Variable might not have been initialized ????

Hey experts,
I get this error "Variable userInp might not have been initialized"  to the below code:

                        answer = Calculator(userInp, op1 , op2) + answer.substring(indexR + 1);

does anyone knows why im getting this error ??

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answer and indexR    should have some value before you can get a substring or index the substring.

What's the rest of the code prior to this one?

In Java, all the local variables should be initialized before you can use
try initializing the variable,
if it's a  String:  String userInp = "";
if it's a int: int userInp = 0;
if it's a double: double userInp = 0.0;

hope these helps.. :)

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