can i alter a parameter within a function

[MEENA SELVAM]

If I have a function which takes a parameter A as in
the call f1("found") is it OK if I change the value of
the parameter A within the function as below? 

f1(A) when A /= "not_found" ->
   VId =1,
   if  s_key(VId) /= "not_found" ->
          VId = VId +1,
          f1(A),
   true->
        A = "not_found",
        Vid -1
   end
   
                           


		
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