Inplace rotate square matrix by 90 degrees

Here given code implementation process.

/*
    C Program 
    Inplace rotate square matrix by 90 degrees
*/
#include <stdio.h>

#define SIZE 6
//Rotate the square matrix element in 90 degrees
void rotate_90_degree(int matrix[SIZE][SIZE])
{
    //Define loop control variables
    int i = 1;
    int j = 0;
    int temp = 0;
    // Diagonal transform the elements of upper triangular matrix
    // Example
    /*
        /  /  / 
       /  /      Upper Triangular
      /
      ------------

      1   2   3
      4   5      Element Like this
      6
      -------------  


      1   4   6
      2   5       After transform
      3
      -------------  

    */
    for (i = 1; i < SIZE; ++i)
    {
        j = 0;
        while (j < i)
        {
            temp = matrix[j][i - j];
            matrix[j][i - j] = matrix[i - j][j];
            matrix[i - j][j] = temp;
            j++;
        }
    }
    // Diagonal transform the elements of lower triangular matrix
    // Example
    /*
        /
       /  /  
      /  /  /   Lower Triangular
      -------

            1   
         2  3   Element Like this
      4  5  6 
     
      -------------  

            4  
         2  5   After transform
      1  3  6 
      -------------  

    */
    for (i = 1; i < SIZE - 1; ++i)
    {
        j = 0;
        while (j < i)
        {
            temp = matrix[i - j][(SIZE - 1) - j];
            matrix[i - j][(SIZE - 1) - j] = matrix[(SIZE - 1) - j][i - j];
            matrix[(SIZE - 1) - j][i - j] = temp;
            j++;
        }
    }
    // Invert column values
    /*
        |  |  |  |
        |  |  |  |  pattern
        |  |  |  |
        |  |  |  |
     
      -------

        1   5   9   13
        2   6   10  14  Element Like this
        3   7   11  15
        4   9   12  16
      -------------  

        4   9   12  16
        3   7   11  15  After transform
        2   6   10  14
        1   5   9   13
      -------------  

    */
    for (i = 0; i < SIZE; ++i)
    {
        for (j = 0; j < SIZE / 2; ++j)
        {
            temp = matrix[j][i];
            matrix[j][i] = matrix[(SIZE - 1) - j][i];
            matrix[(SIZE - 1) - j][i] = temp;
        }
    }
}
//Display matrix elements
void show_data(int matrix[SIZE][SIZE])
{
    int i = 0;
    int j = 0;
    for (i = 0; i < SIZE; ++i)
    {
        for (j = 0; j < SIZE; ++j)
        {
            printf("%3d", matrix[i][j]);
        }
        printf("\n");
    }
    printf("\n");
}
int main()
{
    int matrix[SIZE][SIZE] = 
    {
        {
            1 , 2 , 3 , 4 , 5 , 6
        } ,
        {
            7 , 8 , 9 , 10 , 11 , 12
        } ,
        {
            13 , 14 , 15 , 16 , 17 , 18
        } ,
        {
            19 , 20 , 21 , 22 , 23 , 24
        } ,
        {
            25 , 26 , 27 , 28 , 29 , 30
        } ,
        {
            31 , 32 , 33 , 34 , 35 , 36
        }
    };
    printf("\n Before rotate \n");
    show_data(matrix);
    rotate_90_degree(matrix);
    printf("\n After rotate \n");
    show_data(matrix);
    return 0;
}

Output

 Before rotate
  1  2  3  4  5  6
  7  8  9 10 11 12
 13 14 15 16 17 18
 19 20 21 22 23 24
 25 26 27 28 29 30
 31 32 33 34 35 36


 After rotate
  6 12 18 24 30 36
  5 11 17 23 29 35
  4 10 16 22 28 34
  3  9 15 21 27 33
  2  8 14 20 26 32
  1  7 13 19 25 31
/*
    Java Program 
    Inplace rotate square matrix by 90 degrees
*/


public class MyMatrix
{
    //Rotate the square matrix element in 90 degrees
    public void rotate_90_degree(int [][]matrix,int size)
    {
        //Define loop control variables
        int i = 1;
        int j = 0;
        int temp = 0;
        // Diagonal transform the elements of upper triangular matrix
        // Example
        /*
                /  /  / 
               /  /      Upper Triangular
              /
              ------------

              1   2   3
              4   5      Element Like this
              6
              -------------  


              1   4   6
              2   5       After transform
              3
              -------------  

            */
        for (i = 1; i < size; ++i)
        {
            j = 0;
            while (j < i)
            {
                temp = matrix[j][i - j];
                matrix[j][i - j] = matrix[i - j][j];
                matrix[i - j][j] = temp;
                j++;
            }
        }
        // Diagonal transform the elements of lower triangular matrix
        // Example
        /*
                /
               /  /  
              /  /  /   Lower Triangular
              -------

