JuniorTheoryCommon

What does the program print?

Box box = new Box();
Change(box);
Console.WriteLine(box.Value);

void Change(Box b)
{
    b.Value = 2;
    b = new Box();
    b.Value = 3;
}

class Box { public int Value; }

Expecting 3: objects are passed by value too, and the value is a reference; b = new Box() changes only the method's copy, so box keeps its object with 2.
Expecting 0: the method gets a copy of the reference, not of the object, so b.Value = 2 changes the very object box leads to.

What would the program print if the parameter were declared as ref Box b and called with Change(ref box)?
What would it print if Box were a struct instead of a class?

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JuniorTheoryCommon

What does the program print?

Box box = new Box();
Change(box);
Console.WriteLine(box.Value);

void Change(Box b)
{
    b.Value = 2;
    b = new Box();
    b.Value = 3;
}

class Box { public int Value; }

Expecting 3: objects are passed by value too, and the value is a reference; b = new Box() changes only the method's copy, so box keeps its object with 2.
Expecting 0: the method gets a copy of the reference, not of the object, so b.Value = 2 changes the very object box leads to.

What would the program print if the parameter were declared as ref Box b and called with Change(ref box)?
What would it print if Box were a struct instead of a class?

Back to questions Open topic in roadmap →Answer it yourself — Quiz