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The int 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
int -2,147,483,648 to 2,147,483,647 Signed 32-bit integer System.Int32


You can declare and initialize a variable of the type int like this example:

int myInt = 123;

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 of the type int.


There is a predefined implicit conversion from int to long, float, double, or decimal. For example:

float myFloat = 123;   // OK: implicit conversion to float

There is a predefined implicit conversion from sbyte, byte, short, ushort, or char to int. For example, if you have a long variable, myLong, the following assignment statement will produce a compilation error without a cast:

long myLong = 22;
int myInt = myLong;       // Error: no implicit conversion from long
int myInt = (int)myLong;  // OK: explicit conversion

Notice also that there is no implicit conversion from floating-point types to int. For example, the following statement generates a compiler error unless an explicit cast is used:

int x = 3.0;         // Error: no implicit conversion from double
int y = (int)3.0;    // OK: explicit conversion

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

See Also

C# Keywords | Integral Types Table | Built-in Types Table | Implicit Numeric Conversions Table | Explicit Numeric Conversions Table | Int32 Structure

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