Problem Set 4

What to Do

1. Submit one of:
   • this version of Filter if feeling less comfortable
   • this version of Filter if feeling more comfortable
2. Submit Recover
3. Submit this form

If you submit both versions of Filter, we’ll record the higher of your two scores.

When to Do It

By 11:59pm on Mon 10/7.

How to Get Help

1. Ask questions on Ed!
2. Sign up for a tutorial!
3. Attend office hours!
4. Email heads@cs50.harvard.edu!

Advice

• Try out any of David’s programs from class via Week 4’s sandboxes.
• If you see any errors when compiling your code with make, focus first on fixing the very first error you see, scrolling up as needed. If unsure what it means, try asking help50 for help. For instance, if trying to compile hello, and

  make filter
  

  is yielding errors, try running

  help50 make filter
  

  instead!