Двумерные массивы С++

 #include  

#include  

using namespace std; 

int main() { 

    cout > m; 

    auto a = new double*[m]; 

    for (size_t i = 0; i < m; ++i) { 

        a[i] = new double[m]; 

    } 

    puts("Input matrix:"); 

    for (size_t i = 0; i < m; ++i) { 

        for (size_t j = 0; j < m; ++j) { 

            cin >> a[i][j]; 

        } 

    } 

    auto p = 1.0; 

    bool flag = true; 

    for (size_t i = 0; i < m; ++i) { 

        auto sum = 0.0; 

        for (size_t j = 0; j < m; ++j) { 

            sum += pow(a[i][j], 2); 

        } 

        if (sum < 0) { 

            puts("Invalid function argument sqrt"); 

            flag = !flag; 

            break; 

        } else if (sum == 0) { 

            p = 0; 

            break; 

        } 

        p *= sqrt(sum); 

    } 

    if (flag) { 

        cout

 #include  

#include  

using namespace std; 

 

double sqsumm(const double* arr, size_t arr_size) 

{ 

	double summ{}; 

	while (arr_size--) summ += *arr**arr++; 

	return sqrt(summ); 

} 

 

int main()  

{ 

	constexpr size_t M = 3; 

	double prod = 1.; 

	double arr[M][M]; 

	for (int i = 0; i < M * M; i++) cin >> arr[0][i]; 

	for (auto i : arr) prod *= sqsumm(i, M); 

	cout