Cheat Engine

sangeli · Posted: Fri Jul 23, 2010 7:11 pm Post subject: finding a tricky value

lets say a game stored money like this:

money = (real_value + 4) * 3 * -1^real_value;

so when the real amount of money is 3 the stored value is -21 and 6 is 30 etc etc

how would you find the pattern/address for that variable with CE? its hard to predict but easy to do in a program.

Dark Byte · Posted: Fri Jul 23, 2010 7:24 pm Post subject:

changed/unchanged scans and experimenting with freezing/editing groups of addresses and check what happens

Most often an increased/decrease will find it as well

Off-topic:
here's a nice exercise in math,
Write a formula that converts money back to real_value from the example formula of :"money = (real_value + 4) * 3 * -1^real_value;"

sangeli · Posted: Fri Jul 23, 2010 9:03 pm Post subject:

i tried and failed. log base -1 melted my brain

XaLeX · Posted: Sat Jul 24, 2010 3:25 am Post subject:

it's not very elegant, but you can read (-1^x) as (x%2?-1:1).

justa_dude · Posted: Sat Jul 24, 2010 3:28 am Post subject:

There are plenty of cases where functions must be defined in a piecewise fashion. No big deal. The only alternative expression I'm aware of is using Lambert's W, and it's much uglier (and much less useful).