Same variables in a class function

[Randy Tong]

What are all num referring to ?

class Sample {
  int num;

  void method() {
    num = 1;
    int num = num = 2;
    num = 3;
  }
}

[Knute Snortum]

Tell us what you think the answer is and why.

[Campbell Ritchie]

And why did you call method() a class function?

[Iryna Chakraborty]

Randy Tong wrote:What are all num referring to ?

class Sample {
  int num;

  void method() {
    num = 1;
    int num = num = 2;
    num = 3;
  }
}

As I see it: second variable 'num' in line 6 - is initialized with self assignment. It means assignments of a variable to itself.
So, it is redundant and should be removed as it doesn't have any effect and it is completely unnecessary.

[Campbell Ritchie]

It is the sort of thing that might come up in exams; it is necessary for OP, if he hasn't forgotten he asked this question three weeks ago, to understand how the code works and what the value/s is/are at the end of a run of that method.
Of course, I have an idea what a hightly optimised version of that code might do