What will be the output of the following C++ code?

#include <iostream>
#include <functional>
#include <numeric>
using namespace std;
int myop (int x, int y)
{
    return x + y;
}
int main ()
{
    int val[] = {1, 2, 3, 5};
    int result[7];
    adjacent_difference (val, val + 7, result);
    for (int i = 0; i < 4; i++)
        cout << result[i] <<' ';
    return 0;
}