[Beginner]Variable length arrays
helxi via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Sat Feb 25 06:44:48 PST 2017
On Saturday, 25 February 2017 at 14:34:31 UTC, rikki cattermole
wrote:
> On 26/02/2017 3:31 AM, helxi wrote:
>> I am trying to create an array which has a user defined size.
>> However
>> the following program is not compiling:
>>
>> import std.stdio;
>>
>> void main(){
>> write("Enter your array size: ");
>> int n;
>> readf(" %s", &n);
>> int[n] arr; //<-Error: variable input cannot be read at
>> compile time
>> writeln(arr);
>> }
>>
>> 1. What's causing this?
>
> T[X] is a static array, its size must be known at compile time.
> Static arrays are passed around by value not by reference and
> generally get stored on the stack not the heap.
>
>> 2. How can I get around this? I know I can always create a
>> loop that
>> appends value 'n' times.
>
> This is where you want a dynamic array, allocated on the heap
> at runtime.
>
> T[] array;
> array.length = n;
Thanks
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