// test.c
int main(){
  int a = 0;
  char b[10];
  int c = 0;

  return 0;
}

$ gcc -g -o test test.c

$ gdb -q test
(gdb) break 6                (the return statement)
(gdb) run
(gdb) x &a
0x7fffffffecb8: 0x00000000
(gdb) x b
0x7fffffffecc0: 0x00000001
(gdb) x &c
0x7fffffffecbc: 0x00000000