Hi Tyler(hi everybody)
well, maybe i did not explain very well.
i wish define a bidimensional dinamic array in this form as a global
variable
...
#define N 1000
#define J 1000
using name space std;
double ** a = new double [N+1]
for (int i=0;i<N+1;i++)
a[i] = new double[J+1]
...
int main()
{
...
...
}
in this part the programm shows an error. I think that before command main()
i cannot use
for (int i=0; i<N...)
In a few words, how can i define a bidimensional dinamic array as a global
variable)
is it true that global variables are defined after command using namespace
std and before main()?
Thanks all.
Miguel.
Tyler Littlefield wrote:
>
> I'm really confused what your asking. you want a global array--just define
> it outside the function, as you did.
>
> Thanks,
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> ----- Original Message -----
> From: Miguel Caro
> To: [email protected]
> Sent: Wednesday, October 08, 2008 6:15 PM
> Subject: [c-prog] dynamic array as global variables to use in a function
>
>
>
> Hello everybody,
>
> well i wish to ennounce two global variables to use after in a function.
> One variable i define as an unidimensional vector. I did it very well, i
> think so, the variable is called x[].
> But i wish to define a new global variable, as bidimensional dynamic
> array,
> is called a[][]. But i don't know how to define this dynamic array a[][]
> as
> global variable.
>
> I knwo how to define dynamica array(unidimensional or bidimensional)
> inside
> the main program or inside any function, but as a global variable?
>
> It is important to remark that i have defined in my program three or
> more
> functions whose one of incoming variables is a bidimeniosnal dynamic
> array.
>
> Next i post a part of program
> Any help it is important to me.
> Thank You all,
> Miguel.
>
> Program
> using namespace std;
> float a[16][16];//in this part i wish define the bidimensional dynamic
> array
>
> //i'm defining unidimensional dynamic array x
> const N=1000;
> float* x = new float[N];
> //first function using dynamic array x[]
>
> float suma3(float x[])
> {
> int j; float s=0.0;
> for (j=1;j<16;j++)
> s=s+x[j];
> return(s);
> }
> //second function i wish , for example here, usin a[][] as bidimensional
> dynamic array. how to do?
> float suma1(int i, float x[], float a[][16])
> {
> int l;
> float s=0;
> for (l=1;l<i;l++)
> {
> s=s+a[i][l]*x[l];
> }
> return(s);
> }///fin suma 1
>
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