Allocate memory for 2D array with C++ new[]

Question

When I read some values from the user and I need to create an array of the specific size I do it somehow like this:

#include 
using namespace         


        

Answer 1

If a and b are the number of rows and number of columns, respectively, you may allocate the array like this:

new unsigned[a * b];

To access the element at row i and column j, do this:

numbers[i * b + j]

However, note that in reality you're almost certainly better off using std::vector for whatever you're trying to do, but you may not have learned about that yet :)