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way I have of driving off the spleen, and regulating the circulation
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When we execute the program, the output generated is the following:
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[ 0 ]
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No characters are displayed and the program believes the text file is empty Obviously, that's incorrect We've somehow misunderstood something fundamental Rather than fretting, or becoming unduly discouraged, the thing to do now is think The problem is that the file is opened in append mode and is therefore positioned at its end When
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inOutget( ch )
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is executed, end-of-file is encountered and the while loop terminates, leaving cnt with a value of 0 While the result of the program is a serious foul-up, the solution is quite trivial once we understand the problem All we need to do is reposition the file back to the beginning before we begin to read The statement
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inOutseekg( 0 );
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accomplishes just that The program is recompiled and rerun This time, the following output is generated:
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Call me Ishmael [ 45 ]
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Some years ago, never mind
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The display and byte count are generated for only the first line of the text file The remaining six lines are ignored Gosh, who ever said that programming is easy This is part of what it means to be a programmer, particularly when we are learning something new (Sometimes it is useful to keep a record of the things we misunderstand or do wrong particularly later when we become impatient with those less experienced than ourselves) At this point we need to take a deep breath and think about what it is we are trying to do versus what we apparently are doing Can you see the problem The problem is that the file is opened in append mode The first time cnt is written, the file becomes repositioned at its end The subsequent get() encounters end-of-file and once more terminates the while loop prematurely The solution this time is to reposition the file to where it was prior to the writing of cnt This can be accomplished with the following two additional statements:
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// mark current position ios_base::pos_type mark = inOuttellg(); inOut cnt sp; inOutseekg( mark ); // restore position
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (993 / 1065) [2001-3-29 11:32:15]
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When the program is recompiled and executed, the output to the terminal is correct Examining the output file, however, we discover it is still not quite right: The final byte count, although being written to the terminal, is not being written to the file The output operator following the while loop is not being executed The problem this time is that inOut is in the "state" of having encountered end-of-file As long as inOut remains in this state, input and output operations are not performed The solution is to clear() the state of the file This is accomplished with the following statement:
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inOutclear(); // zero out state flags
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The complete program looks as follows:
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#include <iostream> #include <fstream> int main() { fstream inOut( "copyout", ios_base::in|ios_base::app ); int cnt=0; char ch; inOutseekg(0); while ( inOutget( ch ) ) { coutput( ch ); cnt++; if ( ch == '\n' ) { // mark current position ios_base::pos_type mark = inOuttellg(); inOut cnt ' '; inOutseekg( mark ); // restore position } } inOutclear(); inOut cnt endl; cout "[ " cnt " ]\n"; return 0; }
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When the program is recompiled and executed, it generates the expected output at last! One of our mistakes in implementing the program was in not providing an explicit statement of the behavior that it needed to support Each subsequent solution was a response to a problem that manifested itself rather than an analysis of the entire problem that required solution We got to the same end as we would have with more thought up front, but with considerable more pain and expense of energy Exercise 2012 Using the output operation defined for the Date class of Exercise 2010 or the CheckoutRecord class of Exercise 2011 (both in
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (994 / 1065) [2001-3-29 11:32:15]