Any idea why this is giving me a segmentation fault ?
It prints the first three well and then just gives me a segmentation faultCode:for (j=0;j<=g->n_vertices;j++){ printf("\t\t EDGE %d %d \n",aux2->numerovertice,aux2->a->destino->numerovertice); if(aux2->a->prox->destino!=NULL) { printf("\t\t EDGE %d %d \n",aux2->numerovertice,aux2->a->prox->destino->numerovertice);} aux2=aux2->seg; }
Yes, you compile it with debug
gcc -g prog.c
Then you load the program into a debugger
gdb a.out
Then you run the code and wait for the crash.
Then you do things like
print aux2
print aux2->a
until you find the garbage pointer.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Thanks Salem but how do I run the code ?
Sorry, I've never used gdb before.
Type 'run' into the GDB prompt.Originally Posted by DeanWinchester
Type 'man gdb' for other commands.
Really, you don't say.....
Code:$ gdb GNU gdb (GDB) 7.1-ubuntu Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. (gdb) help List of classes of commands: aliases -- Aliases of other commands breakpoints -- Making program stop at certain points data -- Examining data files -- Specifying and examining files internals -- Maintenance commands obscure -- Obscure features running -- Running the program stack -- Examining the stack status -- Status inquiries support -- Support facilities tracepoints -- Tracing of program execution without stopping the program user-defined -- User-defined commands Type "help" followed by a class name for a list of commands in that class. Type "help all" for the list of all commands. Type "help" followed by command name for full documentation. Type "apropos word" to search for commands related to "word". Command name abbreviations are allowed if unambiguous. (gdb)
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Hmm, thanks a lot, gonna start using this!
My magic 8-ball says it might be this:
But really, that's just a guess.Code:for (j=0;j<=g->n_vertices;j++){
"Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
-Christopher Hitchens
