C++ Refresher

Hey guys!

I'm taking my fourth year of programming classes this year. My first year was c++ and then one java and one html/php/java. This year is C++ and I want to refresh my skills. Anyone have any ideas for a program I can challenge myself with to refresh them? I am comfortable with basically anything that's not like a week-long coding challenge, considering all programming is basically alike just different keywords and syntax. Any ideas are greatly appreciated!
The reason to write programs is to make life easier, think of something you could use and write that.

You can always write a bunch of little utilities that do different things, and keep them for your library. Instead of reinventing the wheel next time you can start with one of your utils.

Such as:
Search for a string in a file
search for 2 strings in a file
compare 2 files line by line
display a file with line numbers
write a program that determines how long another program takes to run.
A calculator
A menu
display time
display time in different time zones
display calendar
compare 2 dates
count number of words in a file
count number of lines in a file
create a random number
A function to convert int to string, string to int and so on...
A function that beeps when program finishes
or anything else you think might be useful.
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