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increasing and decreasing in loop

 
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I want someone to explain when to use ++x, --x, ++y, --y in for loop with examples and codes.

Secondly, look at this code :

class Uber{
static int y = 2;
Uber(int x) {this(); y = y*2;}
Uber() {y++; }
}
class Minor extends Uber{
Minor() {super(y); y = y+3; }
public static void main (String[] args) {
new Minor();
System.out.println(y);
}}
The answer given in the book of Kathy and Bert is 9.But, i think the answer should be 7. Because,y = 2 and y*2 is 4. With increment of 3 plus 4 i.e y+3(3+4) =7
 
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Originally posted by Lao Kinsuyi:
...The answer given in the book of Kathy and Bert is 9.But, i think the answer should be 7. Because,y = 2...


But the first line of Uber(int) is this(), which calls Uber() to increment y to 3.

Try adding println statements to see what's happening...
 
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