1( статичний массив

#include <iostream>

#include <cstdlib>

#include <ctime>

using namespace std;

int main() {

   int rows, columns, column_number;

   cout << "Enter the number of rows: ";

   cin >> rows;

   cout << "Enter the number of columns: ";

   cin >> columns;

   cout << "Enter the number of the column you want to modify: ";

   cin >> column_number;

   static double matrix[8][8]; // static 2D array with a maximum size of 8x8

   // fill the matrix with random numbers

   srand(time(0));

   for (int i = 0; i < rows; i++)

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

           matrix[i][j] = rand() % 10;

   // print the original matrix

   cout << "Original matrix:" << endl;

   for (int i = 0; i < rows; i++) {

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

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

       cout << endl;

   }

   // create a one-dimensional array with the same size as the column we want to modify

   static double column_values[8];

   for (int i = 0; i < rows; i++) {

       cout << "Enter a value for row " << i + 1 << ": ";

       cin >> column_values[i];

   }

   // modify the column

   for (int i = 0; i < rows; i++)

       matrix[i][column_number - 1] = column_values[i];

   // print the modified matrix

   cout << "Modified matrix:" << endl;

   for (int i = 0; i < rows; i++) {

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

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

       cout << endl;

   }

   return 0;

}

2( динамічний массив

#include <iostream>

#include <cstdlib>

#include <ctime>

using namespace std;

int main() {

   int rows, columns, column_number;

   cout << "Enter the number of rows: ";

   cin >> rows;

   cout << "Enter the number of columns: ";

   cin >> columns;

   cout << "Enter the number of the column you want to modify: ";

   cin >> column_number;

   double** matrix = new double*[rows]; // dynamic 2D array

   for (int i = 0; i < rows; i++)

       matrix[i] = new double[columns];

   // fill the matrix with random numbers

   srand(time(0));

   for (int i = 0; i < rows; i++)

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

           matrix[i][j] = rand() % 10;

   // print the original matrix

   cout << "Original matrix:" << endl;

   for (int i = 0; i < rows; i++) {

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

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

       cout << endl;

   }

   // create a one-dimensional array with the same size as the column we want to modify

   double* column_values = new double[rows];

   for (int i = 0; i < rows; i++) {

       cout << "Enter a value for row " << i + 1 << ": ";

       cin >> column_values[i];

   }

   // modify the column

   for (int i = 0; i < rows; i++)

       matrix[i][column_number - 1] = column_values[i];

   // print the modified matrix

   cout << "Modified matrix:" << endl;

   for (int i = 0; i < rows; i++) {

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

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

       cout << endl;

   }

   // deallocate memory

   for (int i = 0; i < rows; i++)

       delete[] matrix[i];

   delete[] matrix;

   delete[] column_values;

   return 0;

}