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Hi,

I wonder if this is a legal array declaration?

const int size = 5;
double array[size];

Or should I use "new"?

Thanks.

wrote:
> I wonder if this is a legal array declaration?
>
> const int size = 5;
> double array[size];

Yes, it is. 'size' is a compile-time constant expression.

> Or should I use "new"?

Up to you.

V

<> wrote in message
news: ups.com...
> Hi,
>
> I wonder if this is a legal array declaration?
>
> const int size = 5;
> double array[size];
>

Yes, it's legal, because it uses a const int initialized by a constant
expression. This allows the compielr to treat it as a compile-time
constant, just as if you'd simply used the constant expression 5 directly in
the array declaration.

-Howard

wrote:
> Hi,
>
> I wonder if this is a legal array declaration?
>
> const int size = 5;
> double array[size];
>
> Or should I use "new"?
>
> Thanks.

You should use the constant expression for a statically-sized array
since the number of bytes needed is known at compile time. Using new in
this situation incurs unnecessary overhead at runtime; worse, it
imposes on the program a requirement to call delete on the array, which
if neglected, will cause memory to leak.

In general, use new to allocate arrays that are either too large to be
allocated on the stack or whose size is not known until runtime.

Greg