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POError_handler… what?
 

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    <p>I'm trying to learn some C and have chosen to use the book "SAMS Teach yourself C in 21 days". (<i> btw is there any good C book at all? This is my third! I always end up with bad or broken code that is supposed to work and hit a wall in my learning process when it doesn't! :-( </i> ) Sadly I've run upon the code underneath that I just should type in and run. The typing went well but the running... well, not so well! The compiler gives me an error about this line: </p> <pre><code>{ printf ("Printer busy or disconnected\n"); error_handler; } </code></pre> <p>when I try to run this code. And since I'm VERY MUCH a novice when it comes to C coding, I have NO IDEA at all what to do, when the editor returns an error messages like this:</p> <pre><code>"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .clean-conf rm -f -r build/Debug rm -f dist/Debug/GNU-MacOSX/type_and_run CLEAN SUCCESSFUL (total time: 158ms) "/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf "/usr/bin/make" -f nbproject/Makefile-Debug.mk dist/Debug/GNU-MacOSX/type_and_run mkdir -p build/Debug/GNU-MacOSX rm -f build/Debug/GNU-MacOSX/Type and run 1.o.d gcc -c -g -MMD -MP -MF build/Debug/GNU-MacOSX/Type and run 1.o.d -o build/Debug /GNU-MacOSX/Type\ and\ run\ 1.o Type\ and\ run\ 1.c i686-apple-darwin10-gcc-4.2.1: and: No such file or directory i686-apple-darwin10-gcc-4.2.1: run: No such file or directory i686-apple-darwin10-gcc-4.2.1: 1.o.d: No such file or directory Type and run 1.c: In function 'do_heading': Type and run 1.c:54: error: 'error_handler' undeclared (first use in this function) Type and run 1.c:54: error: (Each undeclared identifier is reported only once Type and run 1.c:54: error: for each function it appears in.) make[2]: *** [build/Debug/GNU-MacOSX/Type and run 1.o] Error 1 make[1]: *** [.build-conf] Error 2 make: *** [.build-impl] Error 2 BUILD FAILED (exit value 2, total time: 158ms) </code></pre> <p>All I can understand is that "error_handler" is undeclared and that it does not seem to be a library function. SIGH!</p> <p><b><br> So said short, is there anything I can do to modify the code so it will work as intended and I can move on? </b> </p> <p>Or should I just throw the book over in the pile of useless books about C?</p> <p>Here is the code in its full length:</p> <pre><code>void do_heading(char *filename); int line = 0, page = 0; int main(int argv, char *argc[]) { char buffer[256]; FILE *fp; if (argv &lt; 2) { fprintf(stderr, "\nProper Usage is: " ); fprintf(stderr, "\n\nprint_it filename.ext\n"); return (1); } if ((fp = fopen(argc[1], "r")) == NULL) { fprintf(stderr, "Error opening file, %s!", argc[1]); return (1); } page = 0; line = 1; do_heading(argc[1]); while( fgets( buffer, 256, fp ) != NULL ) { if( line % 55 == 0 ) do_heading(argc[1]); fprintf( stdout , "%4d:\t%s", line++, buffer ); } fprintf( stdout , "\f" ); fclose(fp); return 0; } void do_heading(char *filename) { page++; if (page &gt; 1) fprintf( stdout , "\f"); fprintf( stdout, "Page: %d, %s\n\n", page, filename); if ((stdout = fopen("PRT:","w")) == NULL) { printf ("Printer busy or disconnected\n"); error_handler; } } </code></pre>
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    1. USninjalj
    1. USKim Merrild
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    1. CO"int argv" and "char *argc[]" ..really?!!!
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      1. USSangeeth Saravanaraj
    2. COThat what the book says! :-S
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    3. COBut none the less the rest of the code okay except this line: { printf ("Printer busy or disconnected\n"); error_handler; }
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