CS 101 Notes: 9/7/2010

Arithmetic operations in JAVA

* multiplication
/ division
+ addition
- subtraction   7 - 5     value1 - value2
- change sign   -6        - 9               - value3
++  increment   ++value4                    value5++
--  decrement   --value4                    value5--

( ) parentheses    8 + 7 * 5    (8 + 7) * 5

% modulus - remainder from an integer division

       8 R 3
    ----
   5| 43

Precedence

1.   ( )
2.   * / %
3.   + - 


Division in depth

   value1 = 43 / 5;

   Since the two operands are both integers,
    We get an integer result (i.e. integer division)

   value2 = 43.0 / 6.0;
   
   In the second example, the two operands are 
    floating point numbers (i.e. there is a decimal
    POINT in the number), we get a floating point
    result (i.e. floating point division)


Basic Types in Java

  int - positive and negative integer values
        ranging from about -2 billion to +2 billion

  float - positive and negative floating point values

  double - positive and negative floating point values
           with more precision than "float"

  boolean - values that are either true or false

  char - a single character that can be typed in
          from a keyboard

  String - a collection/sequence of characters