A simple "if" statement takes this form:
if (<expression>) <statement>
or it can have the slightly more complex "if... else..." form:
if (<expression>) <statement> else <statement>
In this case the expression will be evaluated, and if the (rounded)
value is < = 0 (false) the statement after else is
executed, otherwise (true) the other statement is
executed. It is a good habit to always put curly brackets around
the statements in the if", and take a new line in the block for
each statement, so the end code will have this form:
if (<expression>)
{
<statement>
...
<statement>
}
else
{
<statement>
}
As a small example, consider the following code which will move the
instance towards the position x=200 in the room:
if (x < 200)
{
x += 4;
}
else
{
x -= 4;
}