uint (C# Reference)
The uint keyword signifies an integral type that stores values according to the size and range shown in the following table.
Type |
Range |
Size |
.NET Framework type |
|---|---|---|---|
uint |
0 to 4,294,967,295 |
Unsigned 32-bit integer |
Note The uint type is not CLS-compliant. Use int whenever possible.
Literals
You can declare and initialize a variable of the type uint like this example:
uint myUint = 4294967290;
When an integer literal has no suffix, its type is the first of these types in which its value can be represented: int, uint, long, ulong. In this example, it is uint:
uint uInt1 = 123;
You can also use the suffix u or U, such as this:
uint uInt2 = 123U;
When you use the suffix U or u, the type of the literal is determined to be either uint or ulong according to the numeric value of the literal. For example:
Console.WriteLine(44U.GetType());
Console.WriteLine(323442434344U.GetType());
This code displays System.UInt32, followed by System.UInt64 -- the underlying types for uint and ulong respectively -- because the second literal is too large to be stored by the uint type.
Conversions
There is a predefined implicit conversion from uint to long, ulong, float, double, or decimal. For example:
float myFloat = 4294967290; // OK: implicit conversion to float
There is a predefined implicit conversion from byte, ushort, or char to uint. Otherwise you must use a cast. For example, the following assignment statement will produce a compilation error without a cast:
long aLong = 22;
// Error -- no implicit conversion from long:
uint uInt1 = aLong;
// OK -- explicit conversion:
uint uInt2 = (uint)aLong;
Notice also that there is no implicit conversion from floating-point types to uint. For example, the following statement generates a compiler error unless an explicit cast is used:
// Error -- no implicit conversion from double:
uint x = 3.0;
// OK -- explicit conversion:
uint y = (uint)3.0;
For information about arithmetic expressions with mixed floating-point types and integral types, see float and double.
For more information about implicit numeric conversion rules, see the Implicit Numeric Conversions Table (C# Reference).
C# Language Specification
For more information, see the C# Language Specification. The language specification is the definitive source for C# syntax and usage.
See Also
Reference
Integral Types Table (C# Reference)
Built-In Types Table (C# Reference)
Implicit Numeric Conversions Table (C# Reference)
Explicit Numeric Conversions Table (C# Reference)