Bitmask

This was a good discussion topic while I was still rAthena scripting moderator


Basically, script_commands.txt already explained quite well
I also had a template script to play around with it
prontera,155,187,4 script Guess the number 1_F_MARIA,{ .@bit = 4; // how many bits .@ans = rand( 1 << .@bit ); mes "Guess this number -> "+ .@ans; next; while (true) { for ( .@i = 0; .@i < .@bit; ++.@i ) .@menu$[.@i] = ( ( .@guess & 1<<.@i )? "^009900":"^FF0000" )+"2^"+ .@i +"^000000 -> "+( 1 << .@i ); .@s = select( implode( .@menu$, ":" ) ) -1; // .@guess ^= 1 << .@s; // can use this line if don't want to use IF-ELSE if ( .@guess & 1 << .@s ) .@guess &= ~(1 << .@s); else .@guess |= 1 << .@s; if ( .@guess == .@ans ) break; } mes "You got it !"; close; }

one example that explained not so well in script_commands.txt about getnameditem
basically, what he is trying to tell, is just like this
getitem2 Apple, 1, 1, 0, 0, 254, 0, getcharid(0) % 2**16, getcharid(0) / 2**16; .@charid = .@card4 * 2**16 + .@card3;

both Hercules and rAthena script engine has every script variable as int signed, which is 31 bits
but with this template provided by Keyworld, the upper limit becomes 2040 bits (255*8=2040)
I remember Keyworld said that might be useful for saving a player's skill tree into SQL table, but he never complete it