- arithmetic expression
  - expression involving numerical values
  - consists of arithmetic operators and operands
- arithmetic operator: designates numerical computation
- division
  - both operands are ints
    - fractional part is truncated
    - "integer division"
  - one operand is real; result is real
- modulo
  - remainder of division
  - can use on reals
  - typically only used on ints
- operand
  - what the operator operates on
  - constant, variable, method call, arithmetic expression
- binary operator: operates on 2 operands
- unary operator: operates on 1 operand
  - e.g. negation "-"
- subexpression: nested expression
- precedence rules
  - determine order of evaluation
  - two or more operators
- if operands of same type, result will have that type, too
- type casting: convert one data type to another
  - implicit
    - numeric promotion
      - operand converted from lower to high precision
      - applied to operands of arithmetic expr
    - assignment conversion
      - occurs when var & val in assignment statement have mismatching types
      - only if var has higher precision
  - explicit
    - type cast operator
      - syntax: (<data type>) <expression>
      - unary operator
      - precedence > binary 
- assignment operator
  - lowest precedence
  - evaluated right to left
  
Quick Check:
1. a. 3
   b. 9 + 1 = 10
   c. 3 + 0 + -8 = -5
   d. 2 * 1 * 2 = 4
2. a. int
   b. float
   c. float
3. b