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Read the API doc for the Scanner class to find a method that reads a String.
Java Platform SE 7

Did you change the code to read the arithmetic operators as Strings and not as numbers?

if (unit = +) {
Two things wrong with the syntax here:
= is the assignment operator, == is for testing equality
+ is the addition operator. If you wanted a String, enclose it in "s like this: "+"...

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