                    1   
                 2  3   Element Like this
              4  5  6 
             
              -------------  

                    4  
                 2  5   After transform
              1  3  6 
              -------------  

            */
        for (i = 1; i < size - 1; ++i)
        {
            j = 0;
            while (j < i)
            {
                temp = matrix[i - j][(size - 1) - j];
                matrix[i - j][(size - 1) - j] = matrix[(size - 1) - j][i - j];
                matrix[(size - 1) - j][i - j] = temp;
                j++;
            }
        }
        // Invert column values
        /*
            |  |  |  |
            |  |  |  |  pattern
            |  |  |  |
            |  |  |  |
         
            -------

            1   5   9   13
            2   6   10  14  Element Like this
            3   7   11  15
            4   9   12  16
            -------------  

            4   9   12  16
            3   7   11  15  After transform
            2   6   10  14
            1   5   9   13
            -------------  

        */
        for (i = 0; i < size; ++i)
        {
            for (j = 0; j < size / 2; ++j)
            {
                temp = matrix[j][i];
                matrix[j][i] = matrix[(size - 1) - j][i];
                matrix[(size - 1) - j][i] = temp;
            }
        }
    }
    //Display matrix elements
    public void show_data(int[][] matrix,int size)
    {
        int i = 0;
        int j = 0;
        for (i = 0; i < size; ++i)
        {
            for (j = 0; j < size; ++j)
            {
                System.out.print("  " + matrix[i][j] );
            }
            System.out.print("\n");
        }
        System.out.print("\n");
    }
       
    public static void main(String[] args)
    {
       
        MyMatrix obj = new MyMatrix();

        int[][] matrix =  {
            {
                1 , 2 , 3 , 4 , 5 , 6
            } , {
                7 , 8 , 9 , 10 , 11 , 12
            } , {
                13 , 14 , 15 , 16 , 17 , 18
            } , {
                19 , 20 , 21 , 22 , 23 , 24
            } , {
                25 , 26 , 27 , 28 , 29 , 30
            } , {
                31 , 32 , 33 , 34 , 35 , 36
            }
        };

        int size = matrix[0].length;
        System.out.print("\n Before rotate \n");
        obj.show_data(matrix,size);
        obj.rotate_90_degree(matrix,size);
        System.out.print("\n After rotate \n");
        obj.show_data(matrix,size);
    }
}

Output

 Before rotate
  1  2  3  4  5  6
  7  8  9  10  11  12
  13  14  15  16  17  18
  19  20  21  22  23  24
  25  26  27  28  29  30
  31  32  33  34  35  36


 After rotate
  6  12  18  24  30  36
  5  11  17  23  29  35
  4  10  16  22  28  34
  3  9  15  21  27  33
  2  8  14  20  26  32
  1  7  13  19  25  31
// Include header file
#include <iostream>
#define SIZE  6
using namespace std;
/*
    C++ Program 
    Inplace rotate square matrix by 90 degrees
*/
class MyMatrix
{
	public:
		// Rotate the square matrix element in 90 degrees
		void rotate_90_degree(int matrix[SIZE][SIZE])
		{
			// Define loop control variables
			int i = 1;
			int j = 0;
			int temp = 0;
			/*
			        Diagonal transform the elements of upper triangular matrix
			        Example
			        ----------------------------

			            /  /  / 
			           /  /      Upper Triangular
			          /
			        ----------------------------

			          1   2   3
			          4   5      Element Like this
			          6
			        -----------------------------


			          1   4   6
			          2   5       After transform
			          3
			        --------------------------------

			        */
			for (i = 1; i < SIZE; ++i)
			{
				j = 0;
				while (j < i)
				{
					temp = matrix[j][i - j];
					matrix[j][i - j] = matrix[i - j][j];
					matrix[i - j][j] = temp;
					j++;
				}
			}
			/*
			        // Diagonal transform the elements of lower triangular matrix
			        // Example
			        ---------------------------
			            /
			           /  /  
			          /  /  /   Lower Triangular
			          ---------------------------

			                1   
			             2  3   Element Like this
			          4  5  6 
			         
			          ------------------------------ 

			                4  
			             2  5   After transform
			          1  3  6 
			          ------------------------------  

			        */
			for (i = 1; i < SIZE - 1; ++i)
			{
				j = 0;
				while (j < i)
				{
					temp = matrix[i - j][(SIZE - 1) - j];
					matrix[i - j][(SIZE - 1) - j] = matrix[(SIZE - 1) - j][i - j];
					matrix[(SIZE - 1) - j][i - j] = temp;
					j++;
				}
			}
			/*
			        Invert column values

			            |  |  |  |
			            |  |  |  |  pattern
			            |  |  |  |
			            |  |  |  |
			         
			            -------

			            1   5   9   13
			            2   6   10  14  Element Like this
			            3   7   11  15
			            4   9   12  16
			            -------------  

