BitArray.Set(Int32, Boolean) Method
Definition
Important
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Sets the bit at a specific position in the BitArray to the specified value.
public:
void Set(int index, bool value);
public void Set (int index, bool value);
member this.Set : int * bool -> unit
Public Sub Set (index As Integer, value As Boolean)
Parameters
- index
- Int32
The zero-based index of the bit to set.
- value
- Boolean
The Boolean value to assign to the bit.
Exceptions
index
is less than zero.
-or-
index
is greater than or equal to the number of elements in the BitArray.
Examples
The following code example shows how to set and get specific elements in a BitArray.
using namespace System;
using namespace System::Collections;
void PrintIndexAndValues( IEnumerable^ myCol );
int main()
{
// Creates and initializes a BitArray.
BitArray^ myBA = gcnew BitArray( 5 );
// Displays the properties and values of the BitArray.
Console::WriteLine( "myBA values:" );
PrintIndexAndValues( myBA );
// Sets all the elements to true.
myBA->SetAll( true );
// Displays the properties and values of the BitArray.
Console::WriteLine( "After setting all elements to true," );
PrintIndexAndValues( myBA );
// Sets the last index to false.
myBA->Set( myBA->Count - 1, false );
// Displays the properties and values of the BitArray.
Console::WriteLine( "After setting the last element to false," );
PrintIndexAndValues( myBA );
// Gets the value of the last two elements.
Console::WriteLine( "The last two elements are: " );
Console::WriteLine( " at index {0} : {1}", myBA->Count - 2, myBA->Get( myBA->Count - 2 ) );
Console::WriteLine( " at index {0} : {1}", myBA->Count - 1, myBA->Get( myBA->Count - 1 ) );
}
void PrintIndexAndValues( IEnumerable^ myCol )
{
int i = 0;
IEnumerator^ myEnum = myCol->GetEnumerator();
while ( myEnum->MoveNext() )
{
Object^ obj = safe_cast<Object^>(myEnum->Current);
Console::WriteLine( " [{0}]: {1}", i++, obj );
}
Console::WriteLine();
}
/*
This code produces the following output.
myBA values:
[0]: False
[1]: False
[2]: False
[3]: False
[4]: False
After setting all elements to true,
[0]: True
[1]: True
[2]: True
[3]: True
[4]: True
After setting the last element to false,
[0]: True
[1]: True
[2]: True
[3]: True
[4]: False
The last two elements are:
at index 3 : True
at index 4 : False
*/
using System;
using System.Collections;
public class SamplesBitArray {
public static void Main() {
// Creates and initializes a BitArray.
BitArray myBA = new BitArray( 5 );
// Displays the properties and values of the BitArray.
Console.WriteLine( "myBA values:" );
PrintIndexAndValues( myBA );
// Sets all the elements to true.
myBA.SetAll( true );
// Displays the properties and values of the BitArray.
Console.WriteLine( "After setting all elements to true," );
PrintIndexAndValues( myBA );
// Sets the last index to false.
myBA.Set( myBA.Count - 1, false );
// Displays the properties and values of the BitArray.
Console.WriteLine( "After setting the last element to false," );
PrintIndexAndValues( myBA );
// Gets the value of the last two elements.
Console.WriteLine( "The last two elements are: " );
Console.WriteLine( " at index {0} : {1}", myBA.Count - 2, myBA.Get( myBA.Count - 2 ) );
Console.WriteLine( " at index {0} : {1}", myBA.Count - 1, myBA.Get( myBA.Count - 1 ) );
}
public static void PrintIndexAndValues( IEnumerable myCol ) {
int i = 0;
foreach ( Object obj in myCol ) {
Console.WriteLine( " [{0}]: {1}", i++, obj );
}
Console.WriteLine();
}
}
/*
This code produces the following output.
myBA values:
[0]: False
[1]: False
[2]: False
[3]: False
[4]: False
After setting all elements to true,
[0]: True
[1]: True
[2]: True
[3]: True
[4]: True
After setting the last element to false,
[0]: True
[1]: True
[2]: True
[3]: True
[4]: False
The last two elements are:
at index 3 : True
at index 4 : False
*/
Imports System.Collections
Public Class SamplesBitArray
Public Shared Sub Main()
' Creates and initializes a BitArray.
Dim myBA As New BitArray(5)
' Displays the properties and values of the BitArray.
Console.WriteLine("myBA values:")
PrintIndexAndValues(myBA)
' Sets all the elements to true.
myBA.SetAll(True)
' Displays the properties and values of the BitArray.
Console.WriteLine("After setting all elements to true,")
PrintIndexAndValues(myBA)
' Sets the last index to false.
myBA.Set(myBA.Count - 1, False)
' Displays the properties and values of the BitArray.
Console.WriteLine("After setting the last element to false,")
PrintIndexAndValues(myBA)
' Gets the value of the last two elements.
Console.WriteLine("The last two elements are: ")
Console.WriteLine(" at index {0} : {1}", _
myBA.Count - 2, myBA.Get(myBA.Count - 2))
Console.WriteLine(" at index {0} : {1}", _
myBA.Count - 1, myBA.Get(myBA.Count - 1))
End Sub
Public Shared Sub PrintIndexAndValues(myCol As IEnumerable)
Dim i As Integer
Dim obj As Object
i = 0
For Each obj In myCol
Console.WriteLine(" [{0}]: {1}", i, obj)
i = i + 1
Next obj
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
' myBA values:
' [0]: False
' [1]: False
' [2]: False
' [3]: False
' [4]: False
'
' After setting all elements to true,
' [0]: True
' [1]: True
' [2]: True
' [3]: True
' [4]: True
'
' After setting the last element to false,
' [0]: True
' [1]: True
' [2]: True
' [3]: True
' [4]: False
'
' The last two elements are:
' at index 3 : True
' at index 4 : False
Remarks
This method is an O(1)
operation.