import kotlin.math.abs
import kotlin.math.sqrt

fun approxEquals(value: Double, other: Double, epsilon: Double): Boolean {
    return abs(value - other) < epsilon
}

fun test(a: Double, b: Double) {
    val epsilon = 1e-18
    println("$a, $b => ${approxEquals(a, b, epsilon)}")
}

fun main() {
    test(100000000000000.01, 100000000000000.011)
    test(100.01, 100.011)
    test(10000000000000.001 / 10000.0, 1000000000.0000001000)
    test(0.001, 0.0010000001)
    test(0.000000000000000000000101, 0.0)
    test(sqrt(2.0) * sqrt(2.0), 2.0)
    test(-sqrt(2.0) * sqrt(2.0), -2.0)
    test(3.14159265358979323846, 3.14159265358979324)
}