			            4   9   12  16
			            3   7   11  15  After transform
			            2   6   10  14
			            1   5   9   13
			            -------------  

			        */
			for (i = 0; i < SIZE; ++i)
			{
				for (j = 0; j < SIZE / 2; ++j)
				{
					temp = matrix[j][i];
					matrix[j][i] = matrix[(SIZE - 1) - j][i];
					matrix[(SIZE - 1) - j][i] = temp;
				}
			}
		}
	// Display matrix elements
	void show_data(int matrix[SIZE][SIZE])
	{
		int i = 0;
		int j = 0;
		for (i = 0; i < SIZE; ++i)
		{
			for (j = 0; j < SIZE; ++j)
			{
				cout << "  " << matrix[i][j];
			}
			cout << "\n";
		}
		cout << "\n";
	}
};
int main()
{
	MyMatrix obj = MyMatrix();
	int matrix[SIZE][SIZE] = {
		{
			1 , 2 , 3 , 4 , 5 , 6
		} , {
			7 , 8 , 9 , 10 , 11 , 12
		} , {
			13 , 14 , 15 , 16 , 17 , 18
		} , {
			19 , 20 , 21 , 22 , 23 , 24
		} , {
			25 , 26 , 27 , 28 , 29 , 30
		} , {
			31 , 32 , 33 , 34 , 35 , 36
		}
	};

	cout << "\n Before rotate \n";
	obj.show_data(matrix);
	obj.rotate_90_degree(matrix);
	cout << "\n After rotate \n";
	obj.show_data(matrix);
	return 0;
}

Output

 Before rotate
  1  2  3  4  5  6
  7  8  9  10  11  12
  13  14  15  16  17  18
  19  20  21  22  23  24
  25  26  27  28  29  30
  31  32  33  34  35  36


 After rotate
  6  12  18  24  30  36
  5  11  17  23  29  35
  4  10  16  22  28  34
  3  9  15  21  27  33
  2  8  14  20  26  32
  1  7  13  19  25  31
// Include namespace system
using System;
/*
    C# Program 
    Inplace rotate square matrix by 90 degrees
*/
public class MyMatrix
{
	// Rotate the square matrix element in 90 degrees
	public void rotate_90_degree(int[,] matrix, int size)
	{
		// Define loop control variables
		int i = 1;
		int j = 0;
		int temp = 0;
		/*
		        Diagonal transform the elements of upper triangular matrix
		        Example
		        ----------------------------

		            /  /  / 
		           /  /      Upper Triangular
		          /
		        ----------------------------

		          1   2   3
		          4   5      Element Like this
		          6
		        -----------------------------


		          1   4   6
		          2   5       After transform
		          3
		        --------------------------------

		        */
		for (i = 1; i < size; ++i)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix[j,i - j];
				matrix[j,i - j] = matrix[i - j,j];
				matrix[i - j,j] = temp;
				j++;
			}
		}
		/*
		        // Diagonal transform the elements of lower triangular matrix
		        // Example
		        ---------------------------
		            /
		           /  /  
		          /  /  /   Lower Triangular
		          ---------------------------

		                1   
		             2  3   Element Like this
		          4  5  6 
		         
		          ------------------------------ 

		                4  
		             2  5   After transform
		          1  3  6 
		          ------------------------------  

		        */
		for (i = 1; i < size - 1; ++i)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix[i - j,(size - 1) - j];
				matrix[i - j,(size - 1) - j] = matrix[(size - 1) - j,i - j];
				matrix[(size - 1) - j,i - j] = temp;
				j++;
			}
		}
		/*
		        Invert column values

		            |  |  |  |
		            |  |  |  |  pattern
		            |  |  |  |
		            |  |  |  |
		         
		            -------

		            1   5   9   13
		            2   6   10  14  Element Like this
		            3   7   11  15
		            4   9   12  16
		            -------------  

		            4   9   12  16
		            3   7   11  15  After transform
		            2   6   10  14
		            1   5   9   13
		            -------------  

		        */
		for (i = 0; i < size; ++i)
		{
			for (j = 0; j < size / 2; ++j)
			{
				temp = matrix[j,i];
				matrix[j,i] = matrix[(size - 1) - j,i];
				matrix[(size - 1) - j,i] = temp;
			}
		}
	}
	// Display matrix elements
	public void show_data(int[,] matrix, int size)
	{
		int i = 0;
		int j = 0;
		for (i = 0; i < size; ++i)
		{
			for (j = 0; j < size; ++j)
			{
				Console.Write("  " + matrix[i,j]);
			}
			Console.Write("\n");
		}
		Console.Write("\n");
	}
	public static void Main(String[] args)
	{
		MyMatrix obj = new MyMatrix();
		int[,] matrix = {
			{
				1 , 2 , 3 , 4 , 5 , 6
			} , {
				7 , 8 , 9 , 10 , 11 , 12
			} , {
				13 , 14 , 15 , 16 , 17 , 18
			} , {
				19 , 20 , 21 , 22 , 23 , 24
			} , {
				25 , 26 , 27 , 28 , 29 , 30
			} , {
				31 , 32 , 33 , 34 , 35 , 36
			}
		};
		int size = matrix.GetLength(0);
		Console.Write("\n Before rotate \n");
		obj.show_data(matrix, size);
		obj.rotate_90_degree(matrix, size);
		Console.Write("\n After rotate \n");
		obj.show_data(matrix, size);
	}
}

