Result of this (a++ + ++a);

[Aftab Ahmed]

Hi,
can anybody tell about this
int a=10;
for(int i=0,i<4,i++)
System.out.println(a++ + ++a);
why v get that ans's
22
26
30
34
thanx
aftab

[Panagiotis Varlagas]

Here is why:
You have a memory location a which holds an int.
A side-effect of both expressions a++ and ++a is that the value of a is incremented.
However, the value of expression a++ is the value a had before increment, whereas the value of ++a is the value it has after increment.
So, in the first example where a is originally 10, we have:
* a++ evaluates to 10, but increments a to 11
* subsequent +a evaluated to 11+1 = 12
In total 10 + 12 = 22
Similar for loops i =1,2,3.
Hope this helps,
Panagiotis.

Originally posted by Aftab Ahmed:
Hi,
can anybody tell about this
int a=10;
for(int i=0,i<4,i++)
System.out.println(a++ + ++a);
why v get that ans's
22
26
30
34
thanx
aftab

[Suresh Selvaraj]

Hi,
Here a++ is Post increment operator and ++a is a preincrement operator.
Question:
int a=10;
for(int i=0,i<4,i++)<br /> System.out.println(a++ + ++a);<br /> 1.In the first iteration, the following things happen.<br /> The original value of "a i.e 10" + "a" gets incremented to "11" , then "++a increments the value of "11" by 1 to 12 and hence you get "22".<br /> So the net result is,<br /> "a" "a++" --> "++a"
A. 10 + [11]--> [11 + 1] = 22
B. 12 + [13]--> [13 + 1] = 26
C. 14 + [15]--> [15 + 1] = 30
D. 16 + [17]--> [17 + 1] = 34
- Suresh Selvaraj

[Nijeesh Balan]

Hi,
There was a posting by Maha.. which clearly explained ++ and -- operations..
I don't remember the link exactly. However I am just presenting u the gist of it.
In your case the calculations are carried on as follows..
10(11)+(12)12 = 22
12(13)+(14)14 = 26..
and so on.. The point here is just replace the ++ operators with incremented values in brackets and add the ones outside the brackets for result..
The rule applies for both a++ or ++a.
With
Nijeesh.