No return on char counting program

This is a discussion on No return on char counting program within the C Programming forums, part of the General Programming Boards category; When I execute the following piece of code I'm prompted to typed in some characters, however nothing happens when I ...

  1. #1
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    Feb 2010
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    Question No return on char counting program

    When I execute the following piece of code I'm prompted to typed in some characters, however nothing happens when I press return. Surely a value should be returned indicating how many characters are contained in the input?

    Code:
    #include <stdio.h>
    
    main()
    {
    long nc;
    nc = 0;
    while(getchar() != EOF)
    ++nc;
    printf("%ld\n", nc);
    }

  2. #2
    Registered User jeffcobb's Avatar
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    Ugh, formatting...

    Code:
    #include <stdio.h>
    
    main()
    {
       long nc;
       nc = 0;
       while(getchar() != EOF)
          ++nc;
       printf("%ld\n", nc);
    }
    Thats a little better and isn't the code clearer now too?
    As for your question here is a hint: EOF != '\n' (or maybe '\r' depending on platform)
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

  3. #3
    spurious conceit MK27's Avatar
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    Because pressing return does not indicate EOF.

    Try using:
    Code:
    while(getchar() != '\n')
    instead.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  4. #4
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    Thanks all. One more thing..... when the program is running, how do I escape back to normal terminal node?

  5. #5
    Registered User jeffcobb's Avatar
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    Well, once you escape your while() loop with either CTRL-D (EOF) or ENTER ('\n') it should print the number of characters and exit for you...
    C/C++ Environment: GNU CC/Emacs
    Make system: CMake
    Debuggers: Valgrind/GDB

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