Question

Currently in my program I am trying to use and if else statement to choose either to add or subtract. I'm calling eitehr my addition method or my subtraction method in the statemenet. However i keep getting an error. "

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Exception in thread "main" java.lang.Error: Unresolved compilation problem:

at ArithmeticOperators.main(ArithmeticOperators.java:19)"

I'm not sure what is causing this at all, below is my code.

import java.util.*;

public class ArithmeticOperators{

public LinkedList head;

private static Scanner userChoice;

public String toString() {
        String result = "";
        LinkedList current = head;
        while(current.getFirst() != null){
            current = (LinkedList) current.getFirst();
        }
        return "List: " + result;
  }

public static void main(String[]args){

//mC stands for Math Choice
Scanner mC = new Scanner(System.in);
System.out.println("Enter your choice");
System.out.println("You can add or subtract");
String choice = mC.nextLine();

if(choice.equals("add")){
  Addition(result);
}else if(choice.equals("minus")){
  Subtraction(result2);}
System.out.println("Please choose FIVE numbers to add or subtract,");
}
public static int result;
public static int result2;

public static int Addition(int list){
  
  
  userChoice = new Scanner(System.in);
  LinkedList<Integer> aL = new LinkedList<Integer>();
  
  int a = userChoice.nextInt();
  int b = userChoice.nextInt();
  int c = userChoice.nextInt();
  int d = userChoice.nextInt();
  int e = userChoice.nextInt();
  
  aL.add(a);
  aL.add(b);
  aL.add(c);
  aL.add(d);
  aL.add(e);
  result = a + b + c + d + e;
  System.out.println("The elements of your list are:" + aL.toString());
  System.out.println("The result of your numbers are: " + result);
  return result;
  
  }

public static int Subtraction(int list){
  
  
  userChoice = new Scanner(System.in);
  LinkedList<Integer> aL = new LinkedList<Integer>();
  
  int a = userChoice.nextInt();
  int b = userChoice.nextInt();
  int c = userChoice.nextInt();
  int d = userChoice.nextInt();
  int e = userChoice.nextInt();
  
  aL.add(a);
  aL.add(b);
  aL.add(c);
  aL.add(d);
  aL.add(e);
  result = a - b - c - d - e;
  System.out.println("The elements of your list are:" + aL.toString());
  System.out.println("The result of your numbers are: " + result);
  return result2;

  

}

Answer 1

Hi buddy, I've identified one mistake in your code. You haven't given closing braces at the end of the java class. Here is the corrected code and the output.

import java.util.*;

public class ArithmeticOperators{

public LinkedList head;

private static Scanner userChoice;

public String toString() {
        String result = "";
        LinkedList current = head;
        while(current.getFirst() != null){
            current = (LinkedList) current.getFirst();
        }
        return "List: " + result;
}

public static void main(String[]args){

//mC stands for Math Choice
Scanner mC = new Scanner(System.in);
System.out.println("Enter your choice");
System.out.println("You can add or subtract");
String choice = mC.nextLine();

if(choice.equals("add")){
Addition(result);
}else if(choice.equals("minus")){
Subtraction(result2);}
System.out.println("Please choose FIVE numbers to add or subtract,");
}
public static int result;
public static int result2;

public static int Addition(int list){


userChoice = new Scanner(System.in);
LinkedList<Integer> aL = new LinkedList<Integer>();

int a = userChoice.nextInt();
int b = userChoice.nextInt();
int c = userChoice.nextInt();
int d = userChoice.nextInt();
int e = userChoice.nextInt();

aL.add(a);
aL.add(b);
aL.add(c);
aL.add(d);
aL.add(e);
result = a + b + c + d + e;
System.out.println("The elements of your list are:" + aL.toString());
System.out.println("The result of your numbers are: " + result);
return result;

}

public static int Subtraction(int list){


userChoice = new Scanner(System.in);
LinkedList<Integer> aL = new LinkedList<Integer>();

int a = userChoice.nextInt();
int b = userChoice.nextInt();
int c = userChoice.nextInt();
int d = userChoice.nextInt();
int e = userChoice.nextInt();

aL.add(a);
aL.add(b);
aL.add(c);
aL.add(d);
aL.add(e);
result = a - b - c - d - e;
System.out.println("The elements of your list are:" + aL.toString());
System.out.println("The result of your numbers are: " + result);
return result2;
}

}

OUTPUT:

D:\>java ArithmeticOperators
Enter your choice
You can add or subtract
add
3
5
6
8
6
The elements of your list are:[3, 5, 6, 8, 6]
The result of your numbers are: 28
Please choose FIVE numbers to add or subtract,

D:\>java ArithmeticOperators
Enter your choice
You can add or subtract
minus
5
1
2
4
3
The elements of your list are:[5, 1, 2, 4, 3]
The result of your numbers are: -5
Please choose FIVE numbers to add or subtract,