Output

 Before rotate
  1  2  3  4  5  6
  7  8  9  10  11  12
  13  14  15  16  17  18
  19  20  21  22  23  24
  25  26  27  28  29  30
  31  32  33  34  35  36


 After rotate
  6  12  18  24  30  36
  5  11  17  23  29  35
  4  10  16  22  28  34
  3  9  15  21  27  33
  2  8  14  20  26  32
  1  7  13  19  25  31
<?php
/*
    Php Program 
    Inplace rotate square matrix by 90 degrees
*/
class MyMatrix
{
	// Rotate the square matrix element in 90 degrees
	public	function rotate_90_degree( & $matrix, $size)
	{
		// Define loop control variables
		$i = 1;
		$j = 0;
		$temp = 0;
		/*
		        Diagonal transform the elements of upper triangular matrix
		        Example
		        ----------------------------

		            /  /  / 
		           /  /      Upper Triangular
		          /
		        ----------------------------

		          1   2   3
		          4   5      Element Like this
		          6
		        -----------------------------


		          1   4   6
		          2   5       After transform
		          3
		        --------------------------------

		        */
		for ($i = 1; $i < $size; ++$i)
		{
			$j = 0;
			while ($j < $i)
			{
				$temp = $matrix[$j][$i - $j];
				$matrix[$j][$i - $j] = $matrix[$i - $j][$j];
				$matrix[$i - $j][$j] = $temp;
				$j++;
			}
		}
		/*
		        // Diagonal transform the elements of lower triangular matrix
		        // Example
		        ---------------------------
		            /
		           /  /  
		          /  /  /   Lower Triangular
		          ---------------------------

		                1   
		             2  3   Element Like this
		          4  5  6 
		         
		          ------------------------------ 

		                4  
		             2  5   After transform
		          1  3  6 
		          ------------------------------  

		        */
		for ($i = 1; $i < $size - 1; ++$i)
		{
			$j = 0;
			while ($j < $i)
			{
				$temp = $matrix[$i - $j][($size - 1) - $j];
				$matrix[$i - $j][($size - 1) - $j] = $matrix[($size - 1) - $j][$i - $j];
				$matrix[($size - 1) - $j][$i - $j] = $temp;
				$j++;
			}
		}
		/*
		        Invert column values

		            |  |  |  |
		            |  |  |  |  pattern
		            |  |  |  |
		            |  |  |  |
		         
		            -------

		            1   5   9   13
		            2   6   10  14  Element Like this
		            3   7   11  15
		            4   9   12  16
		            -------------  

		            4   9   12  16
		            3   7   11  15  After transform
		            2   6   10  14
		            1   5   9   13
		            -------------  

		        */
		for ($i = 0; $i < $size; ++$i)
		{
			for ($j = 0; $j < intval($size / 2); ++$j)
			{
				$temp = $matrix[$j][$i];
				$matrix[$j][$i] = $matrix[($size - 1) - $j][$i];
				$matrix[($size - 1) - $j][$i] = $temp;
			}
		}
	}
	// Display matrix elements
	public	function show_data( & $matrix, $size)
	{
		$i = 0;
		$j = 0;
		for ($i = 0; $i < $size; ++$i)
		{
			for ($j = 0; $j < $size; ++$j)
			{
				echo "  ". $matrix[$i][$j];
			}
			echo "\n";
		}
		echo "\n";
	}
}

function main()
{
	$obj = new MyMatrix();
	$matrix = array(
      array(1, 2, 3, 4, 5, 6), 
      array(7, 8, 9, 10, 11, 12), 
      array(13, 14, 15, 16, 17, 18), 
      array(19, 20, 21, 22, 23, 24), 
      array(25, 26, 27, 28, 29, 30), 
      array(31, 32, 33, 34, 35, 36));
	$size = count($matrix[0]);
	echo "\n Before rotate \n";
	$obj->show_data($matrix, $size);
	$obj->rotate_90_degree($matrix, $size);
	echo "\n After rotate \n";
	$obj->show_data($matrix, $size);
}
main();

Output

 Before rotate
  1  2  3  4  5  6
  7  8  9  10  11  12
  13  14  15  16  17  18
  19  20  21  22  23  24
  25  26  27  28  29  30
  31  32  33  34  35  36


