Programming - calculating max value for data type

[QuickBreakdown 1948]

Some useful formula I came across while studying. You can calculate the maximum value for pretty much any data type in most cases.

Though this appears to be pretty basic stuff, I thought i'd share it with you.

 

Formula : 2^(n-1)-1 (signed)

              2^(n-1) (unsigned)

 

N = Amount of bits

^ = Power

 

For example in Java an integer is 4 bytes which is 32 bits. (1 byte = 8 bits).

 

2^(32-1)-1 = 2147483647 as maximum value for an integer (signed) or -2147483648 (unsigned)

[Azeri 139]

I learned this formula for my school leaving exams :p And a lot other at arithmetics, but I don't use it anymore, because business IT D:

 

But it is useful!