Define a function SWAPCOL() in C++ to swap (interchange) the first column elements with the last column elements, for a two dimensional integer array passed as the argument of the function.

Example : If the two dimensional array contains 

       2   1   4   9

       1   3   7   7 

       5   8   6   3

       7   2   1   2

After swapping of the content of 1st column and the last column, it should be :

      9   1   4   2

      7   3   7   1

      3   8   6   5

      2   2   1   7                                (CBSE 2009)

#include<iostream.h>

#include<conio.h>

void swapcol(int a[][], int r, int c)
   // r -> row, c ->col

{ int t;

for(int i = 0; i< r ; i++)

{

t = a[i][0];

a[i][0] = a[i][c-1];

a[i][c-1] = t;

}

}

void main()

{

int arr[10][10];

int m, n, i, j;

cout<<"\n Enter rows & columns :";

int m, n;

cin >> m >> n;

/* Input Array Elements */

for ( i = 0; i< m ; i++)

for( j = 0; j < n ; j++)

{

cout<< "\n Enter element for the array[ " << i+1 << " ] "<< " [ " << j+i << "]" ;

cin >> arr[i][j];

}

/* Swap function call */

swapcol(arr, m, n);

/* Display Array in Matrix form */

for( i = 0; i < m ; << i ++)

{ cout<< endl;

for (  j = 0; j < n ; j ++)

cout << arr[i][j] << "  ";

}

getch();

}