guess the value of each of the following and explain your logic. (please don't run it, have fun guessing)

    int x=5;
    cout<< x++ + ++x<<endl;
    x=5;
    cout<< ++x + x++<<endl;
    x=5;
    cout<<++x + ++x<<endl;
    x=5;
    cout<<++x + ++x + ++x<<endl;