int (C# Reference)


Updated: July 20, 2015

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

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

TypeRangeSize.NET Framework typeDefault Value
int-2,147,483,648 to 2,147,483,647Signed 32-bit integerSystem.Int320

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

int i = 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:

// '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 C# Language Specification. The language specification is the definitive source for C# syntax and usage.

C# Reference
C# Programming Guide
C# Keywords
Integral Types Table
Built-In Types Table
Implicit Numeric Conversions Table
Explicit Numeric Conversions Table