 After rotate
  6  12  18  24  30  36
  5  11  17  23  29  35
  4  10  16  22  28  34
  3  9  15  21  27  33
  2  8  14  20  26  32
  1  7  13  19  25  31
/*
    Node Js Program 
    Inplace rotate square matrix by 90 degrees
*/
class MyMatrix
{
	// Rotate the square matrix element in 90 degrees
	rotate_90_degree(matrix, size)
	{
		// Define loop control variables
		var i = 1;
		var j = 0;
		var temp = 0;
		/*
		        Diagonal transform the elements of upper triangular matrix
		        Example
		        ----------------------------

		            /  /  / 
		           /  /      Upper Triangular
		          /
		        ----------------------------

		          1   2   3
		          4   5      Element Like this
		          6
		        -----------------------------


		          1   4   6
		          2   5       After transform
		          3
		        --------------------------------

		        */
		for (i = 1; i < size; ++i)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix[j][i - j];
				matrix[j][i - j] = matrix[i - j][j];
				matrix[i - j][j] = temp;
				j++;
			}
		}
		/*
		        // Diagonal transform the elements of lower triangular matrix
		        // Example
		        ---------------------------
		            /
		           /  /  
		          /  /  /   Lower Triangular
		          ---------------------------

		                1   
		             2  3   Element Like this
		          4  5  6 
		         
		          ------------------------------ 

		                4  
		             2  5   After transform
		          1  3  6 
		          ------------------------------  

		        */
		for (i = 1; i < size - 1; ++i)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix[i - j][(size - 1) - j];
				matrix[i - j][(size - 1) - j] = matrix[(size - 1) - j][i - j];
				matrix[(size - 1) - j][i - j] = temp;
				j++;
			}
		}
		/*
		        Invert column values

		            |  |  |  |
		            |  |  |  |  pattern
		            |  |  |  |
		            |  |  |  |
		         
		            -------

		            1   5   9   13
		            2   6   10  14  Element Like this
		            3   7   11  15
		            4   9   12  16
		            -------------  

		            4   9   12  16
		            3   7   11  15  After transform
		            2   6   10  14
		            1   5   9   13
		            -------------  

		        */
		for (i = 0; i < size; ++i)
		{
			for (j = 0; j < parseInt(size / 2); ++j)
			{
				temp = matrix[j][i];
				matrix[j][i] = matrix[(size - 1) - j][i];
				matrix[(size - 1) - j][i] = temp;
			}
		}
	}
	// Display matrix elements
	show_data(matrix, size)
	{
		var i = 0;
		var j = 0;
		for (i = 0; i < size; ++i)
		{
			for (j = 0; j < size; ++j)
			{
				process.stdout.write("  " + matrix[i][j]);
			}
			process.stdout.write("\n");
		}
		process.stdout.write("\n");
	}
}

function main()
{
	var obj = new MyMatrix();
	var matrix = [
		[1, 2, 3, 4, 5, 6] , 
        [7, 8, 9, 10, 11, 12] , 
        [13, 14, 15, 16, 17, 18] , 
        [19, 20, 21, 22, 23, 24] , 
        [25, 26, 27, 28, 29, 30] , 
        [31, 32, 33, 34, 35, 36]
	];
	var size = matrix[0].length;
	process.stdout.write("\n Before rotate \n");
	obj.show_data(matrix, size);
	obj.rotate_90_degree(matrix, size);
	process.stdout.write("\n After rotate \n");
	obj.show_data(matrix, size);
}
main();

Output

 Before rotate
  1  2  3  4  5  6
  7  8  9  10  11  12
  13  14  15  16  17  18
  19  20  21  22  23  24
  25  26  27  28  29  30
  31  32  33  34  35  36


 After rotate
  6  12  18  24  30  36
  5  11  17  23  29  35
  4  10  16  22  28  34
  3  9  15  21  27  33
  2  8  14  20  26  32
  1  7  13  19  25  31
#  Python 3 Program 
#  Inplace rotate square matrix by 90 degrees

class MyMatrix :
	#  Rotate the square matrix element in 90 degrees
	def rotate_90_degree(self, matrix, size) :
		#  Define loop control variables
		i = 1
		j = 0
		temp = 0
		# 
		#        Diagonal transform the elements of upper triangular matrix
		#        Example
		#        ----------------------------
		#            /  /  / 
		#           /  /      Upper Triangular
		#          /
		#        ----------------------------
		#          1   2   3
		#          4   5      Element Like this
		#          6
		#        -----------------------------
		#          1   4   6
		#          2   5       After transform
		#          3
		#        --------------------------------
		#         
		
		i = 1
		while (i < size) :
			j = 0
			while (j < i) :
				temp = matrix[j][i - j]
				matrix[j][i - j] = matrix[i - j][j]
				matrix[i - j][j] = temp
				j += 1
			
