Chapter 4 exercises assigned, due monday

# Operators
C emphasizes *expressions* rather than statements.

Expressions are built from variables, constants, and operators.

C provides 5 binary arithmetic operator (arithmetic meaning it requires two things to operate on):
- Addition
- Subtraction
- Multiplication
- Division
- Modulus

Unary operators only require *one* thing to operate on. 
- Positive and minus signs