Export (0) Print
Expand All

Int32 Structure

Updated: June 2010

Represents a 32-bit signed integer.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Structure Int32 _
	Implements IComparable, IFormattable, IConvertible, IComparable(Of Integer),  _
	IEquatable(Of Integer)
'Usage
Dim instance As Int32

Int32 is an immutable value type that represents signed integers with values ranging from negative 2,147,483,648 (which is represented by the Int32.MinValue constant) through positive 2,147,483,647 (which is represented by the Int32.MaxValue constant). The .NET Framework also includes an unsigned 32-bit integer value type, UInt32, which represents values that range from 0 to 4,294,967,295.

Instantiating an Int32 Value

You can instantiate an Int32 value in several ways:

  • You can declare an Int32 variable and assign it a literal integer value that is within the range of the Int32 data type. The following example declares two Int32 variables and assigns them values in this way.

    Dim number1 As Integer = 64301
    Dim number2 As Integer = 25548612
    
  • You can assign the value of an integer type whose range is a subset of the Int32 type. This is a widening conversion that does not require a cast operator in C# or a conversion method in Visual Basic.

    Dim value1 As SByte = 124
    Dim value2 As Int16 = 1618
    
    Dim number1 As Integer = value1
    Dim number2 As Integer = value2
    
  • You can assign the value of a numeric type whose range exceeds that of the Int32 type. This is a narrowing conversion, so it requires a cast operator in C# and a conversion method in Visual Basic if Option Strict is on. If the numeric value is a Single, Double, or Decimal value that includes a fractional component, the handling of its fractional part depends on the compiler performing the conversion. The following example performs narrowing conversions to assign several numeric values to Int32 variables.

    Dim lNumber As Long = 163245617
    Try 
       Dim number1 As Integer = CInt(lNumber)
       Console.WriteLine(number1)
    Catch e As OverflowException
       Console.WriteLine("{0} is out of range of an Int32.", lNumber)
    End Try 
    
    Dim dbl2 As Double = 35901.997
    Try 
       Dim number2 As Integer = CInt(dbl2)
       Console.WriteLine(number2)
    Catch e As OverflowException
       Console.WriteLine("{0} is out of range of an Int32.", dbl2)
    End Try 
    ' The example displays the following output: 
    '       163245617 
    '       35902
    
  • You can call a method of the Convert class to convert any supported type to an Int32 value. This is possible because Int32 supports the IConvertible interface. The following example illustrates the conversion of an array of Decimal values to Int32 values.

    Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
                                199.55d, 9214.16d, Decimal.MaxValue }
    Dim result As Integer 
    
    For Each value As Decimal In values
       Try
          result = Convert.ToInt32(value)
          Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                            value.GetType().Name, value, _
                            result.GetType().Name, result)
       Catch e As OverflowException
          Console.WriteLine("{0} is outside the range of the Int32 type.", _
                            value)
       End Try    
    Next                                   
    ' The example displays the following output: 
    '    -79228162514264337593543950335 is outside the range of the Int32 type. 
    '    Converted the Decimal value '-1034.23' to the Int32 value -1034. 
    '    Converted the Decimal value '-12' to the Int32 value -12. 
    '    Converted the Decimal value '0' to the Int32 value 0. 
    '    Converted the Decimal value '147' to the Int32 value 147. 
    '    Converted the Decimal value '199.55' to the Int32 value 200. 
    '    Converted the Decimal value '9214.16' to the Int32 value 9214. 
    '    79228162514264337593543950335 is outside the range of the Int32 type.
    
  • You can call the Parse or TryParse method to convert the string representation of an Int32 value to an Int32. The string can contain either decimal or hexadecimal digits. The following example illustrates the parse operation by using both a decimal and a hexadecimal string.

