## Archive for June, 2013

Input  : Number of Rows

Output:

1
121
12321
1234321
123454321

Code

```        public static void PrintNumberPattern2(int rows)
{
int i, j, k;
//Loop for number of Rows
for (i = 1; i <= rows; i++)
{
// Loop for printing numbers in increasing order
for (j = 1; j < 2 * i + 1; j++)
{
Console.Write(j);
if (j >= i)
{
break;
}
}
// Loop for printing numbers in decreasing order
for (k = j - 1; k > 0; k--)
{
Console.Write(k);
}
Console.WriteLine("");
}
}```

Today we have to write a program for rotating a given matrix by 90 degree. This code only works with square matrix.

Code

```        public static void MatrixRotation<T>(T[,] matrix)
{
Console.WriteLine("\n Input Matrix");
Print2DMatrix(matrix);
int row = matrix.GetLength(0);
int column = matrix.GetLength(1);

T temp;
for (int i = 0; i < row; i++)
{
for (int j = i + 1; j < column; j++)
{
temp = matrix[j, i];
matrix[j, i] = matrix[i, j];
matrix[i, j] = temp;
}
}

for (int i = 0; i < row / 2; i++)
{
for (int j = 0; j < column; j++)
{
temp = matrix[j, i];
matrix[j, i] = matrix[j, row - i - 1];
matrix[j, row - i - 1] = temp;
}
}
Console.WriteLine("\n Rotation matrix");
Print2DMatrix(matrix);

}

private static void Print2DMatrix<T>(T[,] matrix)
{
Console.WriteLine("--------------\n");
int row = matrix.GetLength(0);
int column = matrix.GetLength(1);

for (int i = 0; i < row; i++)
{
for (int j = 0; j < column; j++)
{
Console.Write(matrix[i, j] + " ");
}
Console.WriteLine(" ");
}

}```

Result

Input Matrix

————–

11 12 13 14 15

21 22 23 24 25

31 32 33 34 35

41 42 43 44 45

51 52 53 54 55

Rotation matrix

————–

51 41 31 21 11

52 42 32 22 12

53 43 33 23 13

54 44 34 24 14

55 45 35 25 15

Input Matrix

————–

A B C D

E F G H

I J K L

M N O P

Rotation matrix

————–

M I E A

N J F B

O K G C

P L H D