There are several ways to specify integer literals in C#. The type is inferred from the value specified. The type used will be the first type in the following list that the literal fits into: int, uint, long or ulong. A suffix can also be used to help indicate the type of the literal.
Types chosen based on suffix (in order preferred):
- u suffix – uint, ulong
- l suffix – long, ulong
- ul suffix – ulong
Here are a few examples:
// Decimal literals, suffixes
object o1 = 42; // int
object o2 = 2147483647; // int
object o3 = 2147483648; // uint
uint u1 = 2; // uint
object u2 = 100U; // uint
object o4 = 4294967296; // long
object o5 = 4294967296U; // ulong
object o6 = 42L; // long
object o7 = 9223372036854775808L; // ulong
object o8 = 42UL; // ulong
int n1 = 003;
// Hexadecimal literals
int x1 = 0x1A2; // 418
object o12 = 0xFFFFFFFF; // 4294967295 uint
object o13 = 0xFUL; // 15, ulong
Lowercase suffixes are allowed, but you should use uppercase for clarity.