Need some help in java operators question

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This question was asked in my interview -

I need to use compound assignments to change the program.

class ArithmeticDemo {

    public static void main (String[] args){
          
        int result = 1 + 2; // result is now 3
        System.out.println(result);

        result = result - 1; // result is now 2
        System.out.println(result);

        result = result * 2; // result is now 4
        System.out.println(result);

        result = result / 2; // result is now 2
        System.out.println(result);

        result = result + 8; // result is now 10
        result = result % 7; // result is now 3
        System.out.println(result);

    }
}

What I have tried:

This is half the code I have tried in the interview -

class ArithmeticDemo {

    public static void main (String[] args){
        int result = 3;

I need help suggestions to complete this code. I tried to search on WEB but couldn't find anything on this and read some articles on Operators.

After intensive research found the answer on Oracle and on Scaler.

Posted 25-Apr-22 1:50am

Shruti Bongale

Updated 25-Apr-22 2:53am

v3

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Richard MacCutchan · Accepted Answer · 2022-04-25T02:07:00

Solution 1

You just need to apply all the operators in order, but use parentheses to counter the default precedence. See Operators (The Java™ Tutorials > Learning the Java Language > Language Basics)[^].

Posted 25-Apr-22 2:07am

Richard MacCutchan

OriginalGriff · Accepted Answer · 2022-04-25T02:24:00

Definitely follow Richard's advice, and read up on operators - this is basic stuff so if you don't know it all pretty well, you aren't going to pass a verbal interview even if you hand in a perfect result for this task!

Then write each bit with parentheses round it:

1 + 2
(1 + 2) - 1
((1 + 2) - 1) * 2
(((1 + 2) - 1) * 2) / 2
((((1 + 2) - 1) * 2) / 2) + 8
(((((1 + 2) - 1) * 2) / 2) + 8) % 7

Then think about it: what parentheses can you remove?
For example: a + b - c is the same as (a + b) - c and a + (b - c)
But a + b * c will give you different result depending on which way you evaluate it: (a + b) * c is not the same as a + (b * c) so the parentheses are important.

Stop panicking, and think about what is required of you: this isn't a complex task so it shouldn't be difficult for you.