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Java Program to Interchange the Diagonals
In this article, we will understand how to interchange the diagonals. The matrix has a row and column arrangement of its elements. A matrix with m rows and n columns can be called as m × n matrix.
Individual entries in the matrix are called element and can be represented by a[i][j] which suggests that the element a is present in the ith row and jth column.
Below is a demonstration of the same −
Suppose our input is −
The matrix is defined as: 4 5 6 1 2 3 7 8 9
The desired output would be −
The matrix after interchanging the elements: 6 5 4 1 2 3 9 8 7
Algorithm
Step 1 - START Step 2 - Declare an integer matrix namely input_matrix, and two integer value namely matrix_size and temp. Step 3 - Define the values. Step 4 - Iterate over each element of the matrix using multiple for-loops and swap the required elements of the matrix using a temporary variable. Step 5 - Display the result Step 5 - Stop
Example 1
Here, we bind all the operations together under the ‘main’ function.
public class InterchangeDiagonals { public static int matrix_size = 3; public static void main (String[] args) { int input_matrix[][] = { {4, 5, 6}, {1, 2, 3}, {7, 8, 9} }; System.out.println("The matrix is defined as: "); for (int i = 0; i < matrix_size; i++) { for (int j = 0; j < matrix_size; j++) { System.out.print(input_matrix[i][j] + " "); } System.out.println(); } for (int i = 0; i < matrix_size; ++i) if (i != matrix_size / 2) { int temp = input_matrix[i][i]; input_matrix[i][i] = input_matrix[i][matrix_size - i - 1]; input_matrix[i][matrix_size - i - 1] = temp; } System.out.println("\nThe matrix after interchanging the elements: "); for (int i = 0; i < matrix_size; ++i) { for (int j = 0; j < matrix_size; ++j) System.out.print(input_matrix[i][j]+" "); System.out.println(); } } }
Output
The matrix is defined as: 4 5 6 1 2 3 7 8 9 The matrix after interchanging the elements: 6 5 4 1 2 3 9 8 7
Example 2
Here, we encapsulate the operations into functions exhibiting object-oriented programming.
public class InterchangeDiagonals { public static int matrix_size = 3; static void interchange_diagonals(int input_matrix[][]) { for (int i = 0; i < matrix_size; ++i) if (i != matrix_size / 2) { int temp = input_matrix[i][i]; input_matrix[i][i] = input_matrix[i][matrix_size - i - 1]; input_matrix[i][matrix_size - i - 1] = temp; } System.out.println("\nThe matrix after interchanging the elements: "); for (int i = 0; i < matrix_size; ++i) { for (int j = 0; j < matrix_size; ++j) System.out.print(input_matrix[i][j]+" "); System.out.println(); } } public static void main (String[] args) { int input_matrix[][] = { {4, 5, 6}, {1, 2, 3}, {7, 8, 9} }; System.out.println("The matrix is defined as: "); for (int i = 0; i < matrix_size; i++) { for (int j = 0; j < matrix_size; j++) { System.out.print(input_matrix[i][j] + " "); } System.out.println(); } interchange_diagonals(input_matrix); } }
Output
The matrix is defined as: 4 5 6 1 2 3 7 8 9 The matrix after interchanging the elements: 6 5 4 1 2 3 9 8 7
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