user take input in 2d array dynamic 2d

[bird1234]

i want to take the input in 2d array but how

 int n1,n2;
 int *arr;
cout<<"\nEnter The Row : ";
cin>>n1;
cout<<"\nEnter The Col : ;
cin>>n2;
arr=new int[n1][n2]; 

error [n2] must be const but how to take input in it

plz help

[oy0Gy60M]

One way you can create 2d array using your approach (but it is still an 1d array) :

int n1, n2;
int *arr;
cout<<"\nEnter The Row : ";
cin>>n1;
cout<<"\nEnter The Col : ;
cin>>n2;
arr = new int[n1 * n2]; 

If you want to create an 2d array, you need a two-dimensional pointer. So you can do this :

int n1, n2;
int **arr;
cout<<"\nEnter The Row : ";
cin >> n1;
cout<<"\nEnter The Col : ";
cin >> n2;

int i;
arr = new int*[n1];
for(i = 0; i < n1; i++) arr[i] = new int[n2];

[bird1234]

thnx