# Interchange the diagonal of a matrix in scala Scala program for Interchange the diagonal of a matrix. Here mentioned other language solution.

``````/*
Scala program for
Swap diagonal elements of matrix using recursion
*/
class Exchange()
{
// Method which are perform swap operation
// Here x and y indicate start and end rows
// p and q indicates start and end columns
def swapDiagonal(matrix: Array[Array[Int]],
x: Int, y: Int, p: Int, q: Int): Unit = {
if (x >= y || p >= q)
{
return;
}
var temp: Int = matrix(x)(p);
// Swap the element value
matrix(x)(p) = matrix(x)(q);
matrix(x)(q) = temp;
temp = matrix(y)(p);
// Swap the element value
matrix(y)(p) = matrix(y)(q);
matrix(y)(q) = temp;
swapDiagonal(matrix, x + 1, y - 1, p + 1, q - 1);
}
// Display matrix elements
def showMatrix(matrix: Array[Array[Int]], size: Int): Unit = {
var i: Int = 0;
// iterate rows
while (i < size)
{
var j: Int = 0;
// iterate columns
while (j < size)
{
// Display element value
print("  " + matrix(i)(j));
j += 1;
}
//  include new line
println();
i += 1;
}
// include new line
println();
}
}
object Main
{
def main(args: Array[String]): Unit = {
// Define matrix element
var matrix: Array[Array[Int]] = Array(
Array(1, 2, 3, 4),
Array(5, 6, 7, 8),
Array(9, 10, 11, 12),
Array(13, 14, 15, 16)
);
// Assume N X N matrix
var n: Int = matrix.length;
// Display element
// interchange request
task.swapDiagonal(matrix, 0, n - 1, 0, n - 1);
// Display element
}
}``````

Output

``````  1  2  3  4
5  6  7  8
9  10  11  12
13  14  15  16

4  2  3  1
5  7  6  8
9  11  10  12
16  14  15  13
``````

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