Question: Modify the calculator program from Chapter 7 to make the input stream an explicit parameter (as shown in 8.5.8), rather than simply using cin. Also

Modify the calculator program from Chapter 7 to make the input stream an explicit parameter (as shown in §8.5.8), rather than simply using cin. Also give the Token_stream constructor (§7.8.2) an istream& parameter so that when we figure out how to make our own istreams (e.g., attached to files), we can use the calculator for those. Hint: Don’t try to copy an istream.

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