JuniorTheoryCommon

What does the program print?

Point a = new Point();
a.X = 1;
Point b = a;
b.X = 2;
Move(a);
Console.WriteLine(a.X + " " + b.X);

void Move(Point p) { p.X = 10; }

struct Point { public int X; }

1 2

Expecting 10 10: Point is a struct, so Point b = a copies the fields, and Move changes its own copy of the point, not a.
Expecting 10 2: a method gets a copy of a struct argument; to change the caller's point it needs ref Point p and the call Move(ref a).

What would the program print if Point were declared as a class?
How would you change Move so that it moves the caller's point?

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JuniorTheoryCommon

What does the program print?

Point a = new Point();
a.X = 1;
Point b = a;
b.X = 2;
Move(a);
Console.WriteLine(a.X + " " + b.X);

void Move(Point p) { p.X = 10; }

struct Point { public int X; }

1 2

Expecting 10 10: Point is a struct, so Point b = a copies the fields, and Move changes its own copy of the point, not a.
Expecting 10 2: a method gets a copy of a struct argument; to change the caller's point it needs ref Point p and the call Move(ref a).

What would the program print if Point were declared as a class?
How would you change Move so that it moves the caller's point?

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