#include <algorithm> //Only needed for Option 1
#include <iostream>
using namespace std;
int main() {
//Option 1
const int len{3};
int arr1[len] = {1,2,3};
int arr2[len]; //Will be the copy of arr1
copy(begin(arr1), end(arr1), begin(arr2));
//Use the following, if you are not using namespace std;
//std::copy(std::begin(arr), std::end(arr), std::begin(copy));
//Option 2
int arr3[len]; //Will be the copy of arr1
for(int i = 0; i<len; ++i) {
arr3[i] = arr1[3];
}
return 0; //exitcode
};