I'm definately not a coder, but this DOES work, from my experience.
Usually all you have to do is put something like this at the beginning of your script (if it's a vector your talking about):

Vector temp; // you must define vectors in Lite-C
vec_zero (temp); // and then zero it out before use

Now you can use it in the function, or action your needing it for. just remember though, if it's a different "temp" then create a new vector for each one:

Vector temp1;
vec_zero (temp1);

etc...