Why Int64 and UInt64 are of same size

Question

I'm asking in context of C#. Why both Int64 and UInt64 are of same size i.e. 64-bits. Same goes to other Int variables also.

I was expecting UInt to be smaller in size at least a bit as it do not need to represent the - sign, am I expecting some illogical thing here?

Answer 1

The 64 in Int64 and UInt64 means the size of the integer is 64 bits. That's why they are the same size.

The size is the same, but range is different (also due to the significant bit):

• UInt64: 0 to 18,446,744,073,709,551,615;
• Int64: -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.