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need help fındıng error

This is a discussion on need help fındıng error within the C Programming forums, part of the General Programming Boards category; Code: #include <stdio.h> #include <stdlib.h> FILE * p; int main() { p=fopen("meryem.txt","a+"); if(fopen("meryem.txt","a+")) { printf("dosya acıldı:"); } else printf("dosya acılamadı:"); ...

  1. #1
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    need help fındıng error

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    FILE * p;
    int main()
    {
    
    
        p=fopen("meryem.txt","a+");
        if(fopen("meryem.txt","a+"))
        {
        printf("dosya acıldı:");
        }
        else
        printf("dosya acılamadı:");
        fclose(p);
    
    
    
    
    }
    it always says p undefined, even though it works on my friends computer.

  2. #2
    Registered User ledow's Avatar
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    p *is* defined, so either your headers are missing or broken (i.e compiler /IDE configuration issues). My compiler doesn't complain about that code at all (though it does complain about you not returning anything from main - stick a return(EXIT_SUCCESS) in at the end of that function).

    P.S. Your text is in UTF-8, so I assume you have a UTF-8 compatible compiler?

    P.P.S. Learn to indent properly.

    - Compiler warnings are like "Bridge Out Ahead" warnings. DON'T just ignore them.
    - A compiler error is something SO stupid that the compiler genuinely can't carry on with its job. A compiler warning is the compiler saying "Well, that's bloody stupid but if you WANT to ignore me..." and carrying on.
    - The best debugging tool in the world is a bunch of printf()'s for everything important around the bits you think might be wrong.

  3. #3
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    i dont have a problem with anything else, i use codeblocks and even though it works on my friends computer it doesnt always work on mine. i dont think the headers are missing or broken..

  4. #4
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    You should copy/paste your compiler error.
    stahta01 likes this.

  5. #5
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    there is some problem with your codeblocks settings not the code

  6. #6
    Registered User ledow's Avatar
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    Quote Originally Posted by zeybek258388 View Post
    i dont have a problem with anything else, i use codeblocks and even though it works on my friends computer it doesnt always work on mine. i dont think the headers are missing or broken..
    Put it this way - a million people would have jumped on your code by now if there was a problem with it (and even I mentioned two completely unrelated things about it). The code is fine. If a FILE isn't defined properly, that's because you didn't #include stdio.h (which you have) or because the compiler can't *find* stdio.h. FILE is pretty much an in-built feature of the C standard library and not likely to be missing from your compiler entirely. You're not looking at something that's staring you in the face - your development environment is bugged. Either you're not heeding warnings/errors that it's throwing at you, or it's not doing what you think it's doing.

    That code compiles perfectly. FILE is well-defined in all C environments so long as you #include stdio.h (which you have). The problem's not the code.

    - Compiler warnings are like "Bridge Out Ahead" warnings. DON'T just ignore them.
    - A compiler error is something SO stupid that the compiler genuinely can't carry on with its job. A compiler warning is the compiler saying "Well, that's bloody stupid but if you WANT to ignore me..." and carrying on.
    - The best debugging tool in the world is a bunch of printf()'s for everything important around the bits you think might be wrong.

  7. #7
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    Quote Originally Posted by zeybek258388 View Post
    i dont have a problem with anything else, i use codeblocks and even though it works on my friends computer it doesnt always work on mine. i dont think the headers are missing or broken..
    FAQ-Compiling (errors) - CodeBlocks

    Tim S.
    "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the universe trying to produce bigger and better idiots. So far, the Universe is winning." Rick Cook

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