May 2002
Beginner
320 pages
6h 18m
English
Content preview from SAMS Teach Yourself C++ in 10 Minutes SECOND EDITION
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Replaying the Tape to Restore State
The GetOperator() and GetOperand() functions in main.cpp can first get input from the saved tape. When that runs out, they can then get input from cin instead. Listing 16.2 shows how this works.
Listing 16.2. main.cpp Reading the Tape from a File
1: #include <iostream> 2: #include <ios> 3: #include <fstream> 4: 5: #include "PromptModule.h" 6: #include "ErrorHandlingModule.h" 7: #include "AccumulatorModule.h" 8: #include "TapeModule.h" 9: #include "ExternalInterfaceModule.h" 10: 11: using namespace std; 12: *13: ifstream TapeInputStream; // Global variable for callback 14: 15: char GetOperator(void) 16: { 17: char Operator; 18: 19: if 20: ( *21: TapeInputStream.is_open() && *22: (!TapeInputStream.eof()) 23: ... |
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.