C++ Program to Swap Rows of a Matrix

This C++ program interchanges the rows of a matrix. The program takes the the matrix from the input and interchanges the row numbers given from input. The changed matrix is finally printed.

Here is the source code of the C++ program which interchanges the rows of a matrix. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to interchange the rows of a matrix

```
 */
```
```
#include <iostream>
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```
using namespace std;
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```
 
```
```
int main() {
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    int xsize, ysize, * swap;
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    int row1, row2;
```
```
 
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    cout << "Enter the size of matrix : ";

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    cin >> ysize >> xsize;
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    int ** matrix = new int*[ysize];
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    // initialising columns for each row

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    for(int i = 0; i < ysize; i++) {
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        matrix[i] = new int[xsize];
```
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    }
```

    // taking value corresponding to each cell from input

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    cout << "Enter the matrix\n";
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    for(int i = 0; i < ysize; i++) {
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        for(int j = 0; j < xsize; j++) {

```
            cin >> matrix[i][j];
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        }
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    }
```

    cout << "Enter the rows to be interchanged : ";

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    cin >> row1 >> row2;
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    // interchanging the rows
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    swap = matrix[row1 - 1];
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    matrix[row1 - 1] = matrix[row2 - 1];

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    matrix[row2 - 1] = swap;
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    // printing the values
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    cout << "New Matrix\n";
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    for(int i = 0; i < ysize; i++) {
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        for(int j = 0; j < xsize; j++) {

            cout << matrix[i][j] << " ";

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        }
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        cout << "\n";
```
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    }
```
```
}
```

$ gcc test.cpp
$ a.out
Enter the size of matrix : 3 3
Enter the matrix
1 2 3
4 5 6
7 8 9
Enter the rows to be interchanged : 1 2
New Matrix
4 5 6 
1 2 3 
7 8 9

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