## Lab#4: Arithmetic Expressions and more on C++ I/O

In this lab, we expect you to learn how to form correct expressions
and evaluate expressions with correct precedence. Formatting C++ output
is very useful sometimes. C++ input stream is important to learn.

Here is a list showing what you need to learn:
- Form and evaluate arithmetic expressions correctly in C++
- Learn I/O manipulators to be able to format C++ output
- Practice on using C++ input streams for different applications