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// Define some local nullable types.

int? nullableInt = 10;

double? nullableDouble = 3.14;

bool? nullableBool = null;

char? nullableChar = 'a';

int?[] arrayOfNullableInts = new int?[10];

// Error! Strings are reference types!

// string? s = "oops";

}

In C#, the ? suffix notation is a shorthand for creating an instance of the generic System.

Nullable structure type. Although we will not examine generics until Chapter 10, it is important

to understand that the System.Nullable type provides a set of members that all nullable types

can make use of.

For example, you are able to programmatically discover whether the nullable variable indeed

has been assigned a null value using the HasValue property or the != operator. The assigned value of

a nullable type may be obtained directly or via the Value property. Given that the ? suffix is just a

shorthand for using Nullable, you could implement your LocalNullableVariables() method as

follows:

static void LocalNullableVariables()

{