ITP exceptions 2 first

#include <iostream>

using namespace std;

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

public:
    Vector(int dimension) {
        this->dimension = dimension;
        arr = new int[dimension];
    }

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

    bool isEquale(Vector b) {
        for (int i = 0; i < dimension; i++) {
            if (arr[i] != b.arr[i])
                return false;
        }

        return true;
    }

    friend int get_distance(Vector& a, Vector& b) {
        if (a.dimension != b.dimension)
            throw invalid_argument("invalid_argument exception");

        if (a.isEquale(b))
            throw domain_error("domain_error exception");

        int c = 0;
        for (int i = 0; i < a.dimension; i++)
            c += (a.arr[i] - b.arr[i]) * (a.arr[i] - b.arr[i]);
        c = sqrt(c);

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

        return c;
    }
};

int main()
{
    int dimension;
    cin >> dimension;
    Vector a(dimension);
    cin >> a;

    cin >> dimension;
    Vector b(dimension);
    cin >> b;

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