Chapter 17: File Processing

1. cerr - standard error device
2. 17.3 fig17_03.cpp - Creating a Sequential File
   • L.12 ios::out can be omitted, because this is the default mode of ofstream.
3. 17.4 Reading Data from a Sequential File
   • fig17_06.cpp - Reading and printing a sequential file
     • L.18 When trying to read a non-existing file, or when there is no reading permission, inClientFile.fail() is true. !inClientFile is true.
     • L.29 cout << fixed < < showpoint;
   • fig17_07.cpp - Credit inquiry program
     • L.65 clear() - so you need not close() and open() a file again.
     • L.66 seekg( 0 ) - reposition to beginning of file
4. 17.7 Creating a Random-Access File
   • ClientData.h - ClientData class header
   • ClientData.cpp
   • fig17_11.cpp - Creating a random-access file with 100 blank records sequentially.
5. 17.8 Writing Data Randomly to a Random-Access File
   • ClientData.h - Same as the previous one
   • ClientData.cpp - Same as the previous one
   • fig17_12.cpp - Writing to a random-access file
6. 17.9 Reading from a Random-Access File Sequentially
   • ClientData.h - Same as the previous one
   • ClientData.cpp - Same as the previous one
   • fig17_13.cpp - Reading a random-access file sequentially
     • L.34 You only need to check either "inCredit" or "!inCredit.eof()".
7. 17.10 Case Study: A Transaction-Processing Program
   • ClientData.h - Same as the previous one
   • ClientData.cpp - Same as the previous one
   • fig17_14.cpp - Bank account program
     • L.97 若之前執行過其他動作, get file-position pointer 會跑去別處, 故這裡要 seekg(0).