Choices:
  1. converting ctor and search test
  2. copy test
  3. refresh and toUpper test
  4. instance count test
  5. join test
  6. binary operator+ test
  7. operator= test
  8. operator() test
  9. operator[] test
  10. operator+= test
  11. operator++ test
  12. All tests
Enter choice --> 
Converting constructors and search tests:
found "+" in C++
found 'C' in C++
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Copy constructor tests:
made 2 good copies
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Refresh and toUpper tests:
   str before refresh: C
   str after refresh: c++
   language after chaining: C++
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Instance counter tests:
(Note: initial count now corresponds to number of choices,
 because main created an array of Strings for test names.)
  initial count: 11
  count after a, b: 13
  count after new c: 14
  count after delete c: 13
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3 string objects after joining them:
This is a test of concatenation
This is a test of concatenation
This is a test of concatenation
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3 string objects after + operations:
This is a test of concatenation (using the + operator)
This is a test of concatenation (using the + operator)
This is a test of concatenation (using the + operator)
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Assignment test:
   str1: C++
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Function call operator test (answers should be 2, 1, 2, 1, 0):
  answer 1: 2
  answer 2: 1
  answer 3: 2
  answer 4: 1
  answer 5: 0
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Subscript tests:
"Mutable string" changed to: "Autable string"
"Mutable string" changed to: "Cutable string"
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2 string objects after += operations:
This is a test of compound assignment (using += operator)
This is a test of compound assignment (using += operator)
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Increment tests:
  str1 to start: ABC
  str1 after pre-increment: BCD
  str2: BCD
  str1 after post-increment: CDE
  str3: BCD
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