Types-
   double- 3.75 a number with a decimal does not have to have a number after the decimal 
   integer- whole number 
Declaration- when you declare something you need the type and name
symbol table- a reference for symbols 
Assign- a = b + c
  b + c is an expression 

All mean the same thing-
n=n+1, ++n, n++, n+=1

C----javac Main.java
C----java Main