java.lang.NumberFormatException:
Solution.java, method main, line: 14
Error converting a string to a number (invalid format).
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:542)
at java.lang.Integer.parseInt(Integer.java:615)
at com.javarush.task.task04.task0412.Solution.main(Solution.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.javarush.task.common.model.execution.ExecuteService.callMainMethod(ExecuteService.java:78)
at com.javarush.task.common.model.execution.ExecuteService.execute(ExecuteService.java:102)
at com.javarush.task.app.execution.ExecutionService.execute(ExecutionService.java:107)
at com.javarush.task.app.execution.ExecutionService.main(ExecutionService.java:244)
at com.javarush.task.app.MainApplication.main(MainApplication.java:49)
package com.codegym.task.task04.task0412;
/*
Positive and negative numbers
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String num= reader.readLine();
int number=Integer.parseInt(num);
if (number>0){
number=number*2;
System.out.println(number);
}else if(number<0){
number=number+1;
System.out.println(number);
}else {
System.out.println("zero");
}
}
}