I chcecked this task with 2 files in my desktop. Everything was fine.
package pl.codegym.task.task18.task1820;
/*
Zaokrąglanie liczb
*/
import java.io.*;
import java.util.Scanner;
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String sFile1 = reader.readLine();
String sFile2 = reader.readLine();
FileInputStream file1 = new FileInputStream(sFile1); //("C:\\Users\\Desktop\\liczby.txt");
FileOutputStream file2 = new FileOutputStream(sFile2); ///("C:\\Users\\Desktop\\liczby2.txt");
Scanner sc = new Scanner(file1);
while(sc.hasNext()) {
String sSc = sc.next();
double x = Double.parseDouble(sSc);
int y = (int)x;
if(y > 0)
{
if(x-y >= 0.5)
file2.write(y + 49);
else
file2.write(y+48);
file2.write(32);
}
else
{
if(y - x > 0.5)
{
file2.write(45);
file2.write(Math.abs(y) + 49);
}
else
{
file2.write(45);
file2.write(Math.abs(y) + 48);
}
file2.write(32);
}
}
file1.close();
file2.close();
sc.close();
}
}