private static int y = 5; // have to define 'static', otherwise y couldn't be accessed by the static method 'Main'
#endregion Fields
#region Methods
public static void Main(string[] args)
{
// Case 1:
int x = 6; // can not declare public/private/static on this, why?
int z = 900;
changeValue (x); // x is a internal variable to the Main method.
changeValueRef (ref z); // ref will force z be treated as reference type. The "ref" key word need exist in function and when called
changeValue (y); // y is another static member on the Main class.
Console.WriteLine ("primiate value make a copy, x: {0}", x); // x is still 6. because they are primative
Console.WriteLine ("primiate value make a copy, y: {0}", y); // y is still 5
Console.WriteLine ("primiate value make a copy, z: {0}", z); // z will be changed to 10
// Case 2:
changeGlobalValue ();
Console.WriteLine ("use public static class to mimic global variables, x: {0}", Globals.x);
// Case 3:
Globals2 g2 = new Globals2 ();
changeGlobalValue2 (g2);
Console.WriteLine ("Pass non-static class as variable, but need instantiate, g2.x: {0}", g2.x);
}
// Case 3:
// a non-static class can be passed in as parameter. but need to be instantiat when called
private static int changeGlobalValue2(Globals2 g)
{
g.x = 56;
return g.x;
}