#include <iostream>
#include <string.h>

const int SIZE_FIRST_ARR = 4;
const int SIZE_SECOND_ARR = 2;
using namespace std;

int* addOneArrayToAnother (int arr1[], int arr2[], int size1,int size2)
{
	int* newArr;

	if(SIZE_FIRST_ARR > SIZE_SECOND_ARR)
	{
		newArr = new int[1 + SIZE_FIRST_ARR];

		int carry = 0;
		for(int i = SIZE_FIRST_ARR - 1 , j = SIZE_SECOND_ARR - 1 , k =  SIZE_FIRST_ARR  ;  j >= 0 || i >= 0 || k >= 0  ;i--, j-- ,k--)
		{

			//if((arr1[i] + arr2[j]) >= 10)
			//{
				newArr[k] = (arr1[i] + arr2[j] + carry) % 10;
				carry = (arr1[i] + arr2[j]) / 10;

				if( arr1[i] >= 10)
				{
					newArr[k] = (arr1[i] + arr2[i] + carry) % 10;
					carry = (arr1[i] + arr2[i]) / 10;
				}


				//arr1[i - 1] += carry;
				//if(arr1[i - 1] >= 10)
				//{
				//	k--;
				//	newArr[k] = (arr1[i - 1] + arr2[j - 1]) % 10;
				//	carry = (arr1[i - 1] + arr2[j - 1]) / 10;
				//	arr1[i - 1] = arr1[i - 1] + carry;
				//}
				//k--;
			//}
			//else if((arr1[i] + arr2[j]) < 10)
			//{
				//newArr[k] = (arr1[i] + arr2[i]);
			//}
		//	k--;
		}
	}
	else if(SIZE_FIRST_ARR < SIZE_SECOND_ARR)
	{
		newArr = new int[1 + SIZE_SECOND_ARR];
		size2 = 1 + SIZE_SECOND_ARR;
	}

	return newArr;

}

void main()
{
	int arr1[SIZE_FIRST_ARR] = {9,9,9,9};
	int arr2[SIZE_SECOND_ARR] = {9,7};
	int* newArr;
	int size1 = SIZE_FIRST_ARR;
	int size2 = SIZE_SECOND_ARR;
	int newSize;

	newArr = addOneArrayToAnother( arr1, arr2, size1,size2);

	for(int i = 0; i < SIZE_FIRST_ARR + 1;i++)
	{
		cout << newArr[i] <<" ";
	}

	cout << '\n';
	system("pause");
}