GCC compile error coz of file pointer

This is a discussion on GCC compile error coz of file pointer within the C Programming forums, part of the General Programming Boards category; I get a compile error when it runs into my file pointer stuff. I am compiling using GCC, and am ...

  1. #1
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    GCC compile error coz of file pointer

    I get a compile error when it runs into my file pointer stuff. I am compiling using GCC, and am compiling .c files.

    Code:
    MAIN.C
    
    #include <stdio.h>
    #include <conio.h>
    #include <stdlib.h>
    
    int main()
    {
        printf("Hi");
        message();
        FILE * Tmp;
        Tmp = fopen("hihello.txt", "a");
        fprintf(Tmp, "Hi\nHello");
        fclose(Tmp);
    }
    Code:
    SUB.C
    
    #include <stdio.h>
    #include <conio.h>
    #include <stdlib.h>
    
    int message()
    {
        printf("\nHello");
    }
    In function main:
    Parse error before *
    Tmp undeclared

    ...that sounds like I'm not using the correct header file?

    Contents of my compile batch file:

    Code:
    @echo off
    cls
    path c:\mingw\bin;c:\windows\command
    gcc -c -g main.c
    gcc -c -g sub.c
    gcc -o pgm main.o sub.o
    The world is waiting. I must leave you now.

  2. #2
    Code Goddess Prelude's Avatar
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    In C all variables must be declared at the beginning of the block. This should work better:
    Code:
    #include <stdio.h>
    #include <conio.h>
    #include <stdlib.h>
    
    int main()
    {
        FILE * Tmp;
        printf("Hi");
        message();
        Tmp = fopen("hihello.txt", "a");
        fprintf(Tmp, "Hi\nHello");
        fclose(Tmp);
    }
    Also, message is defined as returning an int yet you don't actually return anything. And be sure to check Tmp so that you can be sure fopen didn't fail.

    -Prelude
    My best code is written with the delete key.

  3. #3
    and the hat of wrongness Salem's Avatar
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    printf("Hi");
    message();
    FILE * Tmp;
    This is C++ code - declarations anywhere


    FILE * Tmp;
    printf("Hi");
    message();
    This is C code, declarations at the start

  4. #4
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    thanks

    Thank you Salem and Prelude.

    Prelude:
    Also, message is defined as returning an int yet you don't actually return anything.
    Returing something, with just a simple fprint call?

    And be sure to check Tmp so that you can be sure fopen didn't fail.
    Isn't that what append is for? If it doesn't exist, create it.
    The world is waiting. I must leave you now.

  5. #5
    Code Goddess Prelude's Avatar
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    >Returing something, with just a simple fprint call?
    Exactly, either declare the function as void or return the return value of printf.

    >Isn't that what append is for? If it doesn't exist, create it.
    The file is created if possible, but you can't assume that it will be.

    -Prelude
    My best code is written with the delete key.

  6. #6
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    I compiled and ran my program. ( Upon adding on a small piece of code ). It executes fine, but upon completion, Windows says, "This program has performed an illegal option". I have 2 sub source files, one is on my previous post, the other I don't have posted yet is pretty much the same. I return 0 in both of these functions, re-compile, and the program exexcutes fine, and doesn't cause any errors upon termination.
    The world is waiting. I must leave you now.

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