string_and_int_Stringstreams

#include <iostream>
#include <sstream>
#include<cstdlib>
#include <cctype>
#include<cctype>

using namespace std;
const int maxSize = 1000;

int findLength(string &str);
void initializeArray(int arr[], int sizeArr, string &str);
bool AreOnlyNumbers(string strNum);

int main()
{
    cout << "enter the firs arr: ";
    string str;
    getline(cin, str);
    int arr1[maxSize] = {};
    int maxFilledIndex1 = findLength(str);
    initializeArray(arr1, maxFilledIndex1, str);

    cout << "enter the second arr: ";
    getline(cin, str);
    int arr2[maxSize] = {};
    int maxFilledIndex2 = findLength(str);
    initializeArray(arr2, maxFilledIndex2, str);

    cout << "arr1 elements: ";
    for (int i = 0; i < maxFilledIndex1; i++)
    {
        cout << arr1[i] << " ";
    }
    cout << endl;


    cout << "arr2 elements: ";
    for (int i = 0; i < maxFilledIndex2; i++)
    {
        cout << arr2[i] << " ";
    }
    cout << endl;
}

int findLength(string &str)
{
    int n = 0;

    for (char e : str)
        if (e == ' ')
            n++;

    return ++n;
}

void initializeArray(int arr[], int sizeArr, string &str)
{
    bool sInput = false;
    int index = 0;

    while (!sInput)
    {
        istringstream inputStream(str);

        ostringstream outputStream;

        sInput = true;

        while (inputStream)
        {
            string strNum;
            inputStream >> strNum;

            if (AreOnlyNumbers(strNum))
            {
                int num = atoi(strNum.c_str());
                arr[index] = num;
                index++;
            }
            else
            {
                //inputStream.clear();
                //string unparsed;
                //inputStream >> unparsed;

                if (!strNum.empty())
                {
                    outputStream << strNum << " ";
                    sInput = false;
                }
            }
        }

        if (!sInput)
        {
            cout << "unparsed numbers: " << outputStream.str() << "enter again: ";

            getline(cin, str);
        }
    }
}

bool AreOnlyNumbers(string strNum)
{
    if (strNum.empty())
    {
        return false;
    }
    for (int i = 0; i < strNum.size(); i++)
    {
        if (isalpha(strNum[i]))
        {
            return false;
        }
    }
    return true;
}