Fun C++ Problem

[whitevandal]

If n is -20, i=0 will never be less than n.
Interestingly, since I didn’t want to read past the first few posts, I did not realize that I played this game five years ago, and accidentally found (again) all three solutions. Again without timing; about 10 minutes, I guess.
Do I get a double bonus?

i is DEcremented, not INcremented. So i will= -1, -2, -3...etc until it passes -20.

[Alterah]

i is DEcremented, not INcremented. So i will= -1, -2, -3...etc until it passes -20.

Right, but if n = -20

Then i < n will fail as 0 < -20 evaluates to false. Thus i will actually just equal 0, and "x" will be printing 0 times.

[tay.stack]

There are four so far... anyone want to see them

for (i=0; i+n; i--)
for (i=0; i<n; n--)
for (i=0;-i<n; i--)
for (i=0;~i<n; i--)

Neat question, not a very good introduction. Once someone finds three, they think they are a genius. Did someone find another?
By the way, the unary NOT is replacing a space (" ") just like the negative symbol

[tay.stack]

My bad, dumb, should've read the posts about the unary operator. Silly oversight, great problem for the class.

[shavarsh]

What's wrong with this one?

for (i=40; i<n; i--)

[Eri523]

What's wrong with this one?

for (i=40; i<n; i--)

This is a character insertion and as such it's against the rules which only allow changing existing characters.

[shavarsh]

I'm not trying to be a smart ***, but this is not insertion?
for (i=0;-i<n; i--)

Or in this case, we substitute default-hidden '+' ?

[Peter_B]

I'm not trying to be a smart ***, but this is not insertion?
for (i=0;-i<n; i--)

The original code has a space character where the minus sign now is - so it is replacing the space.