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c#null-coalescing-operator

Null-coalescing operator

I have the following code:

decimal? a = 2m;
decimal? b = 2m;
decimal c = a ?? 1m * b ?? 1m;

Since both a and b have been filled in, I'm expecting c to give me the result of 4.

However, the result I get is 2, in which case b is taken as 1 instead of 2.

Does anyone know what is the reason behind this behaviour?

Solution

  • The expression works as:

    decimal c = a ?? (1m * b) ?? 1m;

    As a has a value, you get that.