[OFFTOPIC]: Problem for hardcore programmers!

[nimdamsk]

Excuse me for offtopic!
Some fellow at my work gave us such a problem:
******************************
Please fix the program below with only one symbol change:
you may add one character
or
you may delete one character
or
you may replace one character

// the program must print 20 stars
main()
{
int i, N = 20;
for(i = 0 ; i < N ; i--)
printf("*");
}

There are three known solutions.
************************

I&#039;ve managed to find only one
Can you help me?

[Bulat Ziganshin]

-i<N
N--

any solution should change either i<N or i-- part, so i&#039;m pretty sure that no more solutions exist

[nimdamsk]

Third is
i + N
Some guy solved this in 8 minutes

[Bulat Ziganshin]

...

[Black_Fox]

Sorry Bulat You were twice slower
Just joking