ITP exceptions 2 second

#include <iostream>

using namespace std;

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

public:
    Vector() {
        cin >> dimension;
        arr = new int[dimension];
        for (int i = 0; i < dimension; i++)
            cin >> arr[i];
    }

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

        int c = 0, d = 0;
        for (int i = 0; i < a.dimension; i++) {
            d = abs(a.arr[i] - b.arr[i]);
            c += (a.arr[i] - b.arr[i]) * (a.arr[i] - b.arr[i]);
        }
        if (d == 0)
            throw domain_error("domain_error");

        c = sqrt(c);
        if (c >= 100)
            throw length_error("length_error");
        return c;
    }
};

int main()
{
    Vector a, b;

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