Quick compiling error..

This is a discussion on Quick compiling error.. within the C Programming forums, part of the General Programming Boards category; I can't seem to find the solution to this error. I'm relatively new to C programming. Code: hw4.c:61:2: warning: no ...

  1. #1
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    Quick compiling error..

    I can't seem to find the solution to this error.

    I'm relatively new to C programming.


    Code:
    hw4.c:61:2: warning: no newline at end of file
    Undefined                       first referenced
     symbol                             in file
    pow                                 /var/tmp//ccN4AJpg.o
    ld: fatal: Symbol referencing errors. No output written to a.out
    collect2: ld returned 1 exit status
    any information is welcome. Thanks

  2. #2
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    Re: Quick compiling error..

    If you compile simply it will this error for only math.h. Because sometimes it may not include in our program.

    So you need to use -lm option to include the math.h header file.

    cc -lm <programname>

    After compiling with this option If you execute that you won't get this error.

    This -l option used to search and link the library files
    Last edited by sganesh; 02-26-2010 at 10:49 PM. Reason: missing some suggestion

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    Thanks. I really appreciate that. Worked great.

    Is there any background as to why that error occurs?

  4. #4
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    Re: Quick compiling error..

    yeah. It may not search or link that math.h header file correctly in out program. For this problem only they have provided the -l option in cc compiler.

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    Thanks for the help. I greatly appreciate it.

  6. #6
    C++まいる!Cをこわせ! Elysia's Avatar
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    A better answer is that you are trying to call a function that does not reside within your executable, but another .dll file elsewhere. The compiler/linker doesn't know where this function lies, and must know this in order to compile your executable.
    So you must tell the linker where to look for this information, and this is what you do by specifying this command line option.

    The first warning is because you don't have a newline at the end of your file. This is required for some reason.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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