Question: C++ question: Write a program that reads a C++ source code file and outputs a list of all identifiers (that is, variable names, but not

C++ question:

Write a program that reads a C++ source code file and outputs a list of all identifiers (that is, variable names, but not keywords, that are not found in comments or string constants) in alphabetical order. Each identifier should be output with a list of line numbers on which it occurs.

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