Why does this code give me an error code because of possibly lossy conversion and this one doesnt?

Question

This one works:
import java.util.Scanner;

public class Program
{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int amount = scanner.nextInt();
//your code goes here
int x = 0;
int newAmount = amount;
while (x < 3){
newAmount = newAmount - newAmount / 10;
x++;
}
System.out.println(newAmount);
}
}

But this one doesnt:
import java.util.Scanner;

public class Program
{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int amount = scanner.nextInt();
//your code goes here
int x = 0;
int newAmount = amount;
while (x < 3){
newAmount = newAmount - newAmount * 0.1;
x++;
}
System.out.println(newAmount);
}
}

Answer 1

By multiplying with 0.1 the result becomes double. However, newAmount is defined as integer. Therefore the error.

Answer 2

At first glance, looks to be because you're using a double in the second one when it's of int type. Just convert it and it should work fine.

Answer 3

https://code.sololearn.com/ca1135a15A8a

import java.util.Scanner;

public class Program
{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int amount = scanner.nextInt();
//your code goes here
int x = 0;
double newAmount = amount;
while (x < 3){
newAmount = newAmount - newAmount * 0.1;
x++;
}
System.out.println(newAmount);
}
}