Guys, i write a code for a program that have money...

# getting-started

[dvlwj]

Guys, i write a code for a program that have money on it, i am using Match.ceil feature for this, to predict they payment the buyer gonna use.

The problem is for use Match.ceil i need to have the number in float, but then i read this https://stackoverflow.com/a/3730040 , which is telling that a bad one to use float for financial purpose.

What i need to do?

My code is something like this :

val a: Double = valueInput1.toDouble()
    val b: Double = 5000.toDouble()
    val c = Math.ceil(a/b)*5000
    println(c)

[Shawn]

Are you writing this for the JVM?

[dvlwj]

Android precisely @Shawn

[Shawn]

Did you read the SO answer?

[dvlwj]

sorry, but what is SO? StackOverflow?
yes i read them

[dvlwj]

i have some plan on my mind,
to have things run like how my example code in here then transform it to BigDecimal and then save it to my Database, but i just worried if my logic is correct or not

[Shawn]

if at any point you call .toDouble() you lose the precision you would have with BigDecimal

[dvlwj]

And i think i can to make it BigDecimal from the start, but AFAIK Match.ceil only can process Double 😐

[Shawn]

It’s Math.ceil

[Shawn]

like Mathematics, firstly

[Shawn]

Secondly, BigDecimal provides setScale, which you can use to perform rounding operations

[dvlwj]

okay i think im wrong in here, can you eli5 me Shawn?

[dvlwj]

seems like your answer and think is something that i doesn't think possible before.

[Shawn]

To round a given BigDecimal to int like you would with Math.ceil(), you’d need something that looks kinda like this

val intValue = bigDecimal.setScale(0, RoundingMode.CEILING).intValueExact()

[Shawn]

But this isn’t Kotlin-related. You just need to read through the BigDecimal docs. https://developer.android.com/reference/java/math/BigDecimal

[Shawn]

If you perform this rounding operation a lot, this would maybe be a good candidate for an extension fun.

[dvlwj]

hmm, seems interesting,

thanks @Shawn i gonna try this