C6385 & C6201 Warning in C++ array

i get a warning messages while doing merge between two sorted arrays into one sorted array as follows: and the error or warning messages that come to me are: C6385 & C6201

#include <iostream>
using namespace std;

int main()
{
    int arr1[5] = { 1,3,5,7,9 }, arr2[5] = { 0,2,4,6,8 }, arr3[10];

    for (int i = 1; i <= 9; i++)
        if (arr1[i] < arr2[i])
            arr3[i] = arr1[i];
        else
            arr3[i] = arr2[i];
        cout << arr3[10] << endl;

    return 0;
}