This article provides supplementary remarks to the reference documentation for this API.
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). .NET also includes an unsigned 32-bit integer value type, UInt32, which represents values that range from 0 to 4,294,967,295.
Instantiate an Int32 valueYou 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.
int number1 = 64301;
int number2 = 25548612;
let number1 = 64301
let number2 = 25548612
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 but does require one in F#.
sbyte value1 = 124;
short value2 = 1618;
int number1 = value1;
int number2 = value2;
let value1 = 124y
let value2 = 1618s
let number1 = int value1
let number2 = int value2
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# or F#, 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.
long lNumber = 163245617;
try {
int number1 = (int) lNumber;
Console.WriteLine(number1);
}
catch (OverflowException) {
Console.WriteLine($"{lNumber} is out of range of an Int32.");
}
double dbl2 = 35901.997;
try {
int number2 = (int) dbl2;
Console.WriteLine(number2);
}
catch (OverflowException) {
Console.WriteLine($"{dbl2} is out of range of an Int32.");
}
BigInteger bigNumber = 132451;
try {
int number3 = (int) bigNumber;
Console.WriteLine(number3);
}
catch (OverflowException) {
Console.WriteLine($"{bigNumber} is out of range of an Int32.");
}
// The example displays the following output:
// 163245617
// 35902
// 132451
let lNumber = 163245617L
try
let number1 = int lNumber
printfn $"{number1}"
with :? OverflowException ->
printfn "{lNumber} is out of range of an Int32."
let dbl2 = 35901.997
try
let number2 = int dbl2
printfn $"{number2}"
with :? OverflowException ->
printfn $"{dbl2} is out of range of an Int32."
let bigNumber = BigInteger 132451
try
let number3 = int bigNumber
printfn $"{number3}"
with :? OverflowException ->
printfn $"{bigNumber} is out of range of an Int32."
// The example displays the following output:
// 163245617
// 35902
// 132451
Dim lNumber As Long = 163245617
Try
Dim number1 As Integer = CInt(lNumber)
Console.WriteLine(number1)
Catch e As OverflowException
Console.WriteLine("{0} is out of range of an Int32.", lNumber)
End Try
Dim dbl2 As Double = 35901.997
Try
Dim number2 As Integer = CInt(dbl2)
Console.WriteLine(number2)
Catch e As OverflowException
Console.WriteLine("{0} is out of range of an Int32.", dbl2)
End Try
Dim bigNumber As BigInteger = 132451
Try
Dim number3 As Integer = CInt(bigNumber)
Console.WriteLine(number3)
Catch e As OverflowException
Console.WriteLine("{0} is out of range of an Int32.", bigNumber)
End Try
' The example displays the following output:
' 163245617
' 35902
' 132451
You can call a method of the Convert class to convert any supported type to an Int32 value. This is possible because Int32 supports the IConvertible interface. The following example illustrates the conversion of an array of Decimal values to Int32 values.
decimal[] values= { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
199.55m, 9214.16m, Decimal.MaxValue };
int result;
foreach (decimal value in values)
{
try {
result = Convert.ToInt32(value);
Console.WriteLine($"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}.");
}
catch (OverflowException) {
Console.WriteLine($"{value} is outside the range of the Int32 type.");
}
}
// 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.
let values =
[| Decimal.MinValue; -1034.23M; -12m; 0M; 147M
199.55M; 9214.16M; Decimal.MaxValue |]
for value in values do
try
let result = Convert.ToInt32 value
printfn $"Converted the {value.GetType().Name} value '{value}' to the {result.GetType().Name} value {result}."
with :? OverflowException ->
printfn $"{value} is outside the range of the Int32 type."
// 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.
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.
string string1 = "244681";
try {
int number1 = Int32.Parse(string1);
Console.WriteLine(number1);
}
catch (OverflowException) {
Console.WriteLine($"'{string1}' is out of range of a 32-bit integer.");
}
catch (FormatException) {
Console.WriteLine($"The format of '{string1}' is invalid.");
}
string string2 = "F9A3C";
try {
int number2 = Int32.Parse(string2,
System.Globalization.NumberStyles.HexNumber);
Console.WriteLine(number2);
}
catch (OverflowException) {
Console.WriteLine($"'{string2}' is out of range of a 32-bit integer.");
}
catch (FormatException) {
Console.WriteLine($"The format of '{string2}' is invalid.");
}
// The example displays the following output:
// 244681
// 1022524
let string1 = "244681"
try
let number1 = Int32.Parse string1
printfn $"{number1}"
with
| :? OverflowException ->
printfn "'{string1}' is out of range of a 32-bit integer."
| :? FormatException ->
printfn $"The format of '{string1}' is invalid."
let string2 = "F9A3C"
try
let number2 = Int32.Parse(string2, System.Globalization.NumberStyles.HexNumber)
printfn $"{number2}"
with
| :? OverflowException ->
printfn $"'{string2}' is out of range of a 32-bit integer."
| :? FormatException ->
printfn $"The format of '{string2}' is invalid."
// The example displays the following output:
// 244681
// 1022524
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
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 CompareTo or Equals 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.
Represent an Int32 as a stringThe 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 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.
int[] numbers = { -1403, 0, 169, 1483104 };
foreach (int number 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);
}
// 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
let numbers = [| -1403; 0; 169; 1483104 |]
for number in numbers do
// Display value using default formatting.
printf $"{number,-8} --> "
// Display value with 3 digits and leading zeros.
printf $"{number,11:D3}"
// Display value with 1 decimal digit.
printf $"{number,13:N1}"
// Display value as hexadecimal.
printf $"{number,12:X2}"
// Display value with eight hexadecimal digits.
printfn $"{number,14:X8}"
// 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
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.
int[] numbers = { -146, 11043, 2781913 };
Console.WriteLine("{0,8} {1,32} {2,11} {3,10}",
"Value", "Binary", "Octal", "Hex");
foreach (int number 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));
}
// The example displays the following output:
// Value Binary Octal Hex
// -146 11111111111111111111111101101110 37777777556 ffffff6e
// 11043 10101100100011 25443 2b23
// 2781913 1010100111001011011001 12471331 2a72d9
let numbers = [| -146; 11043; 2781913 |]
printfn $"""{"Value",8} {"Binary",32} {"Octal",11} {"Hex",10}"""
for number in numbers do
printfn $"{number,8} {Convert.ToString(number, 2),32} {Convert.ToString(number, 8),11} {Convert.ToString(number, 16),10}"
// The example displays the following output:
// Value Binary Octal Hex
// -146 11111111111111111111111101101110 37777777556 ffffff6e
// 11043 10101100100011 25443 2b23
// 2781913 1010100111001011011001 12471331 2a72d9
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
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.
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