[c#] What is the difference between “int” and “uint” / “long” and “ulong”?

u means unsigned, so ulong is a large number without sign. You can store a bigger value in ulong than long, but no negative numbers allowed.

A long value is stored in 64-bit,with its first digit to show if it's a positive/negative number. while ulong is also 64-bit, with all 64 bit to store the number. so the maximum of ulong is 2(64)-1, while long is 2(63)-1.

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