Error declaring array

[jEb91hU5]

I'm getting a compiler error when trying to initialize this array. It says I'm not able to use the variable as a constant. I'm not sure how to resolve this. Any feedback would be appreciated.

  int n, c;

    cin >> n >> c;
    int arr[n]; //error is here 

Edit: I believe I meant to say declaring the size of the array. That is what I’m having issues on.

Edit2: swapped out array for a vector.

[jonnin]

array must be a compile time constant. vector is correct way to have the size at run-time.

[George P]

#include <iostream>
#include <vector>

int main()
{
   // get a size for the vector
   std::cout << "Enter the vector's size (positive integer only): ";
   unsigned v_size { };
   std::cin >> v_size;

   // create a vector sized to the user input
   std::vector<int> vec(v_size);

   // let's see if the vector was properly created
   std::cout << "\nThe vector's size is " << vec.size() << '\n';

   // let's loop through the vector's elements, using a range-based for loop
   for (const auto& itr : vec)
   {
      std::cout << itr << ' ';
   }
   std::cout << '\n';
}

Enter the vector's size (positive integer only): 5

The vector's size is 5
0 0 0 0 0