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: –2.147.483.648 to 2.147.483.647
uint: 0 to 4.294.967.295
And for long (64-bit):
long: -9.223.372.036.854.775.808 to 9.223.372.036.854.775.807
ulong: 0 to 18.446.744.073.709.551.615