* EXPRESSIONS AND OPERATORS
** OBJECTIVES
*** OPERANDS
- the digits or letters that is in the expression
*** OPERATORS
- it is the signs and symbols
- special symbols to manipulate the operands

***** ARITHMETIC
- (+, -, /, *, %)

***** ASSIGNMENT OPERATORS
- are used for assigning values to  a variable
-  "=" = signs the value of the right operand to the left
- "+=" = adds the value of the right operand to the left of the operand
- "-=" = subtracts the value of the right operand from the left operand
         and assigns a new value
- "*=" = multiply the value of the right operand from the left operand
         and assigns a new value
- "/=" = Divides the value of the left operand by the value of the left
         operand and assigns a new value to the left operand
- "%=" = Divides the value of the left operand by the value of the left
         operand and assigns the remainder to the left operand
  
***** STRING OPERATOR
- there is only one operator
- it adds two variable (shit + head = sh*thead), or (2 + 7 = 27)
   
*** EXPRESSIONS
- vailid set of values, variables and operators
- evaluates to a single value
**** TYPES OF EXPRESSIONS
***** ARITHMETIC
- arithmetic operators are used to perform mathematical
  calculations, such as addition
***** STRING
- there is only 1 symbol, either addition or subtraction symbol
- it is always enclosed with a quotation mark ("")
***** BOOLEAN
- answers you with a right or wrong answer