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uint (C# Reference)

The uint keyword denotes an integral type that stores values according to the size and range shown in the following table.

Type Range Size .NET Framework type


0 to 4,294,967,295

Unsigned 32-bit integer


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, like 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:


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.

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 on arithmetic expressions with mixed floating-point types and integral types, see float and double.

For more information on implicit numeric conversion rules, see the Implicit Numeric Conversions Table (C# Reference).

For more information, see the following sections in the C# Language Specification:

  • 1.3 Types and Variables

  • 4.1.5 Integral Types

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