I m working on a claw game sort of thing where the randomiza

Question

I m working on a claw game sort of thing where the randomization is dictated by my backend The backend returns between a 0 and 10 and this is the percentage of loser every time to winner every time 0 loser and 10 winner and everything else between is just a percent So ~5 is roughly 50 win lose rate I guess it d be easier if the server used 0 9 instead of 0 10 but yeah What s the best way to take an int and come up with a winPercentageRate based off of that

Vishnu Shrikar · Answer

your range is 0 10 so just divide by 10 Or 10 0 if you want more accuracy Then multiply by 100 and you have your percentage

Colton Idle · Answer

Once i have the percentage is there a stdlib method to get a boolean based on a random probability

Vishnu Shrikar · Answer

```Random nextInt 100 ```

Vishnu Shrikar · Answer

Use that and just check where the result falls in relation to ur percent

Francesc · Answer

`Random nextInt 100 ` gives you an Int in the 0 99 range both included it excludes 100 If you want to map 0 10 then you d have to use `Random nextInt 101 `

Vishnu Shrikar · Answer

Yes thats right whoops i forgot the range thing

Vishnu Shrikar · Answer

Wait I just read the docs the ranges are inclusive

Vishnu Shrikar · Answer

So the original 100 would be correct

Casey Brooks · Answer

Something like `Random nextInt 100 < randomWinPercentageAsInt` should do the job See example here <https pl kotl in ImlV8xKkY>

Francesc · Answer

``` Gets the next random non negative `Int` from the random number generator less than the specified until bound Generates an `Int` random value uniformly distributed between `0` inclusive and the specified until bound exclusive param until must be positive throws IllegalArgumentException if until is negative or zero sample samples random Randoms nextIntFromUntil public open fun nextInt until Int Int = nextInt 0 until ``` the upper limit is excluded

Klitos Kyriacou · Answer

You actually do need `nextInt 100 ` You want a value from 0 to 99 and then test it like this ```val won = Random nextInt 100 lt winPercentageRate``` If your rate is 50 then Random nextInt 100 returns a value between 0 and 99 There will be 50 such values between 0 and 49 and 50 such values between 50 and 99 giving an equal chance

Francesc · Answer

```enum class CatchResult Win Loss fun winOrLose val input Int 0 10 CatchResult val winFraction = input toDouble 10 0 val random = Random nextInt 101 val loses = random gt winFraction 100 0 toInt return if loses CatchResult Loss else CatchResult Win ```

Francesc · Answer

you can actually simplify all this ```fun winOrLose input Int 0 10 CatchResult val random = Random nextInt 11 val loses = random > input return if loses CatchResult Loss else CatchResult Win ```

Klitos Kyriacou · Answer

gt val random = Random nextInt 11 gt val loses = random gt input No if input = 10 it should win every time but if random is 10 it will lose You really need `nextInt 10 ` so between 0 and 9

Francesc · Answer

random is at most 10 so the ` gt ` is always false for input 10

Francesc · Answer

however it should be `val loses = input == 0 || random gt input`

Vishnu Shrikar · Answer

i think its random nextInt 10 >= input

Klitos Kyriacou · Answer

> random is at most 10 so the > is always false for input 10 You re right I had got it the wrong way around If input is 0 it should lose but if random is 0 it wins > ```val loses = input == 0 || random > input``` Introducing special cases is generally suspicious that something is wrong Here the probabilities are not evenly distributed It should be `random nextInt 10 >= input` as Vishnu said

Colton Idle · Answer

Glad it wasn t just me that was getting caught up in the details Maybe i need more coffee lol Thank you all < Casey Brooks> your example was amazing since it printed all of the rates and I could verify that things were working as expected thank you for teaching

Vishnu Shrikar · Answer

If you are young remember coffeee stunts your growth slightly smiling face but sometimes the simplest things are the hardest slightly smiling face

Colton Idle · Answer

Yeah I ended up writing something that had like 20 lines of code and I was like wait there has to be a better way then i started going down the route of looking up a probability stdlib in java kotlin then i just ended up posting here Glad that the solution was a one liner