    Dim string1 As String = "244681" 
    Try 
       Dim number1 As Integer = Int32.Parse(string1)
       Console.WriteLine(number1)
    Catch e As OverflowException
       Console.WriteLine("'{0}' is out of range of a 32-bit integer.", string1)
    Catch e As FormatException
       Console.WriteLine("The format of '{0}' is invalid.", string1)
    End Try 
    
    Dim string2 As String = "F9A3C" 
    Try 
       Dim number2 As Integer = Int32.Parse(string2, _
                                System.Globalization.NumberStyles.HexNumber)
       Console.WriteLine(number2)
    Catch e As OverflowException
       Console.WriteLine("'{0}' is out of range of a 32-bit integer.", string2)
    Catch e As FormatException
       Console.WriteLine("The format of '{0}' is invalid.", string2)
    End Try 
    ' The example displays the following output: 
    '       244681 
    '       1022524
    

Performing Operations on Int32 Values

The Int32 type supports standard mathematical operations such as addition, subtraction, division, multiplication, subtraction, negation, and unary negation. Like the other integral types, the Int32 type also supports the bitwise AND, OR, XOR, left shift, and right shift operators.

You can use the standard numeric operators to compare two Int32 values, or you can call the CompareTo or Equals method.

Representing an Int32 as a String

The Int32 type provides full support for standard and custom numeric format strings. (For more information, see Formatting Overview, Standard Numeric Format Strings, and Custom Numeric Format Strings.)

To format an Int32 value as an integral string with no leading zeros, you can call the parameterless ToString method. By using the "D" format specifier, you can also include a specified number of leading zeros in the string representation. By using the "N" format specifier, you can include group separators and specify the number of decimal digits to appear in the string representation of the number. By using the "X" format specifier, you can represent an Int32 value as a hexadecimal string. The following example formats the elements in an array of Int32 values in these four ways.

Dim numbers() As Integer = { -1403, 0, 169, 1483104 }
For Each number As Integer In numbers
   ' Display value using default formatting.
   Console.Write("{0,-8}  -->   ", number.ToString())
   ' Display value with 3 digits and leading zeros.
   Console.Write("{0,11:D3}", number) 
   ' Display value with 1 decimal digit.
   Console.Write("{0,13:N1}", number) 
   ' Display value as hexadecimal.
   Console.Write("{0,12:X2}", number) 
   ' Display value with eight hexadecimal digits.
   Console.WriteLine("{0,14:X8}", number)
Next    
' The example displays the following output: 
'    -1403     -->         -1403     -1,403.0    FFFFFA85      FFFFFA85 
'    0         -->           000          0.0          00      00000000 
'    169       -->           169        169.0          A9      000000A9 
'    1483104   -->       1483104  1,483,104.0      16A160      0016A160

You can also format an Int32 value as a binary, octal, decimal, or hexadecimal string by calling the ToString(Int32, Int32) method and supplying the base as the method's second parameter. The following example calls this method to display the binary, octal, and hexadecimal representations of an array of integer values.

Dim numbers() As Integer = { -146, 11043, 2781913 }
Console.WriteLine("{0,8}   {1,32}   {2,11}   {3,10}", _
                  "Value", "Binary", "Octal", "Hex")
For Each number As Integer In numbers
   Console.WriteLine("{0,8}   {1,32}   {2,11}   {3,10}", _
                     number, Convert.ToString(number, 2), _
                     Convert.ToString(number, 8), _
                     Convert.ToString(number, 16))
Next       
' The example displays the following output: 
'       Value                             Binary         Octal          Hex 
'        -146   11111111111111111111111101101110   37777777556     ffffff6e 
'       11043                     10101100100011         25443         2b23 
'     2781913             1010100111001011011001      12471331       2a72d9

Working with Non-Decimal 32-Bit Integer Values

In addition to working with individual integers as decimal values, you may want to perform bitwise operations with integer values, or work with the binary or hexadecimal representations of integer values. Int32 values are represented in 31 bits, with the thirty-second bit used as a sign bit. Positive values are represented by using sign-and-magnitude representation. Negative values are in two's complement representation. This is important to keep in mind when you perform bitwise operations on Int32 values or when you work with individual bits. In order to perform a numeric, Boolean, or comparison operation on any two non-decimal values, both values must use the same representation.

All members of this type are thread safe. Members that appear to modify instance state actually return a new instance initialized with the new value. As with any other type, reading and writing to a shared variable that contains an instance of this type must be protected by a lock to guarantee thread safety.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

June 2010

Revised extensively.

Information enhancement.

Community Additions

ADD
Show:
© 2014 Microsoft