Give the third parameter of make_plural (§ 6.3.2, p. 224) a default argument of ‘s’. Test your program by printing singular and plural versions of the words success and failure.
§ 6.3.2, p. 224
Exercise 6.30
Compile the version of str_subrange as presented on page 223 to see what your compiler does with the indicated errors.
Exercise 6.31
When is it valid to return a reference? A reference to const?
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