Input not accepted

[GuOddian]

The problem you have is in the loops. In the loop:

for (n=0; n<height; n++)

the n=0 sets n equal to 0 therefore ignoring the input entirely. The same goes for the for loop with m as the subject.

Try removing the for loops entirely and see what response you get from the code, I.E.

int main ()
{
    do {
        cout << "Enter n: ";
        cin >> n;
        cout << "Now m: ";
        cin >> m;
        arr[n][m]=(n+1)*(m+1);
        cout << arr[n][m] << "\n";
     } while (n != 2);
     
     return 0;
}