Uh what are you doing there?

var l = .00000012;
var c = .0000000000020;

var-accuracy ends with .001, you should use double variables.

You output the wrong variables (what's a,b?).

Code:
f = 2*pi sqrt(L*c)/1


You have defined PI, not pi.
There is no operator between pi and sqrt.
Again, what is L? (lite-C is case-sensitive).
(Dividing by 1 is not so helpful, but I guess you know that. wink )
There is no semicolon.

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