Why is Int32's maximum value 0x7FFFFFFF?

Question

I saw in MSDN documents that the maximum value of Int32 is 2,147,483,647, hexadecimal 0x7FFFFFFF.

I think, if it\'s Int32 it should store 32-bi

Answer 1

Because one bit is used to store the sign (Int32 can be less than zero).

http://en.wikipedia.org/wiki/Two%27s_complement