What is the difference between “int” and “uint” / “long” and “ulong”?

c# types integer unsigned signed
Difference Engine picture Difference Engine · Sep 16, 2010 · Viewed 187k times · Source

I know about int and long (32-bit and 64-bit numbers), but what are uint and ulong?

Answer

Isak Savo picture Isak Savo · Sep 16, 2010

The primitive data types prefixed with "u" are unsigned versions with the same bit sizes. Effectively, this means they cannot store negative numbers, but on the other hand they can store positive numbers twice as large as their signed counterparts. The signed counterparts do not have "u" prefixed.

The limits for int (32 bit) are:

int: –2147483648 to 2147483647 
uint: 0 to 4294967295

And for long (64 bit):

long: -9223372036854775808 to 9223372036854775807
ulong: 0 to 18446744073709551615

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