C#

prasadbuddhika wrote:

as i read if you compare two nullable types that both are having null it should be true

prasadbuddhika wrote:

ut i get the false (as in the code "x is less than y " )

if (x > y) // In your example you used operator >= as in "x is greater or equal than y"
{
      Console.WriteLine("x is greater than y ");
}
else if (x < y)
{
      Console.WriteLine("x is less than y ");
}

static void Main(string[] args) {
  int? x = null; 
  int? y = null;
  Compare(x, y);
  x = 1;
  Compare(x, y);
  Console.ReadLine();
}

private static void Compare(int? x, int? y) {
  Console.WriteLine("{0} >= {1} {2}", x == null ? "null" : x.ToString(), y == null ? "null" : y.ToString(), x >= y);
  Console.WriteLine("{0} > {1} {2}", x == null ? "null" : x.ToString(), y == null ? "null" : y.ToString(), x > y);
  Console.WriteLine("{0} == {1} {2}", x == null ? "null" : x.ToString(), y == null ? "null" : y.ToString(), x == y);
  Console.WriteLine("{0} < {1} {2}", x == null ? "null" : x.ToString(), y == null ? "null" : y.ToString(), x < y);
  Console.WriteLine("{0} <= {1} {2}", x == null ? "null" : x.ToString(), y == null ? "null" : y.ToString(), x <= y);
  Console.WriteLine();
}

/*
null >= null False
null > null False
null == null True
null < null False
null <= null False

1 >= null False
1 > null False
1 == null False
1 < null False
1 <= null False
 */

Class Sample
  Public Shared Sub Main() 
    Dim x as Nullable(Of Int32): Dim y as Nullable(Of Int32) 
    x = Nothing: y = Nothing
    Compare(x, y)
    x = 1
    Compare(x, y)
    x = Nothing: y = 1
    Compare(x, y)
    Console.ReadLine()
  End Sub
  
  Public Shared Sub Compare(x as Nullable(Of Int32), y as Nullable(Of Int32))
    Dim xvalue as String: Dim yvalue as String
    If x.HasValue Then
      xvalue = x.ToString()
    Else
      xvalue = "Nothing"
    End If
    If y.HasValue Then
      yvalue = y.ToString()
    Else
      yvalue = "Nothing"
    End If
    Console.WriteLine("Nullable.Equals({0}, {1}) {2}", xvalue, yvalue, Nullable.Equals(x, y))
    Console.WriteLine("Nullable.Compare({0}, {1}) {2}", xvalue, yvalue, Nullable.Compare(x, y))
    Console.WriteLine()
  End Sub
End Class

Nullable.Equals(Nothing, Nothing) True
Nullable.Compare(Nothing, Nothing) 0

Nullable.Equals(1, Nothing) False
Nullable.Compare(1, Nothing) 1

Nullable.Equals(Nothing, 1) False
Nullable.Compare(Nothing, 1) -1

Alan N wrote:

I knew I'd never get that past you

Member 3391788 wrote:

i want to send file as msn messenger

Member 3391788 wrote:

how to transfer data between c# ListBox controls

sudhir behera wrote:

its urgent plz help me.

sudhir behera wrote:

i want my windows form to be printed in actual printing document.