Could any one explain on a Nullable types example?

Question

Can someone explain this one too?

Getting a default value with Nullable Types:

int? n1=null; int n2=3;

(n1 ?? 10) will return the value 10.

int product= (n1 ?? 10) * n2; Now product will hold 30 since (n1??10) will return 10.

now,what does the statement " (n1 ?? 10) " means and why does it return the value '10'

possible duplicate of [What is the "??" operator for?](http://stackoverflow.com/questions/827454/what-is-the-operator-for) — Dour High Arch, May 04 '11 at 03:56

score 3 · Answer 1 · edited Jun 20 '20 at 09:12

3

From MSDN:

The ?? operator is called the null-coalescing operator and is used to define a default value for a nullable value types as well as reference types. It returns the left-hand operand if it is not null; otherwise it returns the right operand.

I think any extra comment is not required

edited Jun 20 '20 at 09:12

Community

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answered Apr 27 '11 at 14:32

Anton Semenov

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score 1 · Answer 2 · edited Mar 15 '13 at 17:55

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I don't usually program in C#, but ?? is the null-coalescing operator as described in MSDN's "?? Operator (C# Reference)".

n1 ?? 10

Basically says "If n1 is null, then change it to the default value of 10."

edited Mar 15 '13 at 17:55

Jeromy French

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answered Apr 27 '11 at 14:36

Casey Wilkins

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Could any one explain on a Nullable types example?

2 Answers2