Лабораторная №9 (12.68б)

#include <iostream>
using namespace std;

int main()
{
    int const m = 5;
    int const n = 5;
    int a[m][n];

    int c = 0;
    int i, j;
    int sum = 0;

    srand(time(0));

    for (i = 0; i < m; i++) {  //создаём матрицу
        for (j = 0; j < n; j++) {
            a[i][j] = 20 + rand() % 100;
            cout << a[i][j] << "\t";
        }
        cout << endl;
    }

    for (j = 0; j < n; j++) {  //прогоняемся по 4ой строке
        if (a[3][j] % 3 == 0) {
            sum = sum + a[3][j];
            c++;
        }

    }
    cout << "\n";
    cout << "Arithmetic mean of the elements of the 4th row that are multiples of 3: " << sum / c << endl;
}