The questions seem a little bit confusing
package com.codegym.task.task04.task0412;
/*
Positive and negative numbers
*/
import java.util.Scanner;
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
//write your code here
Scanner num=new Scanner(System.in);
System.out.println("Enter a number");
int a=num.nextInt();
if (a > 0){
a*=2;
System.out.println(a);
} else if (a < 0){
a++;
System.out.println(a);
} else if (a == 0){
System.out.println(0);
}
}
}