truncate

Rounds the given value x to an integer towards zero.

expect fun truncate(x: Double): Double(source)

import kotlin.math.truncate

fun main() {
    val values = listOf(3.7, -3.7, 0.0, 5.0, -2.3)

    for (v in values) {
        println("truncate($v) = ${truncate(v)}")
    }
}

Source