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C programming in linux

Posted on 1999-01-22
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Last Modified: 2012-05-04
i have gcc 2.8.0 and am trying to write just a small program that reads data from a file...it looks like this:

#include "/usr/include/stdio.h"
#include "/usr/include/stdlib.h"

int main(void)
{
 FILE *f;
 f = fopen("/tmp/test.tmp","r");


}


well, if i compile with:
gcc filename

the following errors occure:
parse error before *
f undeclared

i think i'm using regular ANSI C...isn't this supposed to work?
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Question by:anders_01
7 Comments
 
LVL 16

Expert Comment

by:imladris
ID: 1258327
The only * I see is the one in the FILE *f line. So I'm guessing that the compiler didn't recognize the FILE as something useful. This, in turn, suggests that the stdio.h was not found or incorrect or something. Check that it is in the specified place (normally one writes: #include <stdio.h> and allows it to be resolved by standard system mechanisms), and that it contains something useful. FILE should be defined as a struct with a bunch of file information in it.

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Expert Comment

by:viktornet
ID: 1258328
you should include the directories in your Options->Directories from the menu in the IDE... The you should do this...

#include <stdio.h>

for opening a file you should do this...

f = fopen("C:\\tmp\\test.tmp","r");

and so on... Hope this help[s....

-Viktor
--Ivanov
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LVL 16

Expert Comment

by:imladris
ID: 1258329
Viktor, I recommended the same thing w.r.t. stdio.h. While that is the normal way of doing it, the full filepath between double quotes is also legal and should work, if the files are there.

It is definitely not true that filepath elements need to be separated by "\\". That is the case in DOS, since DOS decided on the demented paradigm of using a backslash for separating elements. However Unix, and thus Linux, use a forward slash.
This question is specifically in reference to Linux. Please be aware of elements that are DOS specific.

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Author Comment

by:anders_01
ID: 1258330
well, this is linux...so i have to use forward slashes.
my include dirs are correct too...

i read the gcc man page and figured out that
gcc +x c++ file.c -ansi
was a better commad line...


well, someone who knows about a good IDE for linux with inline help and stuff...?? i used to use the Borland IDE for DOS....



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Expert Comment

by:strmtrpr
ID: 1258331
anders 01 try the WPE  it looks just like Borland for dos.
http://www.linuxos.org/Lprogram.html   scroll down this page
a little there are a few other IDEs for linux.
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LVL 7

Accepted Solution

by:
HalldorG earned 20 total points
ID: 1258332

#include "/usr/include/stdio.h"
#include "/usr/include/stdlib.h"

int main(void)
   {  
 FILE * tmp_file;
 char * tmp_filename;
 tmp_filename = "/tmp/file1";
 tmp_file = fopen (tmp_filename, "r");
 }


compile with
gcc filopen.c -o fileopen
0
 

Author Comment

by:anders_01
ID: 1258333
that IDE seems to be one that i was looking for, thanks!
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