Java Program to Interchange Any Two Rows and Columns in the Matrix

This is a Java Program to Interchange any two Rows & Columns in the given Matrix.

Enter the elements of array as input. Now select the option whether you want to interchange rows or columns. We use loops to interchange columns or rows respectively.

Here is the source code of the Java Program to Interchange any two Rows & Columns in the given Matrix. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

```
import java.util.Scanner;
```
```
public class Interchange 
```
```
{
```

    public static void main(String[] args)

```
    {
```

        int p, q, n, x , y, temp = 0, k = 0;

        Scanner s = new Scanner(System.in);

        System.out.print("Enter number of rows in matrix:");

```
        p = s.nextInt();
```

        System.out.print("Enter number of columns in matrix:");

```
        q = s.nextInt();
```
```
        int a[][] = new int[p][q];
```

        System.out.println("Enter all the elements of matrix:");

```
        for (int i = 0; i < p; i++) 
```
```
        {
```

            for (int j = 0; j < q; j++)

```
            {
```
```
                a[i][j] = s.nextInt();
```
```
            }
```
```
        }
```

        System.out.println("Given Matrix:");

```
        for (int i = 0; i < p; i++) 
```
```
        {
```

            for (int j = 0; j < q; j++)

```
            {
```

                System.out.print(a[i][j] + " ");

```
            }
```
```
            System.out.println("");
```
```
        }
```
```
        while (true) 
```
```
        {
```

            System.out.println("Enter 1 to interchange rows");

            System.out.println("Enter 2 to interchange columns");

            System.out.println("Enter 3 to Exit");

```
            n=s.nextInt();
```
```
            switch (n) 
```
```
            {
```
```
                case 1:
```

                System.out.println("Enter the row numbers:");

```
                x = s.nextInt();
```
```
                y = s.nextInt();
```

                for(int i = 0; i < p; i++)

```
                {
```
```
                    temp = a[(x-1)][i];
```

                    a[x-1][i] = a[y-1][i];

```
                    a[y-1][i] = temp;
```
```
                }
```

                System.out.println("Matrix after interchanging rows:"+x +" and "+y);

                for (int i = 0; i < p; i++)

```
                {
```

                    for (int j = 0; j < q; j++)

```
                    {
```

                        System.out.print(a[i][j] + " ");

```
                    }
```
```
                System.out.println("");
```
```
                }
```
```
                break;
```
```
                case 2:
```

                System.out.println("Enter the column numbers:");

```
                x = s.nextInt();
```
```
                y = s.nextInt();
```

                for(int i = 0; i < p; i++)

```
                {
```
```
                    temp = a[i][(x-1)];
```

                    a[i][x-1] = a[i][(y-1)];

```
                    a[i][y-1] = temp;
```
```
                }
```

                System.out.println("Matrix after interchanging columns:"+x +" and "+y);

                for (int i = 0; i < p; i++)

```
                {
```

                    for (int j = 0; j < q; j++)

```
                    {
```

                        System.out.print(a[i][j] + " ");

```
                    }
```
```
                System.out.println("");
```
```
                }
```
```
                break;
```
```
          	case 3:
```
```
                System.exit(0);
```
```
            }
```
```
        }
```
```
    }
```
```
}
```

Output:

$ javac Interchange.java
$ java Interchange 
 
Enter number of rows in matrix:3
Enter number of columns in matrix:3
Enter all the elements of matrix:
1
2
3
4
5
6
7
8
9
Given Matrix:
1 2 3 
4 5 6 
7 8 9 
Enter 1 to interchange rows
Enter 2 to interchange columns
Enter 3 to Exit
1
Enter the row numbers:
2
3
Matrix after interchanging rows:2 and 3
1 2 3 
7 8 9 
4 5 6 
Enter 1 to interchange rows
Enter 2 to interchange columns
Enter 3 to Exit
2
Enter the column numbers:
1
2
Matrix after interchanging columns:1 and 2
2 1 3 
8 7 9 
5 4 6 
Enter 1 to interchange rows
Enter 2 to interchange columns
Enter 3 to Exit
3

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