CODEWITHSUNDEEP
javatrace
Hades
Hades

Reputation: 11

I have some questions regarding this tracing

public class Task {
  public static void main(String args[]) {

    int x = 0, p = 0, sum = 0;

    p = 1;
    x = 2;
    double q;
    sum = 0;
    while (p < 12) {
      q = x + p - (sum + 5 / 3) / 3.0 % 2;
      sum = sum + (x++) + (int) q;
      System.out.println(sum);
      if (x > 5)
        p += 4 / 2;
      else
        p += 3 % 1;
    }
    sum = sum + p;
    System.out.println(sum);
  }
}

While proceeding to line 12 (sum = sum + (x++) + (int)q;) i thought sum should be 5 but actually the output is 4. I tried line 12 in the interactions pane and indeed saw that sum=4. I don't get it. Shouldn't x++ yield 3 (x=2) and if this gets added to (int) q ( double q gave me sth like 2.666666), i should be getting 5. Can someone explain to me what happened?

Additionally,after getting my first output, how should I proceed? The next condition is:

if (x > 5)
  p += 4 / 2;
else
  p += 3 % 1;

since x<5, i should go for the else condition, right? My last question is that, after using p += 3%1, my p still remains 1, so do i return back to this loop (since p<12) or do I get out of this loop and proceed to line19? I'm not sure what to do.

Upvotes: 0

Views: 69

Answers (2)

VinhNT
VinhNT

Reputation: 1101

At your first time, 3%1=0 p +=3%1 => p+=0 thats why p still remains 1

Upvotes: 0

Alexey
Alexey

Reputation: 1226

In line 12 you are using post increment (x++). You should use pre increment ++x.

Post increment puts the current value of x in your statement, then increases x.

Pre increment initially increases x and after that puts result into your statement.

Upvotes: 1

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