Format number using decimal format in kotlin

val num = 1.34567
val df = DecimalFormat("#.##")
df.roundingMode = RoundingMode.CEILING

println(df.format(num))

When you run the program, the output will be: 1.34

Check: https://www.programiz.com/kotlin-programming/examples/round-number-decimal

This is the format you need:

val dec = DecimalFormat("#,###.##")

will print:

5.384,45

if you need always exactly 2 digits after the decimal point:

val dec = DecimalFormat("#,###.00") 

Used:

%.numberf

fun main(args: Array<String>) {
var A: Double
A = readLine()!!.toDouble()
var bla = A*A
var calculator = 3.14159 * bla
println("A=%.4f".format(calculator))
}