reading symbolic information ...
[1] stop at 20
[1] stopped in $b1 at line 20
   20   	j = j + i;
$b1, line 20 in "nested.c"
sub(), line 20 in "nested.c"
main(0x1, 0x7fffebe4, 0x7fffebec), line 10 in "nested.c"
1 0 
[3] stop at 24
[3] stopped in sub at line 24
   24   	j = j + i;
sub(), line 24 in "nested.c"
main(0x1, 0x7fffebe4, 0x7fffebec), line 10 in "nested.c"
11 0 
3