public static void incrementValue(int x) {
        x = x +1;
    }
    //What ever variable is passed into the function will NOT be changed
    //e.g. we pass variable y = 1 -> function call -> result: y=l

    public static void incrementValue(int[] arr) {
        for (int i = 0; i < arr.length; i++) {
            arr[i]+=1;
        }
    }
    //What ever variable is passed into the function WILL be changed
    //e.g. we pass variable int[] y = int{1,2} -> function call -> result: y = int{2,3}