ITP exceptions 2 my

#include <iostream>
#include <math.h>

using namespace std;

class Vector {
private:
    int dimension;
    int* array;

public:
    Vector() {
        dimension = 0;
        array = NULL;
    }

    friend istream& operator >> (istream& cin, Vector& now) {
        cin >> now.dimension;
        now.array = new int[now.dimension];
        for (int i = 0; i < now.dimension; i++)
            cin >> now.array[i];
        return cin;
    }

    friend ostream& operator << (ostream& cout, Vector now) {
        for (int i = 0; i < now.dimension; i++)
            cout << now.array[i];
        return cout;
    }

    friend int get_distance(Vector, Vector);
};

int get_distance(Vector first, Vector second) {
    int result = 0;
    if (first.dimension != second.dimension)
        throw invalid_argument("invalid_argument exception");

    bool check = true;
    for (int i = 0; i < first.dimension; i++) {
        check = check && first.array[i] == second.array[i];
        result += pow(first.array[i] - second.array[i], 2);
    }

    result = sqrt(result);

    if (check)
        throw domain_error("domain_error exception");

    if (result >= 100)
        throw length_error("length_error exception");


    return result;
}

int main() {
    Vector first, second;

    cin >> first >> second;

    try {
        cout << get_distance(first, second);
    }
    catch (invalid_argument & exception) {
        cout << exception.what();
    }
    catch (length_error & exception) {
        cout << exception.what();
    }
    catch (domain_error & exception) {
        cout << exception.what();
    }
}