800: 'int *' : forcing value to bool 'true' or 'false' (performance warning)

[Tassos Souris]

obviously, the compiler you are using does not support allocating arrays with sizes that are not only constants... are you using Visual Studio? cause visual studio does not support the C99 standard at all!!

[boxfish]

You can't make a static array with a variable size. Better use a dynamic array or a vector.

[hacksign23]

You can't make a static array with a variable size. Better use a dynamic array or a vector.

yea i'm using VC++ Express Edition 2008 edition

andd.... please don't confuse me with "dynamic array or vector" because i started C++... about 3 hours ago. thanks.

(a good example would be good enough)

[Laharl]

Because the compiler doesn't know how much memory to allocate when you don't use a constant expression, it throws an error. To rectify this, use 'new', like this:

int *arr = new int[10];
//...
delete arr;

This allows you to allocate memory in variable sizes. Any pointer/memory you allocate with new MUST be deallocated with delete when you're done with it. Read a good tutorial at http://www.cplusplus.com/doc/tutorial/.

[newb16]

int *arr = new int[10];
//...
delete arr;

Rather delete[] arr;

[Tassos Souris]

Because the compiler doesn't know how much memory to allocate when you don't use a constant expression, it throws an error. To rectify this, use 'new', like this:

int *arr = new int[10];
//...
delete arr;

This allows you to allocate memory in variable sizes. Any pointer/memory you allocate with new MUST be deallocated with delete when you're done with it. Read a good tutorial at [URL=http://www.cplusplus.c om/doc/tutorial/[/URL].

look at the C99 standard
the new C++ standard (almost done) will support C99..

[Banfa]

Are you using .NET? A Windows Form? If so then this would be more preferable

array<int>^ MyArray = gcnew array<int>(ARRAY_SIZE);

Which creates a handle to an array of integers.

[Laharl]

look at the C99 standard
the new C++ standard (almost done) will support C99..

I'm fairly familiar with C99 (and C++0x), but VS does not support C99, nor is there (AFAIK) a way to enable C99 compliance in VS the way -std=c99 does in gcc.

[hacksign23]

oh thanks! that worked.

[Banfa]

I'm fairly familiar with C99 (and C++0x), but VS does not support C99, nor is there (AFAIK) a way to enable C99 compliance in VS the way -std=c99 does in gcc.

Noting that -std=c99 does not even produce strict C99 compliance in the GCC compiler since it has yet to fully implement the C99 standard (although it is getting quite close).