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I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.

#include <iostream>
using namespace std;
 
int main ()
{
    static int array[10][10];
    int i, j, m, n, a;
 
    cout<<"Enter the order of the matix \n";
    cin>>m;
    cin>>n;
    if (m == n)
    {
        cout<<"Enter the co-efficients of the matrix\n";
        for (i = 0; i < m; ++i)
        {
            for (j = 0; j < n; ++j)
            {
                cin>>array[i][j];
            }
        }
        cout<<"The given matrix is \n";
        for (i = 0; i < m; ++i)
        {
            for (j = 0; j < n; ++j)
            {
                cout<<" "<<array[i][j];
            }
            cout<<"\n";
        }
        for (i = 0; i < m; ++i)
        {
            a = array[i][i];
            array[i][i] = array[i][m - i - 1];
            array[i][m - i - 1] = a;
        }
        cout<<"The matrix after changing the \n";
        cout<<"main diagonal & secondary diagonal\n";
        for (i = 0; i < m; ++i)
        {
            for (j = 0; j < n; ++j)
            {
                cout<<" "<<array[i][j];
            }
            cout<<"\n";
        }
    }
    else
        cout<<"The given order is not square matrix\n";
}

Result:

Enter the order of the matix 

3

3

Enter the co-efficients of the matrix

1

2

3

4

5

6

7

8

9

The given matrix is 

 1 2 3

 4 5 6

 7 8 9

The matrix after changing the 

main diagonal & secondary diagonal

 3 2 1

 4 5 6

 9 8 7

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