exercise 1

console.log("Case 1");
function a() {
    var x=1;
    function b() {
        console.log("internal function", x);
    }
++x;
b();
}
a();


console.log("Case 2");
function a() {
    var x=1;
    function b() {
        console.log("internal function", x++);
    }
++x;
return b;
}
a()();

console.log("Case 3");
function a() {
    var x=1;
    function b() {
        console.log("internal function", x++);
    }
++x;
return b;
}
y=a();
y();
y();
y();