Hello world error. (compiler/ide problem)

This is a discussion on Hello world error. (compiler/ide problem) within the C Programming forums, part of the General Programming Boards category; Hehe, I'm getting an error on the main saying it must return "int". Code: #include <stdio.h> void main() { printf("Hello ...

  1. #1
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    Hello world error. (compiler/ide problem)

    Hehe, I'm getting an error on the main saying it must return "int".

    Code:
    #include <stdio.h>
    
    void main() 
    {
        printf("Hello world!\n");
    }
    I copied the code straight from a book, so I'm guessing it has something to do with my compiler/IDE. I'm using Dev-C++. Anyone have an idea?

  2. #2
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    change your code to:
    Code:
    #include <stdio.h>
    
    int main(void)
    {
        printf("Hello world\n");
        return 0;;
    }
    Void main is wrong, read the FAQ.

  3. #3
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    Wouldn't have thought it would be in the FAQ. Don't see how a book can be published when the hello world program isn't even right.

  4. #4
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    Hooligan, don't worry, most books uses void main(void), luckly compilers are getting smarter and starting to tell people that the correct is int main(), so from now, just use int main()

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    Thanks for the help

    Well one more question while im still the biggest newbie on the boards. Is there a reason why the command prompt closes almost right after the program runs?

  6. #6
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    Yes hooligan, this happens a lot, you have some options, at the main( ) function, before the 'return 0' statement, use one of the following statements:
    Code:
    getchar();
    system("pause");
    You have a lot more, some of them are platform specific. One example before I leave you
    Code:
    #include <stdio.h>
    
    int main(void)
    {
        printf("hello world\n");
        printf("Press enter to continue...");
        getchar(); //this should 'pause' 
       
        return 0;
    }

  7. #7
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    Seems pretty uneffeciant. I skipped a few pages through my book and tried this program.

    Code:
    #include <stdio.h>
    
    int main(void)
    {
        char me[20];
        
        printf("What is your name?");
        scanf("%s",&me);
        printf("Darn glad to meet you, %s!\n",me);
        getchar();
        getchar();
        
        return 0;
    }
    Had to put two getchar() methods in order for it to not close. I'm guessing I would have ended up needing to put getchar() for each input I had.

  8. #8
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    >>scanf("%s",&me);
    That's not pretty efficient too If you still want to use this, remove the '&' operator, you dont need it here. Also, for getting strings (%s) use the fgets() function, but this is a little advanced for you right now. Anyway, if getchar(); doesn't work, system("pause"); always work, at least for me

  9. #9
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    Get a compile error - " `system' undeclared (first use this function)"

    Got that in the past programs too.

    Code:
    #include <stdio.h>
    
    int main(void)
    {
        printf("%15s","right\n");
        printf("%-15s","left\n");
        system("pause");
    }
    Thanks for all your help though, really helped me get started

  10. #10
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    Of course don't forget to include the 'stdlib.h' header file
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    int main(void)
    {
        printf("%15s","right\n");
        printf("%-15s","left\n");
        system("pause");
    }

  11. #11
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    yes, pause is platform specific, but for me as I told it always work, it works with linux, dos and windows.

  12. #12
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    yes I tried before:
    Code:
    [serruya@programming Desktop]$ uname -a
    Linux programming 2.4.18-3 #1 Thu Apr 18 07:37:53 EDT 2002 i686 unknown
    [serruya@programming Desktop]$ cat file.c
    #include <stdio.h>
    #include <stdlib.h>
    
    int main(void)
    {
            printf("Hello world\n");
            system("pause");
            return 0;
    }[serruya@programming Desktop]$ ./file
    Hello world
    Press any key to continue...Q
    [serruya@programming Desktop]$

  13. #13
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    I'm using College Linux, ohh you really tried in Debian and it didn't work? damn, no more system("pause")'s.

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