for auto

#include <iostream>
using namespace std;

int main()
{

    int x[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

    for( auto y : x ) {
        cout << y << " ";
    }
    cout << endl;

    for( auto &y : x ) {
        y = 1;
        cout << y << " ";
    }
    cout << endl;

    for( auto y : x ) {
        cout << y << " ";
    }
    cout << endl;

}

/*
output:

1 2 3 4 5 6 7 8 9 10
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1

*/