JuniorTheoryCommon

What does the program print?

var a = new House("red");
House b = a;
var c = new House("red");
b.Color = "blue";
Console.WriteLine(a.Color + " " + c.Color);

class House
{
    public string Color { get; set; }

    public House(string color) => Color = color;
}

blue red

Expecting red red: House b = a; copies the reference, not the house, so a change through b is seen through a.
Expecting two red houses to be one house: each new builds a separate object, so repainting the house of a leaves c red.

What would the program print if b got its own house with new?
What does a == b give after House b = a;, and why?

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JuniorTheoryCommon

What does the program print?

var a = new House("red");
House b = a;
var c = new House("red");
b.Color = "blue";
Console.WriteLine(a.Color + " " + c.Color);

class House
{
    public string Color { get; set; }

    public House(string color) => Color = color;
}

blue red

Expecting red red: House b = a; copies the reference, not the house, so a change through b is seen through a.
Expecting two red houses to be one house: each new builds a separate object, so repainting the house of a leaves c red.

What would the program print if b got its own house with new?
What does a == b give after House b = a;, and why?

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