Quote: try to avoid functions that modify call-by-reference arguments. They make a program harder to read

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functions that modify call-by-reference arguments can make programs … [Use] 'const' to indicate that the reference is … The absence of 'const' in the declaration of … [p. 126] [Can not use literals, expressions, or data type conversions for non-const reference arguments.]   Google-1   Google-2

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Quote: reference arguments should use 'const' if the argument is not modified; allows literal and expression arguments; improves readability

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