# C# Program to Interchange the Rows of a Matrix

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This is a C# Program to interchange any 2 rows of a matrix.

Problem Description

This C# Program Interchanges any 2 Rows of a Matrix.

Problem Solution

Here the number of rows, columns and the elements of the matrix are obtained from the user along with the rows that have to be interchanged.

Program/Source Code

Here is source code of the C# Program to Interchange any 2 Rows of a Matrix. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

```/*
* C# Program to Interchange any 2 Rows of a Matrix
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
class interchangerow
{
int m, n;
int[,] a;
public interchangerow(int x, int y)
{
m = x;
n = y;
a = new int[m, n];
}
{
Console.WriteLine("Enter the Elements : ");
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
Console.WriteLine("a[{0},{1}]=", i, j);
}
}
}
public void printmax()
{
Console.WriteLine("Given Matrix : ");
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
Console.Write("{0}\t", a[i, j]);

}
Console.WriteLine();
}
}
public void interchange()
{
Console.WriteLine("Enter the Row Number to Interchange : ");
Console.WriteLine("Enter the Row Number with which " +
"Interchange is to be Accomplished :");
for (int k = 0; k < n; k++)
{
int temp = a[i - 1, k];
a[i - 1, k] = a[j - 1, k];
a[j - 1, k] = temp;
}
}
public static void Main()
{
int x, y;
interchangerow obj;
Console.Write("Enter the Number of Rows");
Console.Write("Enter the Number of Columns");
obj = new interchangerow(x, y);
obj.printmax();
obj.interchange();
obj.printmax();
}
}```
Program Explanation

In this C# program, we are reading the number of rows and columns value using ‘x’ and ‘y’ variables respectively. The readmatrix() is used to enter the coefficient element values of the array using a[i,j] variable. The printmax() method is used to print the elements in matrix form.

The interchange() method is used to interchange the rows of the matrix. We are reading the row number to interchange using ‘i’ variable. And also reading the row number with which interchange is to accomplish using ‘j’ variable.

For loop is used to interchange the columns. Initialize the value of ‘k’ variable as 0. Check the condition that the value of ‘k’ variable is less than the value of ‘n’ variable. If the condition is true, then execute the iteration of the loop. The temporary variable ‘temp’ is used to interchange the 2 rows of the matrix. Using printmax() method print the interchanged values of the matrix.

Runtime Test Cases
```
Enter the Number of Rows : 3
Enter the Number of Columns : 3
Enter the Elements :
a[0,0]=1
a[0,1]=2
a[0,2]=3
a[1,0]=4
a[1,1]=5
a[1,2]=6
a[2,0]=7
a[2,1]=8
a[2,2]=9
Given Matrix is :
1  2  3
4  5  6
7  8  9
Enter the Row Number to Interchange : 2
Enter the Row Number with which Interchange is to be Accomplished : 3
Given Matrix is :
1  2  3
7  8  9
4  5  6```

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