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])
{ 
    // 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 = n  


        


    # 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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    Article Tags : 
Matrix
School Programming

           	
Practice Tags : 
Matrix

        

         

         
 
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