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Program Traces

• To get a printout of the program flow, you can insert trace messages into the beginning and end of every procedure.
• It is also useful to print the input parameters when a procedure is entered and to print return values when a function is exited.

  string int_name(int n)
  {
     cout << "Entering digit_name. n = " << n << "\n";
     ...
     cout << "Exiting digit name. Return value = "
        << s << "\n";
     return s;
  }
  

• To get a proper trace, you must locate each function exit point.
• Sample output for n = 12305.

  Inside int_name. Thousands.
  Entering int_name. n = 12
  Inside int_name. Teens.
  Entering teen_name. n = 12
  Exiting teen_name. Return value = twelve
  Exiting digit_name. Return value = twelve
  Inside int_name. Hundreds.
  Entering digit_name. n = 3
  Exiting digit_name. Return value = three
  Inside int_name. Ones.
  Entering digit_name. n = 5
  Exiting digit_name. Return value = five
  Exiting int_name. Return value = twelve thousand three hundred five
  

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