TooSmall.java

public class TooSmall {
  public static void main(String[] args) {
    double start = 0.1;
    double tooSmall = 1.0e-18;
    for (int i = 0; i < 1_000_000_000; i++) {
      start += tooSmall;
    }
    System.out.println(start == 0.1); // TRUE
  }
}