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

In a 2's complement signed n-bit type, the range is from -2^n-1 to 2^n-1-1 because with n bits you can represent 2ⁿ different values, half of which is used for signed numbers because of the sign bit. The remaining 2^n-1 half is used for non-negative number. Since one is used for 0, there are only 2^n-1-1 remaining values for positive numbers