			i += 1
		
		# 
		#         Diagonal transform the elements of lower triangular matrix
		#         Example
		#         ---------------------------
		#             /
		#            /  /  
		#           /  /  /   Lower Triangular
		#           ---------------------------
		#                 1   
		#              2  3   Element Like this
		#           4  5  6 
		#          
		#           ------------------------------ 
		#                 4  
		#              2  5   After transform
		#           1  3  6 
		#           ------------------------------  
		#         
		
		i = 1
		while (i < size - 1) :
			j = 0
			while (j < i) :
				temp = matrix[i - j][(size - 1) - j]
				matrix[i - j][(size - 1) - j] = matrix[(size - 1) - j][i - j]
				matrix[(size - 1) - j][i - j] = temp
				j += 1
			
			i += 1
		
		# 
		#         Invert column values
		#             |  |  |  |
		#             |  |  |  |  pattern
		#             |  |  |  |
		#             |  |  |  |
		#          
		#             -------
		#             1   5   9   13
		#             2   6   10  14  Element Like this
		#             3   7   11  15
		#             4   9   12  16
		#             -------------  
		#             4   9   12  16
		#             3   7   11  15  After transform
		#             2   6   10  14
		#             1   5   9   13
		#             -------------  
		#         
		
		i = 0
		while (i < size) :
			j = 0
			while (j < int(size / 2)) :
				temp = matrix[j][i]
				matrix[j][i] = matrix[(size - 1) - j][i]
				matrix[(size - 1) - j][i] = temp
				j += 1
			
			i += 1
		
	
	#  Display matrix elements
	def show_data(self, matrix, size) :
		i = 0
		j = 0
		i = 0
		while (i < size) :
			j = 0
			while (j < size) :
				print("  ", matrix[i][j], end = "")
				j += 1
			
			print("\n", end = "")
			i += 1
		
		print("\n", end = "")
	

def main() :
	obj = MyMatrix()
	matrix = [
		[1, 2, 3, 4, 5, 6] , 
        [7, 8, 9, 10, 11, 12] , 
        [13, 14, 15, 16, 17, 18] , 
        [19, 20, 21, 22, 23, 24] , 
        [25, 26, 27, 28, 29, 30] , 
        [31, 32, 33, 34, 35, 36]
	]
	size = len(matrix[0])
	print("\n Before rotate \n", end = "")
	obj.show_data(matrix, size)
	obj.rotate_90_degree(matrix, size)
	print("\n After rotate \n", end = "")
	obj.show_data(matrix, size)

if __name__ == "__main__": main()

Output

 Before rotate
   1   2   3   4   5   6
   7   8   9   10   11   12
   13   14   15   16   17   18
   19   20   21   22   23   24
   25   26   27   28   29   30
   31   32   33   34   35   36


 After rotate
   6   12   18   24   30   36
   5   11   17   23   29   35
   4   10   16   22   28   34
   3   9   15   21   27   33
   2   8   14   20   26   32
   1   7   13   19   25   31
# 
#     Ruby Program 
#     Inplace rotate square matrix by 90 degrees

class MyMatrix 
	#  Rotate the square matrix element in 90 degrees
	def rotate_90_degree(matrix, size) 
		#  Define loop control variables
		i = 1
		j = 0
		temp = 0
		# 
		#        Diagonal transform the elements of upper triangular matrix
		#        Example
		#        ----------------------------
		#            /  /  / 
		#           /  /      Upper Triangular
		#          /
		#        ----------------------------
		#          1   2   3
		#          4   5      Element Like this
		#          6
		#        -----------------------------
		#          1   4   6
		#          2   5       After transform
		#          3
		#        --------------------------------
		#         
		
		i = 1
		while (i < size) 
			j = 0
			while (j < i) 
				temp = matrix[j][i - j]
				matrix[j][i - j] = matrix[i - j][j]
				matrix[i - j][j] = temp
				j += 1
			end

			i += 1
		end

		# 
		#         // Diagonal transform the elements of lower triangular matrix
		#         // Example
		#         ---------------------------
		#             /
		#            /  /  
		#           /  /  /   Lower Triangular
		#           ---------------------------
		#                 1   
		#              2  3   Element Like this
		#           4  5  6 
		#          
		#           ------------------------------ 
		#                 4  
		#              2  5   After transform
		#           1  3  6 
		#           ------------------------------  
		#         
		
		i = 1
		while (i < size - 1) 
			j = 0
			while (j < i) 
				temp = matrix[i - j][(size - 1) - j]
				matrix[i - j][(size - 1) - j] = matrix[(size - 1) - j][i - j]
				matrix[(size - 1) - j][i - j] = temp
				j += 1
			end

			i += 1
		end

		# 
		#         Invert column values
		#             |  |  |  |
		#             |  |  |  |  pattern
		#             |  |  |  |
		#             |  |  |  |
		#          
		#             -------
		#             1   5   9   13
		#             2   6   10  14  Element Like this
		#             3   7   11  15
		#             4   9   12  16
		#             -------------  
		#             4   9   12  16
		#             3   7   11  15  After transform
		#             2   6   10  14
		#             1   5   9   13
		#             -------------  
		#         
		
