int (C# Reference)
The int keyword denotes an integral type that stores values according to the size and range shown in the following table.
.NET Framework type
-2,147,483,648 to 2,147,483,647
Signed 32-bit integer
You can declare and initialize a variable of the type int like this example:
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:
// '123' is an int, so an implicit conversion takes place here:
float f = 123;
There is a predefined implicit conversion from sbyte, byte, short, ushort, or char to int. For example, the following assignment statement will produce a compilation error without a cast:
long aLong = 22;
int i1 = aLong; // Error: no implicit conversion from long.
int i2 = (int)aLong; // 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 more information on arithmetic expressions with mixed floating-point types and integral types, see float and double.
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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