C++ - Passing 2D array to function

Question

I am trying to pass a 2D array to a function but I am failing to do so. There is no problem with passing 1D array. How can I do this?

#include <iostream>
    
    using namespace std;
    
    void DisplayBoard(int matrix[],int n) // Prints out the given array.
    {
            for (int j = 0; j < n; j++)
            {
                    cout << matrix[j];
            }
    }
    
    int main()
    {
        int n,m;
        cin>>n;
        //int matrix[n]={};
        DisplayBoard(matrix,n);
        return 0;
    }

Answer 1

You should input the index number (n) and the array object from the user. Here is a edited version of your code

#include <iostream>
using namespace std;

void DisplayBoard(int matrix[],int n) // Prints out the given array.
{ 
  cout<<endl ; 
     for (int j = 0; j < n; j++)
      {
              cout << matrix[j]<<" ";
       }
    }

     int main() {
       int n,m;
         cin>>n ; 
         int matrix[n];
  
         for(int i=0;i<n;i++) {
            cin>>matrix[i];
               } 
             DisplayBoard(matrix,n);
          return 0;
        }

Remember to declare an array in the main function too, that was one of the errors in your code!

Also, it is incorrect to declare an array like this:

int matrix[n]={}