//C program to swap the element of first and last column of
//the matrix and display the result
#include <stdio.h>
#define n 3 
//*macros

void interchangeFirstLast(int mat[][n])
{
    //swap the elements between first and last columns
    for(int i=0;i<n;i++){
        int t=mat[i][0];
        mat[i][0]=mat[i][n-1];
        mat[i][n-1]=t;
    }
}
//Driver code
int main() 
{
    //input matrix
    int mat[n][n]
        ={ {2,4,6},{8,2,3},{1,9,4} };

    //print input matrix
    printf("Input matrix:\n");
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            printf("%d",mat[i][j]);
        }
        printf("\n");
    }

    //call interchangeFirstLast(mat) function.
    //This function swap the element of first and last
    //columns.

    interchangeFirstLast(mat);

    //print output matrix
    printf("Output matrix:\n");
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            printf("%d",mat[i][j]);
        }
        printf("\n");
    }
}