What is nullable type

Question

which of the following are tuue about Nullable type?
A- a Nullable type is refrence type a refrence type.
B- an implicit conversion exists from any non-nullable value type to a nullable type t? exists if there is a predefined conversion from
C-a predefined conversion from the nullable type s? to the nullable type t? exist if there is a predefined conversion from the non-nullable type s to the non nu

Vulpes · Answer

Although I agree with Manikavelu that A is false and B is true I also think that C (if I've understood it correctly) is true as well. For example consider this code: int? i = 3; long? l = i; Console.WriteLine(l); // 3 This compiles and runs fine because there's an implicit conversion between int and long and hence between int? and long?. Consider now this code: int? j = 4; short? s = j; Console.WriteLine(s); This fails to compile because there's no implicit conversion between int and short and hence between int? and short?.

Manikavelu Velayutham · Answer

Answer is B an implicit conversion exists from any non-nullable value type to a nullable type t? exists if there is a predefined conversion from It cant be A or C. Since the reference type already supports nullable.