//Parameter("")
a = undef;
//Parameter("")
b = undef;
d = (10 / 0);
e = (-1 / -0);
f = (d + 1);
g = (e - 1000);
NotANumber = (d / e);
echo("-- comparing undef --");
if((undef == undef)) echo("undef is undef");
if((a == undef)) echo("a is undef");
if((undef == a)) echo("undef is a");
if((a == b)) echo("a is b");
if((c == undef)) echo("c is undef");
if((undef == c)) echo("undef is c");
if(($customSpecialVariable == undef)) echo("$customSpecialVariable is undef");
echo("-- comparing undef --");
if(a) echo("undef evaluates true");
else echo("undef evaluates false");
echo(str("undef evaluates ", (c ? true : false)));
echo("-- echo undef --");
echo(a);
echo(c);
echo("-- calculating with undef --");
echo((a / 1));
echo((a / 0));
echo((1 / a));
echo("-- calculating resulting in +inf --");
echo((1 / 0));
echo((-1 / -0));
echo("-- calculating resulting in -inf --");
echo((1 / -0));
echo((-1 / 0));
echo("-- comparing inf --");
if((d == e)) echo("inf == inf");
else echo("inf != inf");
echo("-- calculating with inf --");
echo(str("inf + 1 is ", f));
echo(str("inf - 1000 is ", g));
echo(str("inf * inf  is ", (d * e)));
echo(str("inf /  -0  is ", (d / -0)));
echo(str("inf / inf  is ", (d / e)));
echo("-- comparing nan --");
if((NotANumber == NotANumber)) echo("nan = nan");
else echo("nan != nan");
echo("-- 3d objects --");
cube(a);
sphere(e);
cylinder(r = (-1 / 0), h = e);
echo("-- for loops --");
for(y = [0 : NotANumber]) echo(y);
for(j = [a : b]) echo(j);
for(i = [(-1 / 0) : (1 / 0)]) echo(i);
