Don Slaterdslater@andrew.cmu.edu

Wanda Dannwpdann@andrew.cmu.edu

Copyright 2012 Wanda Dann, Don SlaterAll rights reserved

Do in order penguin swagger penguin pushes the bowling ball so it rolls to the pin pin falls over pin responds (stands up and pushes the ball back to penguin) penguin falls over

Algorithm

Initial Scene

Where are we?

Problem Statement

Understand the

problem

Implement the design

Test the code

Design a solution

Implementation is the act of translating an algorithm/storyboard into a computer program.

To Translate Decompose algorithm step by stepIncrementally develop and test

program statements

Step 3: Implement the design Decompose

Problem Statement

Understand the

problem

Implement the design

Test the code

Design a solution

Develop a storyboard / algorithm

Decompose into simple steps

Break an action into simpler steps

12/17/09

Do in order penguin swagger penguin pushes the bowling ball so it rolls to the pin pin falls over pin responds (stands up and pushes the ball back to penguin) penguin falls over

penguin move forwardpenguin roll leftpenguin roll rightpenguin stand up straight

Incremental Development Write code

Write statements (code) – a few steps at a time, not the entire program at once!

Problem Statement

Understand the problem

Implement the design

Test the code

Design a solution

Decompose into simple steps

A statement is created by dragging a code tile into the edit space

Actions useful for setup Same actions and more

Scene Editor Code Editor

Step 5: Test and Revise, if neededProblem Statement

Understand the problem

Revise?

Implement Revise?

Test the code

Design a solutionRevise?

Does it work, no matter what?

Try different values (distance, direction, revs)

When Run… button is clicked◦ Alice builds the scene for the runtime window◦ Executes the program statements, starting with

the myFirstMethod procedure (defined in MyScene)

Runtime window

However…..

Where is the swagger?

Do in order penguin swagger penguin pushes the bowling ball so it rolls to the pin pin falls over pin responds (stands up and pushes the ball back to penguin) penguin falls over

Creating our own procedures

- or -

Teaching a penguin to swagger