C++ Program to Interchange elements of first and last rows in matrix

// C++ code to swap the element of first
// and last row and display the result
#include <iostream>
using namespace std;

#define n 4

void interchangeFirstLast(int m[][n])
{
        int rows = n;
        
        // Swapping of element between first
        // and last rows
        for (int i = 0; i < n; i++)
        {
            int t = m[0][i];
            m[0][i] = m[rows - 1][i];
            m[rows - 1][i] = t;
        }
} 

// Driver code
int main()
{
    // input in the array
    int m[n][n] = {{8, 9, 7, 6},
                   {4, 7, 6, 5},
                   {3, 2, 1, 8},
                   {9, 9, 7, 7}}; 
                
    interchangeFirstLast(m); 
    
    // Printing the interchanged matrix
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++) 
            cout << m[i][j] << " ";
        cout << endl;
    }
}

// This code is contributed by Anant Agarwal.