post increament

public class Q {

public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
System.out.println(i++); // I am loosing it here..if i=0 ; j = i++; that I know that j will be zero, but 4 that I am loosing it
}
}
}

Hi Vuthlarhi
You know the answer already

vuthlarhi donald wrote:// I am loosing it here..if i=0 ; j = i++; that I know that j will be zero, but 4 that I am loosing it

where did j come from?

Just wanted to ilustarte that I know how the post increament works, but I don't get it when we return back to the loop..so you can ignore the comments..

so... do you have an actual question?

the question is I don't understand the output

0,2,4

You're always in the same scope. When you use i++ in the println(), it prints 0 and after that i becomes 1, returning to the beggining of the loop with this value. The for statement will then increment i, which becomes 2, prints 2, and so on.

public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
System.out.println(i++);
}
}
}

iteration 1:
--------------
i value is 0; (0<5 test is pass)
prints 0 then increments i value (i is now 1) //output is: 0
i is incremented in for loop (i is now 2)

iteration 2:
------------
i value is 2; (2<5 test is pass)
prints 2 then increments i value (i is now 3)//output is: 0 2
i is incremented in for loop (i is now 4)

iteration 3:
------------
i value is 4; (4<5 test is pass)
prints 4 then increments i value (i is now 5) //output is: 0 2 4
i is incremented in for loop (i is now 6)

iteration 4:
------------
i value is 6; (6<5 test is fail)

So the final output is: 0 2 4

vuthlarhi donald wrote:the question is I don't understand the output

0,2,4

Its seems you have confused how the for-loop works.. I will explain... see if you too think the same.

int i = 0;

i < 5 (0 < 5: true)
Print 0 //and then increment it to 1 (i++ in Print statement)
i++ (1++ = 2, the one in increment part of for-loop)

i < 5 (2 < 5: true)
print 2 //and then increment it to 3 (i++ in Print statement)
i++ (3++ = 4, the one in increment part of for-loop)

i < 5 (4 < 5: true)
print 4 //and then increment it to 5 (i++ in Print statement)
i++ (5++ = 6, the one in increment part of for-loop)

i < 5 (6 < 5: false)
exit from the for-loop

So the answer is 0 2 4

Hope its clear

Wow!!! Sridhar Gudipalli you are too fast... before i write and submit, your post was already posted..

vuthlarhi donald, you can ignore my post(its same as one with Sridhar Gudipalli)

thank you guys..now I understand it...