C# Nullables provides special data types, the nullable types, to which you can assign a normal range of values as well as null values.
For example, you can store any value from -2,147,483,648 to 2,147,483,647 or null in a Nullable<Int32> variable. Similarly, you can assign true, false, or null in a Nullable<bool> variable. Syntax for declaring a nullable type is as follows −
< data_type> ? <variable_name> = null;
The following example demonstrates the use of nullable data types −
using System;
namespace CalculatorApplication {
class NullablesAtShow {
static void Main(string[] args) {
int? num1 = null;
int? num2 = 45;
double? num3 = new double?();
double? num4 = 3.14157;
bool? boolval = new bool?();
// display the values
Console.WriteLine("Nullables at Show: {0}, {1}, {2}, {3}", num1, num2, num3, num4);
Console.WriteLine("A Nullable boolean value: {0}", boolval);
Console.ReadLine();
}
}
}
The following result −
Nullables at Show: , 45, , 3.14157 A Nullable boolean value:
C# Nullables Coalescing Operator (??)
If the value of the first operand is null, then the operator returns the value of the second operand, otherwise, it returns the value of the first operand. The following example explains this −
using System;
namespace CalculatorApplication {
class NullablesAtShow {
static void Main(string[] args) {
double? num1 = null;
double? num2 = 3.14157;
double num3;
num3 = num1 ?? 5.34;
Console.WriteLine(" Value of num3: {0}", num3);
num3 = num2 ?? 5.34;
Console.WriteLine(" Value of num3: {0}", num3);
Console.ReadLine();
}
}
}
The following result −
Value of num3: 5.34 Value of num3: 3.14157
Next Topic – Click Here
Pingback: C# - Passing Parameters by Output - Adglob Infosystem Pvt Ltd
Really informative blog.Really looking forward to read more. Fantastic.