Variables in a Program(A,B)

[matalog]

I have this program:

Code:

EXPORT FT2M(A,B)
BEGIN
 INPUT(A,"FT","FT",0,0,0);
 INPUT(B,"IN","IN",0,0,0);
 C:=A/3.28084;
 D:=B/39.3701;
 E:=C+D;
 //STRING (A);
 //STRING (B);
 RETURN E;
END;

What purpose do the variables in the name FT2M(A,B) serve?

They do not seem to do anything apart from require the program to be called with:

FT2M(A,B) or FT2M(2,4) e.g. Instead of just FT2M, which can be the case if I simply call the program FT2M().

Even when I enter numbers there, they have no reflection on the outcome of the program.