I am a starting learner. I enter the whole code from a book(headfirst c), as below, but I got "Segmentation fault (core dumped)".
Fedora 17 KDE,
gcc version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC)
I made those files, such as spooky.csv, with the same directory of compiled file. My gcc command is "gcc categorize.c -o categorize"
//categorize.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
char line[80];
FILE *in = fopen("spooky.csv","r");
FILE *file1 = fopen("ufos.csv","w");
FILE *file2 = fopen("disappearances.csv","w");
FILE *file3 = fopen("others.csv","w");
while (fscanf(in,"%79[^\n]\n",line)==1)
{
if (strstr(line,"UFO"))
fprintf(file1,"%s\n",line);
else if (strstr(line,"Disappearance"))
fprintf(file2,"%s\n",line);
else
fprintf(file3,"%s\n",line);
}
fclose(in);
fclose(file1);
fclose(file2);
fclose(file3);
return 0;
}

after that, I thought must something wrong with 'fopen'. I make up another c file.
//test.c
#include<stdio.h>
#include<stdlib.h>

int main()
{
printf("Welcome enter this program1\n");
FILE *file1=fopen("/Home/Documents/cprogram/planA/others.csv","w");
printf("Welcome enter this program2\n");
if(file1!=NULL)
{
printf("3");
fprintf(file1,"%s","Here we are.");
printf("4");
}
else
{
printf("failed open");
return 1;
}
fclose(file1);
return 0;
}
And I got
"Welcome enter this program1
Welcome enter this program2
failed open"
So I thought must be fopen. Could anybody help me out.

fopen sets the variable errno, and you can also use perror to print error message:
http://linux.die.net/man/3/perror

I mean that I want the fopen works.

I mean you need to find the reason, I do not know what is the problem. perror may give some details and will be much easier to fix.
Probably you mistyped the filename, you have no permission to write that file or ???

I got it. Thanks. Let me try first.

Duplicate of http://www.linuxquestions.org/questi...lp-4175425535/ in the programming section.

Please post your thread in only one forum. Posting a single thread in the most relevant forum will make it easier for members to help you and will keep the discussion in one place. This thread is being closed because it is a duplicate of http://www.linuxquestions.org/questi...lp-4175425535/