# 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
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

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++

 `// C++ code to swap the element of first ` `// and last column and display the result ` `#include ` `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; ` `    ``} ` `} `

## Java

 `// 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 `

## Python 3

 `# 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"``)  `

## C#

 `// 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 `

## PHP

 ` `

Output:

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

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.

My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

1

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.