Thanks every one I just catch the problem
I use the GDB and it helps me so much
I will share to you some knowledge that I just learn about gdb
a) you must turn on the system core dump ( I use linux )
$ ulimit -c unlimited
b) Then compile your code
c) run it and if you have a segmentation fault it will print a message
"Segmentation fault (core dump)"
(!) NOTE : you must have write permission in this current working
directory to generate this core file
d) to obtain the core file just
$ ls core*
e) try now to make use of gdb ; run it like this
$gdbtui $your_executable_file $core_file
c) you can now debug using those commands
run : to run the program
print $variable: to print a variable value
Sorry for interrupt
