Interchange elements of first and last columns in matrix

Given a 4 x 4 matrix, the task is to interchange the elements of first and last columns and show the resulting matrix.

Examples:

Input:
8 9 7 6
4 7 6 5
3 2 1 8
9 9 7 7
Output:
6 9 7 8
5 7 6 4
8 2 1 3
7 9 7 9

Input: 
9 7 5 1
2 3 4 1
5 6 6 5
1 2 3 1
Output: 
1 7 5 9
1 3 4 2
5 6 6 5
1 2 3 1


The approach is very simple, we can simply swap the elements of first and last column of the matrix in order to get the desired matrix as output.

Below is the implementation of the above approach :

C++

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// C++ code to swap the element of first
// and last column and display the result
#include <iostream>
using namespace std;
  
#define n 4
  
void interchangeFirstLast(int m[][n])
{
    int cols = n;
  
    // swapping of element between first
    // and last columns
    for (int i = 0; i < n; i++) {
        int t = m[i][0];
        m[i][0] = m[i][n - 1];
        m[i][n - 1] = t;
    }
}
  
// Driver function
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;
    }
}

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Java

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// Java code to swap the element of first
// and last column and display the result
  
import java.io.*;
  
class GFG {
     
static int n = 4;
  
static void interchangeFirstLast(int m[][])
{
    int cols = n;
  
    // swapping of element between first
    // and last columns
    for (int i = 0; i < n; i++) {
        int t = m[i][0];
        m[i][0] = m[i][n - 1];
        m[i][n - 1] = t;
    }
}
  
// Driver function
  
    public static void main (String[] args) {
            // input in the array
    int m[][] = { { 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++)
            System.out.print(m[i][j] + " ");
            System.out.println();
    }
    }
}
// This code is contributed by inder_verma

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Python 3

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# Python3 code to swap the element of
# first and last column and display 
# the result 
    
def interchangeFirstLast(mat, n, m): 
    rows =
        
    # swapping of element between 
    # first and last columns
    for i in range(n): 
            t = mat[i][0];
            mat[i][0] = mat[i][n-1];
            mat[i][n-1] = t;
    
# Driver Program 
mat = [[8, 9, 7, 6], 
       [4, 7, 6, 5], 
       [3, 2, 1, 8], 
       [9, 9, 7, 7]] 
    
n = 4
m = 4
interchangeFirstLast(mat, n, m) 
    
# printing the interchanged matrix 
for i in range(n): 
    for j in range(m): 
        print(mat[i][j], end = " "
    print("\n"

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C#

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// C# code to swap the element of first
// and last column and display the result
using System;
  
class GFG
{
      
static int n = 4;
  
static void interchangeFirstLast(int[, ] m)
{
    int cols = n;
  
    // swapping of element between first
    // and last columns
    for (int i = 0; i < n; i++) 
    {
        int t = m[i, 0];
        m[i, 0] = m[i, n - 1];
        m[i, n - 1] = t;
    }
}
  
// Driver Code
public static void Main () 
{
// input in the array
int[,] m = { { 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++)
        Console.Write(m[i, j] + " ");
        Console.WriteLine();
}
}
}
  
// This code is contributed
// by Akanksha Rai

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PHP

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<?php
// PHP code to swap the element of first
// and last column and display the result
  
function interchangeFirstLast($m, $n)
{
    $cols = $n;
  
    // swapping of element between first
    // and last columns
    for ($i = 0; $i < $n; $i++) 
    {
        $t = $m[$i][0];
        $m[$i][0] = $m[$i][$n - 1];
        $m[$i][$n - 1] = $t;
    }
    return $m ;
}
      
// Driver Code
  
// input in the array
$m = array( array( 8, 9, 7, 6 ),
            array (4, 7, 6, 5 ),
            array (3, 2, 1, 8 ),
            array (9, 9, 7, 7 ));
  
$n = 4 ;
$m = interchangeFirstLast($m,$n);
  
// printing the interchanged matrix
for ($i = 0; $i < $n; $i++)
{
    for ($j = 0; $j < $n; $j++)
        echo $m[$i][$j], " ";
          
    echo "\n" ;
}
  
// This code is contributed by Ryuga
?>

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Output:

6 9 7 8 
5 7 6 4 
8 2 1 3 
7 9 7 9


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Improved By : inderDuMCA, Ryuga, Akanksha_Rai



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