Polje kao parametar [Funkcije 1.zadatak]

#include <iostream>


typedef unsigned int uint;

using namespace std;

bool IsNotAnInteger(int n)
{
    if (cin.fail())
    {
        cin.clear();
        cin.ignore(256, '\n');
        return true;
    }
    if (n < 1) return true;

    return false;
}

uint argv(uint arr[], uint n)
{
    uint sum = 0;

    if (n == 1) return arr[--n]+=2;

    for (uint i = 0; i < n; i++)
        sum += arr[i];

    return sum;
}

int main()
{
    uint n;

    do
    {
        cout << "Unesite koliko brojeva: ";
        cin >> n;
    }
    while (IsNotAnInteger(n));

    uint* arr = new uint[n];


    for (uint i = 0; i < n; i++)
    {
        if (n==1)
        {
            cout << "Unesi broj: ";
            cin >> arr[i];
        }

        else
        {
            cout << "Unesi " << i + 1 << ". broj: ";
            cin >> arr[i];
        }
    }


    cout << argv(arr, n) << endl;


    system("pause");
    return 0;
}