CS 101 Notes: 9/9/2010

Basics to Programming:

1.  Get some input 
2.  Do some operations on that input
3.  Provide/Display some results


For step 2., we need to create/determine
some Algorithm.

   Algorithm - a sequence of steps needed to
               solve a problem

Algorithms are normally first expressed in our
   native spoken language.

We need the Algorithm to be expressed in Java.

Stepwise Refinement: is a process that takes parts
    of an Algorithm and re-expresses those parts
    into more detailed steps.


Example:  write a program to solve:

             x = 3y^2 - 5y + 10


Basic Turtle operations


    - forward (distance)   - the turtle moves
                             foward by "distance"
                             pixels 

    - turn (degrees)    - the turtle will turn
                          clockwise by the number of
                          "degrees"


    - penUp ()          - the turtle is to lift up 
                           pen (stop drawing lines)

    - penDown ()        - the turtle is to set down
                           the pen (start drawing 
                            lines)

    - setPenWidth (width) - set the thickness of the
                            line drawn by the pen.

    - setPenColor (Color) - change the color of 
                             line being drawn