In this lab, you will learn debugging tools such as assert, gdb, and C++ library debugging flag.

For a basic introduction to GDB, please take a look at this youtube video and man page.

1. Download bad.cc.
2. Compile it: g++ -o test bad.cc
3. Execute it, and observe the segmentation fault.
4. Looking at the code, try to figure out what causes the segv fault.
5. Recompile the code: g++ -o test -D_GLIBCXX_DEBUG bad.cc
6. Excute test and observe a bit helpful message than segmentation fault.
7. Fix the error that causes the segmentation fault.
8. Compile and run to see the assert failure.
9. Recompile the code: g++ -o test -DNDEBUG bad.cc
10. Observe that the assertion failure disappeared.
11. Now, let's debug the code with gdb.
12. Compile the code with debugging option enabled: g++ -o test -ggdb bad.cc
13. Run the debugger: gdb ./test
14. Set a breakpoint at the assertion: b 14
15. Run the program: r
16. Print the filename: p filename
17. Find out why the filename contains that valie and fix it.
18. Be familar with other debugging commands such as next (n), step (s), and continue (c): man gdb
19. Fix the last bug in the code to print out the following outputs.
    The 3rd character is c
    search cs.colostate.edu colostate.edu
20. Before submitting your work, try the graphical interface for GDB: ddd ./test
21. Submit your bad.cc: ~cs253/bin/checkin L3R# bad.cc

Grading:

Note: Please use the exact name given.