Compiling error

  • 13 years ago

    Hi, I am having problems when I call getUnion.
    The error message are "getUnion(IntergerSet) in IntergerSet cannot be applied to ()" and "incompatible types"
    where the arrows are.
    Here is my code:

    public void inputSet ()
      Scanner input = new Scanner (;
         int value;
         boolean arraySet[] = new boolean[100];
          System.out.println("\nPlease enter a value or -1 to finish: ");
          value = input.nextInt();
           arraySet[value] = true;
           System.out.printf("\nYou enter %d to finish entering values", value, "\n");
         }while(value != -1);
         System.out.println("\n\nIf you want to find the union of two sets press 'u': ");
            String unionSets =;
    --->         System.out.printf("\nUNION", getUnion());
        //Finding the union of two sets
        public String getUnion(IntergerSet other)
         IntergerSet res = new IntergerSet();
         for(int i=0; i<SIZE; i++) 
          res.arraySet[i] = this.arraySet[i]||other.arraySet[i];
    --->     return res;

  • 13 years ago

    There is no overloaded form of getUnion which takes 0 parameters. you only have one which takes 1 parameter. System.out.printf("\nUNION", getUnion()); generates an error because you make a call to getUnion without passing it any argument.

    return res; fails because the type of the method is String and you're trying to return an IntergerSet. change the type of the function to either IntergetSet or make the function return a string. Or overload the toString() method in IntergerSet to make it return what you would view as a string interpretation of the class and then add res.toString() as return.

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