ddd doesn't see my source files....

Hi all... I am not able to use ddd on my fc5 machine...

when I open a simple test program with gdb I am able to run list main....
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...Using host 
libthread_db library "/lib/libthread_db.so.1".

(gdb) list main
1
2       #include<stdio.h>
3
4       int main(){
5       printf("Hello World!\n");
6       }
(gdb)


but when I open it using ddd, first of all the source code doesn't open 
in a window automatically, and when I try manually... I get and error... 
when I try to run list main through ddd console.. I get the following 
error...
GNU DDD 3.3.11 (i386-redhat-linux-gnu), by Dorothea LUsing host 
libthread_db library "/lib/libthread_db.so.1".
(gdb) list
6       }
(gdb) list main
Line 4 of "test.c" starts at address 0x8048384 <main> and ends at 
0x8048395 <main+17>.
(gdb) list
4       int main(){
5       printf("Hello World!\n");
6       }
(gdb) list main
Line 4 of "test.c" starts at address 0x8048384 <main> and ends at 
0x8048395 <main+17>.
(gdb) list
4       int main(){
5       printf("Hello World!\n");
6       }
(gdb)


Can anyone suggest how I should go about fixing this?