Dynamic memory

[Binarydepth via Digitalmars-d-learn]

On Friday, 24 July 2015 at 15:26:27 UTC, Adam D. Ruppe wrote:
> On Friday, 24 July 2015 at 15:22:15 UTC, Binarydepth wrote:
>> I want to use memory based on user input. In this case declare 
>> a bi-dimensional array (int[2][var]), var being the user input.
>
> Declare:
>
> int[2][] your_array;
>
> your_array.length = var;
>
>
> The runtime will handle the dynamic memory allocation for you 
> when you set the length on a slice.

this is what I did :

int liCases [2][];
         readf(" %d\n", &num);//Number of cases input
         liCases.length = num;

And I get this error :

prime1.d:26: error: constant liCases.length is not an lvalue