What is nullable type

surbhi jain

16y2.6k.NET

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

2 Replies

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Vulpes14y ago
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 Velayutham16y ago
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.