Problem with compiling program in gcc

BlueSkull · 09-20-2009, 05:50 PM

I compiled the following code:

#include<stdio.h>

#include<string.h>

main()

{

FILE *fi,*fo,*final;

char ch,nch,chf;

char com[100];

int i=0,count=0;

fi = fopen("chk.txt","r");

fo=fopen("two.txt","w");

ch = getc(fi);

while(ch!=EOF)

{

putc(ch,fo);

ch = getc(fi);

}

fi = fopen("chk.txt","r");

ch=getc(fi);

while(ch!=EOF)

{

while((ch>=65&&ch<=90)||(ch>=97||ch<=122))

{

com[i]=ch;

i++;

ch = getc(fi);

}

fo=fopen("two.txt","r");

nch=getc(fo);

i=0;

while(nch!=EOF)

{

if(com[i]==nch)

{

if((i+1)==strlen(com))

{

count++;

i=-1;

}

i++;

nch=getc(fo);

}

else

{

i=0;

nch=getc(fo);

continue;

}

}

final=fopen("output.txt","w");

chf=getc(final);

while(chf!=EOF)

{

chf=getc(final);

}

putc('\n',final);
for(i=0;i<strlen(com);i++)
putc(com[i],final);
putc('\t',final);
putc(count+48,final);
fclose(final);

}

}

but gcc return the error:

/tmp/ccgwEEdW.o.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

I am using Ubuntu 9.04.
pls Help

Thanks in Advance

Aduait

BlueSkull · 09-20-2009, 06:24 PM

/tmp/ccCm7m3y.o

.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

BlueSkull · 09-20-2009, 06:25 PM

/tmp/ccCm7m3y.o

eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

smeezekitty · 09-20-2009, 11:42 PM

use G++ mine did it too but using g++ instead of gcc fixed it

Wim Sturkenboom · 09-21-2009, 03:01 AM

Please put your code between [code] and [/code]. Thanks.

Although smeezekitty's solution will work, your code is not C++ code and therefore I don't see the need to use g++.

Change the extension of your source to '.c' so gcc does not think that it's c++ code. Check man gcc for file extensions and their effects.

I've copied your code into a file xx.c and fixed two warning regarding the return value of main. Next I copied it to xx.cpp so both files are the same.

Code:

wim@btd-techweb01:~/progs$ ls -l xx*
-rw-r--r--  1 wim develop   891 2009-09-21 09:38 xx.c
-rw-r--r--  1 wim develop   891 2009-09-21 09:40 xx.cpp
wim@btd-techweb01:~/progs$ diff xx.c xx.cpp
wim@btd-techweb01:~/progs$ gcc -Wall xx.c -o xx1
wim@btd-techweb01:~/progs$ gcc -Wall xx.cpp -o xx2
xx.cpp: In function `int main()':
xx.cpp:53: warning: comparison between signed and unsigned integer expressions
xx.cpp:98: warning: comparison between signed and unsigned integer expressions
/tmp/ccewiL69.o(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status
wim@btd-techweb01:~/progs$ g++ -Wall xx.cpp -o xx2
xx.cpp: In function `int main()':
xx.cpp:53: warning: comparison between signed and unsigned integer expressions
xx.cpp:98: warning: comparison between signed and unsigned integer expressions
wim@btd-techweb01:~/progs$ ls -l xx*
-rw-r--r--  1 wim develop   891 2009-09-21 09:38 xx.c
-rw-r--r--  1 wim develop   891 2009-09-21 09:40 xx.cpp
-rwxr-xr-x  1 wim develop 12118 2009-09-21 09:53 xx1*
-rwxr-xr-x  1 wim develop 12529 2009-09-21 09:53 xx2*
wim@btd-techweb01:~/progs$

As you can see, I did not have a problem compiling your code using gcc (xx.c). When I compiled xx.cpp with gcc it complained with the error that you have. And using g++ indeed solved that (I was too lazy to fix the 2 warnings).

Please note the extra size required when using C++.

BlueSkull · 09-21-2009, 10:28 AM

Now I m able to compile the file.
I compiled it using g++.

but when i run
./a.out

it gives
Segmentation fault

What sud i do.
pls Help.

Wim Sturkenboom · 09-21-2009, 11:37 AM

Debug

Either learn to use gdb or put some printf's or at strategic places (my approach).

Your problem is probably the strlen(com) as I don't see that com is a NULL terminated string.

Other mistakes that I quickly see
You don't test the value of fi and fo after calls to fopen; so if chk.txt does not exist you will happily continue.
You don't close fi and fo before re-using them.
And I think that there are a couple of other issues regarding the use of getc on a file that you open for writing. Read the man pages of all the functions that you use.

PS What is this code supposed to do?

BlueSkull · 09-21-2009, 11:57 AM

Its Incomplete Code.
Many changes r to be made yet.
I was working on a program to count the frequency of string in a file.

smeezekitty · 09-21-2009, 09:07 PM

i think this:

Code:

if((i+1)==strlen(com))

should be changed to this:

Code:

if(i == (strlen(com)-1))

for better readability
also remember return 0; at the end of main
and main should not be just main() it should be int main() or char main()

smeezekitty · 09-21-2009, 09:10 PM

i just relized something
you didnt close fi and fo
meaning you have a minor resource leak