JuniorTheoryCommon

What does the program print (lines separated by spaces)?

int bonus = 10;
Func<int, int> add = x => x + bonus;
Console.WriteLine(add(1));
bonus = 20;
Console.WriteLine(add(1));

11 21

Expecting 11 11: a lambda does not copy bonus when it is created; it holds the variable and reads its current value at each call.
Expecting a closure to see only the variable's final value: each call reads the value it has at the moment of that call.

What changes in the output if the lambda itself runs bonus++ before returning?
Why do lambdas created in a for loop that capture i all return the same number?

JuniorTheoryCommon

int bonus = 10;
Func<int, int> add = x => x + bonus;
Console.WriteLine(add(1));
bonus = 20;
Console.WriteLine(add(1));

11 21

Expecting 11 11: a lambda does not copy bonus when it is created; it holds the variable and reads its current value at each call.
Expecting a closure to see only the variable's final value: each call reads the value it has at the moment of that call.

What changes in the output if the lambda itself runs bonus++ before returning?
Why do lambdas created in a for loop that capture i all return the same number?