		i = 0
		while (i < size) 
			j = 0
			while (j < size / 2) 
				temp = matrix[j][i]
				matrix[j][i] = matrix[(size - 1) - j][i]
				matrix[(size - 1) - j][i] = temp
				j += 1
			end

			i += 1
		end

	end

	#  Display matrix elements
	def show_data(matrix, size) 
		i = 0
		j = 0
		i = 0
		while (i < size) 
			j = 0
			while (j < size) 
				print("  ", matrix[i][j])
				j += 1
			end

			print("\n")
			i += 1
		end

		print("\n")
	end

end

def main() 
	obj = MyMatrix.new()
	matrix = [
		[1, 2, 3, 4, 5, 6] , 
        [7, 8, 9, 10, 11, 12] , 
        [13, 14, 15, 16, 17, 18] ,
        [19, 20, 21, 22, 23, 24] ,
        [25, 26, 27, 28, 29, 30] ,
        [31, 32, 33, 34, 35, 36]
	]
	size = matrix[0].length
	print("\n Before rotate \n")
	obj.show_data(matrix, size)
	obj.rotate_90_degree(matrix, size)
	print("\n After rotate \n")
	obj.show_data(matrix, size)
end

main()

Output

 Before rotate 
  1  2  3  4  5  6
  7  8  9  10  11  12
  13  14  15  16  17  18
  19  20  21  22  23  24
  25  26  27  28  29  30
  31  32  33  34  35  36


 After rotate 
  6  12  18  24  30  36
  5  11  17  23  29  35
  4  10  16  22  28  34
  3  9  15  21  27  33
  2  8  14  20  26  32
  1  7  13  19  25  31

/*
    Scala Program 
    Inplace rotate square matrix by 90 degrees
*/
class MyMatrix
{
	//  Rotate the square matrix element in 90 degrees
	def rotate_90_degree(matrix: Array[Array[Int]], size: Int): Unit = {
		//  Define loop control variables
		var i: Int = 1;
		var j: Int = 0;
		var temp: Int = 0;
		/*
		       Diagonal transform the elements of upper triangular matrix
		       Example
		       ----------------------------

		           /  /  / 
		          /  /      Upper Triangular
		         /
		       ----------------------------

		         1   2   3
		         4   5      Element Like this
		         6
		       -----------------------------


		         1   4   6
		         2   5       After transform
		         3
		       --------------------------------

		        */
		i = 1;
		while (i < size)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix(j)(i - j);
				matrix(j)(i - j) = matrix(i - j)(j);
				matrix(i - j)(j) = temp;
				j += 1;
			}
			i += 1;
		}
		/*
		        // Diagonal transform the elements of lower triangular matrix
		        // Example
		        ---------------------------
		            /
		           /  /  
		          /  /  /   Lower Triangular
		          ---------------------------

		                1   
		             2  3   Element Like this
		          4  5  6 
		         
		          ------------------------------ 

		                4  
		             2  5   After transform
		          1  3  6 
		          ------------------------------  

		        */
		i = 1;
		while (i < size - 1)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix(i - j)((size - 1) - j);
				matrix(i - j)((size - 1) - j) = matrix((size - 1) - j)(i - j);
				matrix((size - 1) - j)(i - j) = temp;
				j += 1;
			}
			i += 1;
		}
		/*
		        Invert column values

		            |  |  |  |
		            |  |  |  |  pattern
		            |  |  |  |
		            |  |  |  |
		         
		            -------

		            1   5   9   13
		            2   6   10  14  Element Like this
		            3   7   11  15
		            4   9   12  16
		            -------------  

		            4   9   12  16
		            3   7   11  15  After transform
		            2   6   10  14
		            1   5   9   13
		            -------------  

		        */
		i = 0;
		while (i < size)
		{
			j = 0;
			while (j < (size / 2).toInt)
			{
				temp = matrix(j)(i);
				matrix(j)(i) = matrix((size - 1) - j)(i);
				matrix((size - 1) - j)(i) = temp;
				j += 1;
			}
			i += 1;
		}
	}
	//  Display matrix elements
	def show_data(matrix: Array[Array[Int]], size: Int): Unit = {
		var i: Int = 0;
		var j: Int = 0;
		i = 0;
		while (i < size)
		{
			j = 0;
			while (j < size)
			{
				print("  " + matrix(i)(j));
				j += 1;
			}
			print("\n");
			i += 1;
		}
		print("\n");
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var obj: MyMatrix = new MyMatrix();
		var matrix: Array[Array[Int]] = Array(
          Array(1, 2, 3, 4, 5, 6), 
          Array(7, 8, 9, 10, 11, 12), 
          Array(13, 14, 15, 16, 17, 18), 
          Array(19, 20, 21, 22, 23, 24), 
          Array(25, 26, 27, 28, 29, 30),
          Array(31, 32, 33, 34, 35, 36)
        );
		var size: Int = matrix(0).length;
		print("\n Before rotate \n");
		obj.show_data(matrix, size);
		obj.rotate_90_degree(matrix, size);
		print("\n After rotate \n");
		obj.show_data(matrix, size);
	}
}

