Script started on Tue Apr 13 13:45:44 1999
cs102@fac44 [51] : g++ -g error.C

cs102@fac44 [52] : a.out

Segmentation fault
cs102@fac44 [53] : cat error.C

#include <iostream.h>

struct SomeInts {
    int i1;
    int i2;
    int i3;
};

void Die()
{
    int a[100];
    int i;

        i = 0;
        for (i=0; i >= 0; i++) 
            a[i] = i;
}

main()
{
    int i = 7;
    SomeInts *ptr = new SomeInts;

        ptr->i1 = 10;
        ptr->i2 = 9;
        ptr->i3 = 8;

        i = 7;
        Die();
}
cs102@fac44 [54] : gdb a.out

GDB is free software and you are welcome to distribute copies of it
 under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.16 (sparc-sun-solaris2.6), 
Copyright 1996 Free Software Foundation, Inc...
(gdb) run
Starting program: /home/cs102/public_html/Brad/Examples/a.out 
warning: Unable to find dynamic linker breakpoint function.
warning: GDB will be unable to debug shared library initializers
warning: and track explicitly loaded dynamic code.

Program received signal SIGSEGV, Segmentation fault.
0x1059c in Die () at error.C:16
16                  a[i] = i;
(gdb) where
#0  0x1059c in Die () at error.C:16
#1  0x10610 in main () at error.C:29
#2  0x104ec in _start ()
Cannot access memory at address 0xcc.
(gdb) list
11          int a[100];
12          int i;
13      
14              i = 0;
15              for (i=0; i >= 0; i++) 
16                  a[i] = i;
17      }
18      
19      main()
20      {
(gdb) print i
$1 = 722
(gdb) print a
$2 = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 
  20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 
  39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 
  58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 
  77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 
  96, 97, 98, 99}
(gdb) where
#0  0x1059c in Die () at error.C:16
#1  0x10610 in main () at error.C:29
#2  0x104ec in _start ()
#3  0x9d in ?? ()
Cannot access memory at address 0xd0.
(gdb) up
#1  0x10610 in main () at error.C:29
29              Die();
(gdb) list
24              ptr->i1 = 10;
25              ptr->i2 = 9;
26              ptr->i3 = 8;
27      
28              i = 7;
29              Die();
30      }
(gdb) print i
$3 = 129
(gdb) print ptr
$4 = (SomeInts *) 0x80
(gdb) quit
The program is running.  Quit anyway (and kill it)? (y or n) y
cs102@fac44 [55] : gdb a.out

GDB is free software and you are welcome to distribute copies of it
 under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.16 (sparc-sun-solaris2.6), 
Copyright 1996 Free Software Foundation, Inc...
(gdb) bra eak Die
Breakpoint 1 at 0x10564: file error.C, line 14.
(gdb) break error.C:14
Note: breakpoint 1 also set at pc 0x10564.
Breakpoint 2 at 0x10564: file error.C, line 14.
(gdb) break error.C:28
Breakpoint 3 at 0x10600: file error.C, line 28.
(gdb) run
Starting program: /home/cs102/public_html/Brad/Examples/a.out 
warning: Unable to find dynamic linker breakpoint function.
warning: GDB will be unable to debug shared library initializers
warning: and track explicitly loaded dynamic code.

Breakpoint 3, main () at error.C:28
28              i = 7;
(gdb) list
23      
24              ptr->i1 = 10;
25              ptr->i2 = 9;
26              ptr->i3 = 8;
27      
28              i = 7;
29              Die();
30      }
(gdb) print ptr
$1 = (SomeInts *) 0x208c8
(gdb) print *ptr
$2 = {i1 = 10, i2 = 9, i3 = 8}
(gdb) next
29              Die();
(gdb) next

Breakpoint 1, Die () at error.C:14
14              i = 0;
(gdb) list
9       void Die()
10      {
11          int a[100];
12          int i;
13      
14              i = 0;
15              for (i=0; i >= 0; i++) 
16                  a[i] = i;
17      }
18      
(gdb) next
15              for (i=0; i >= 0; i++) 
(gdb) next
16                  a[i] = i;
(gdb) next

Program received signal SIGSEGV, Segmentation fault.
0x1059c in Die () at error.C:16
16                  a[i] = i;
(gdb) quit
The program is running.  Quit anyway (and kill it)? (y or n) y
cs102@fac44 [56] : exit

exit

script done on Tue Apr 13 14:02:51 1999