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int? x = null;
int y = x ?? -1;
Console.WriteLine("y now equals -1 because x was null => {0}", y);
int i = DefaultValueOperatorTest.GetNullableInt() ?? default(int);
Console.WriteLine("i equals now 0 because GetNullableInt() returned null => {0}", i);
string s = DefaultValueOperatorTest.GetStringValue();
Console.WriteLine("Returns 'Unspecified' because s is null => {0}", s ?? "Unspecified");
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