Output

 Before rotate
  1  2  3  4  5  6
  7  8  9  10  11  12
  13  14  15  16  17  18
  19  20  21  22  23  24
  25  26  27  28  29  30
  31  32  33  34  35  36


 After rotate
  6  12  18  24  30  36
  5  11  17  23  29  35
  4  10  16  22  28  34
  3  9  15  21  27  33
  2  8  14  20  26  32
  1  7  13  19  25  31
/*
    Swift 4 Program 
    Inplace rotate square matrix by 90 degrees
*/
class MyMatrix
{
	//  Rotate the square matrix element in 90 degrees
	func rotate_90_degree(_ matrix: inout[[Int]], _ size: Int)
	{
		//  Define loop control variables
		var i: Int = 1;
		var j: Int = 0;
		var temp: Int = 0;
		/*
		      Diagonal transform the elements of upper triangular matrix
		      Example
		      ----------------------------

		          /  /  / 
		         /  /      Upper Triangular
		        /
		      ----------------------------

		        1   2   3
		        4   5      Element Like this
		        6
		      -----------------------------


		        1   4   6
		        2   5       After transform
		        3
		      --------------------------------

		       */
		i = 1;
		while (i < size)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix[j][i - j];
				matrix[j][i - j] = matrix[i - j][j];
				matrix[i - j][j] = temp;
				j += 1;
			}
			i += 1;
		}
		/*
		       // Diagonal transform the elements of lower triangular matrix
		       // Example
		       ---------------------------
		           /
		          /  /  
		         /  /  /   Lower Triangular
		         ---------------------------

		               1   
		            2  3   Element Like this
		         4  5  6 
		        
		         ------------------------------ 

		               4  
		            2  5   After transform
		         1  3  6 
		         ------------------------------  

		       */
		i = 1;
		while (i < size - 1)
		{
			j = 0;
			while (j < i)
			{
				temp = matrix[i - j][(size - 1) - j];
				matrix[i - j][(size - 1) - j] = matrix[(size - 1) - j][i - j];
				matrix[(size - 1) - j][i - j] = temp;
				j += 1;
			}
			i += 1;
		}
		/*
		       Invert column values

		           |  |  |  |
		           |  |  |  |  pattern
		           |  |  |  |
		           |  |  |  |
		        
		           -------

		           1   5   9   13
		           2   6   10  14  Element Like this
		           3   7   11  15
		           4   9   12  16
		           -------------  

		           4   9   12  16
		           3   7   11  15  After transform
		           2   6   10  14
		           1   5   9   13
		           -------------  

		       */
		i = 0;
		while (i < size)
		{
			j = 0;
			while (j < size / 2)
			{
				temp = matrix[j][i];
				matrix[j][i] = matrix[(size - 1) - j][i];
				matrix[(size - 1) - j][i] = temp;
				j += 1;
			}
			i += 1;
		}
	}
	//  Display matrix elements
	func show_data(_ matrix: [[Int]], _ size: Int)
	{
		var i: Int = 0;
		var j: Int = 0;
		i = 0;
		while (i < size)
		{
			j = 0;
			while (j < size)
			{
				print("  ", matrix[i][j], terminator: "");
				j += 1;
			}
			print("\n", terminator: "");
			i += 1;
		}
		print("\n", terminator: "");
	}
}
func main()
{
	let obj: MyMatrix = MyMatrix();
	var matrix: [[Int]] = [
		[1, 2, 3, 4, 5, 6] , 
        [7, 8, 9, 10, 11, 12] , 
        [13, 14, 15, 16, 17, 18] , 
        [19, 20, 21, 22, 23, 24] , 
        [25, 26, 27, 28, 29, 30] , 
        [31, 32, 33, 34, 35, 36]
	];
	let size: Int = matrix[0].count;
	print("\n Before rotate \n", terminator: "");
	obj.show_data(matrix, size);
	obj.rotate_90_degree(&matrix, size);
	print("\n After rotate \n", terminator: "");
	obj.show_data(matrix, size);
}
main();

Output

 Before rotate
   1   2   3   4   5   6
   7   8   9   10   11   12
   13   14   15   16   17   18
   19   20   21   22   23   24
   25   26   27   28   29   30
   31   32   33   34   35   36


 After rotate
   6   12   18   24   30   36
   5   11   17   23   29   35
   4   10   16   22   28   34
   3   9   15   21   27   33
   2   8   14   20   26   32
   1   7   13   19   25   31

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