System.Int32 Structure

Represents a 32-bit signed integer.

See Also: Int32

Syntax

[System.Runtime.InteropServices.ComVisible(true)]
public struct Int32 : IComparable, IComparable<int>, IConvertible, IEquatable<int>, IFormattable

Remarks

Int32 is an immutable value type that represents signed integers with values that range 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.

    code reference: System.Int32.Instantiation#1

  • 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.

    code reference: System.Int32.Instantiation#4

  • 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.

    code reference: System.Int32.Instantiation#2

  • 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.

    code reference: System.Convert.ToInt32#4

  • You can call the Int32.Parse(String) or Int32.TryParse(String,Int32) 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.

    code reference: System.Int32.Instantiation#3

Performing Operations on Int32 Values

The Int32 type supports standard mathematical operations such as addition, subtraction, division, multiplication, 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 Int32.CompareTo(Int32) or Int32.Equals(Int32) method.

You can also call the members of the Math class to perform a wide range of numeric operations, including getting the absolute value of a number, calculating the quotient and remainder from integral division, determining the maximum or minimum value of two integers, getting the sign of a number, and rounding a number.

Representing an Int32 as a String

The Int32 type provides full support for standard and custom numeric format strings. (For more information, see Formatting Types, 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 Int32.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.

code reference: System.Int32.Formatting#1

You can also format an Int32 value as a binary, octal, decimal, or hexadecimal string by calling the Convert.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.

code reference: System.Int32.Formatting#2

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.

Thread Safety

This type is safe for multithreaded operations.

Requirements

Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0

The members of System.Int32 are listed below.

See Also: ValueType

Public Fields

const
MaxValueInt32 (2147483647).

Represents the largest possible value of an Int32. This field is constant.

const
MinValueInt32 (-2147483648).

Represents the smallest possible value of Int32. This field is constant.

Public Methods

CompareTo(Int32) : Int32

Compares this instance to a specified 32-bit signed integer and returns an indication of their relative values.

CompareTo(Object) : Int32

Compares this instance to a specified object and returns an indication of their relative values.

Equals(Int32) : Boolean

Returns a value indicating whether this instance is equal to a specified Int32 value.

override
Equals(Object) : Boolean

Returns a value indicating whether this instance is equal to a specified object.

override
GetHashCode() : Int32

Returns the hash code for this instance.

GetTypeCode() : TypeCode

Returns the TypeCode for value type Int32.

static
Parse(String) : Int32

Converts the string representation of a number to its 32-bit signed integer equivalent.

static
Parse(String, NumberStyles) : Int32

Converts the string representation of a number in a specified style to its 32-bit signed integer equivalent.

static
Parse(String, IFormatProvider) : Int32

Converts the string representation of a number in a specified culture-specific format to its 32-bit signed integer equivalent.

static
Parse(String, NumberStyles, IFormatProvider) : Int32

Converts the string representation of a number in a specified style and culture-specific format to its 32-bit signed integer equivalent.

override
ToString() : String

Converts the numeric value of this instance to its equivalent string representation.

ToString(IFormatProvider) : String

Converts the numeric value of this instance to its equivalent string representation using the specified culture-specific format information.

ToString(String) : String

Converts the numeric value of this instance to its equivalent string representation, using the specified format.

ToString(String, IFormatProvider) : String

Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information.

static
TryParse(String, out Int32) : Boolean
static
TryParse(String, NumberStyles, IFormatProvider, out Int32) : Boolean

Explicitly Implemented Interface Members

Int32$IConvertible.ToBoolean(IFormatProvider)

For a description of this member, see IConvertible.ToBoolean(IFormatProvider).

Int32$IConvertible.ToByte(IFormatProvider)

For a description of this member, see IConvertible.ToByte(IFormatProvider).

Int32$IConvertible.ToChar(IFormatProvider)

For a description of this member, see IConvertible.ToChar(IFormatProvider).

Int32$IConvertible.ToDateTime(IFormatProvider)

This conversion is not supported. Attempting to use this method throws an InvalidCastException.

Int32$IConvertible.ToDecimal(IFormatProvider)

For a description of this member, see IConvertible.ToDecimal(IFormatProvider).

Int32$IConvertible.ToDouble(IFormatProvider)

For a description of this member, see IConvertible.ToDouble(IFormatProvider).

Int32$IConvertible.ToInt16(IFormatProvider)

For a description of this member, see IConvertible.ToInt16(IFormatProvider).

Int32$IConvertible.ToInt32(IFormatProvider)

For a description of this member, see IConvertible.ToInt32(IFormatProvider).

Int32$IConvertible.ToInt64(IFormatProvider)

For a description of this member, see IConvertible.ToInt64(IFormatProvider).

Int32$IConvertible.ToSByte(IFormatProvider)

For a description of this member, see IConvertible.ToSByte(IFormatProvider).

Int32$IConvertible.ToSingle(IFormatProvider)

For a description of this member, see IConvertible.ToSingle(IFormatProvider).

Int32$IConvertible.ToType(Type,IFormatProvider)

For a description of this member, see IConvertible.ToType(Type,IFormatProvider).

Int32$IConvertible.ToUInt16(IFormatProvider)

For a description of this member, see IConvertible.ToUInt16(IFormatProvider).

Int32$IConvertible.ToUInt32(IFormatProvider)

For a description of this member, see IConvertible.ToUInt32(IFormatProvider).

Int32$IConvertible.ToUInt64(IFormatProvider)

For a description of this member, see IConvertible.ToUInt64(IFormatProvider).