torsten could you check that all your examples are really covered in the deepintopharo chapter about little numbers? Else we should add them.
Stef On 06 Feb 2014, at 16:08, Torsten Bergmann <asta...@gmx.de> wrote: > Hi Pablo, > > can you be more specific why you need a BitSet class other than convinience? > What do you > want to do? > > Note that for bit handling in Smalltalk you can easily just send messages to > integers > or large integers: > > Access bits: 12 bitAt: 1 -> 0 > Modify bits: 12 bitAt: 1 put: 1 -> 13 > Print binary: 12 printStringBase: 2 -> '1100' > Print hex: 12 printStringBase: 16 -> 'C' > Large number: 67677557657 printStringBase: 2 -> > '111111000001111001011001001110011001' > > There are also #bitAnd:, #bitOr:, #bitXor: messages: > > 12 bitOr: 1 -> 13 > 12 bitAnd: 8 -> 8 > > and you can use the abbreviations known from C world: > > 12 | 1 -> 13 > 12 & 1 -> 0 > > If you want to see the bit representation just print as a string with base 2: > > 12 | 2 printStringBase: 2 -> '1110' > > So for octal use: > > 12 | 2 printStringBase: 8 -> '16' > > If you disklike to stay in decimal system you should be aware that in > Smalltalk you can easily write a number in different bases directly > using the "BASE, followed by r followed by number" representation. > > So you can for example write: > > 12 > as 2r1100 > as 16rC > as 10r12 (decimal again) > as 8r14 (octal) > or any other base that you like directly > > With this you can also easily manipulate bits while writing in bit > representation: > > 2r0001 bitOr: 2r0101 -> 5 > same as: 2r0001 | 2r0101 -> 5 > > when you need the result again as bits: > > (2r0001 | 2r0101) printStringBase: 2 -> '101' > > Many other convinience methods are there like: > 12 hex -> '16rC' > 12 printStringHex -> 'C' > $A hex -> '16r41' > $A printStringHex -> '41' > > Feel free to mix all that > > (16rFF00 | 2r00001) hex -> '16rFF01' > > Try to get used to these methods and you will have fun with bits > in Pharo Smalltalk easily. > > If you need something more tell us, a BitSet class implementation > could be easily written using the above as a base. > > Bye > T. > > > > > > > >
