What is the output of the following code? int? a = 3; int? b = 4; int? c = null; System.Console.WriteLine(a + c ?? b);

282.

What is the output of the following code?

int? a = 3;
int? b = 4;
int? c = null;
System.Console.WriteLine(a + c ?? b);

null

Does not compile

Since c is null, a c is null, therefore the value of b is returned.
The "??" operator is interpreted as if a c is not null, return a c, else return b