6.8 Shape Maker Day 2

TEACHER RESOURCES:

Standards

• • CSTA 2-AP-13: Decompose problems and subproblems into parts to facilitate the design, implementation, and review of programs.

  • CSTA 2-AP-14: Create procedures with parameters to organize code and make it easier to reuse.

CSTA

Unit 6.7 covers Procedures with Parameters.
Students should make sure that Unit 6.7 is done, and that they understand the concepts before exploring today's activities 6.8, which covers lists and input checking.

Concept Recap of 6.7:

• Watch Video(scratch 2)

• Give Students handout on lesson Concepts, or do together as a class

Important concepts are

• Values in Procedure call (Arguments) are passed into the block's input parameters.

• How to access an item from a list. (refresher)

• Repeat Until will loop until the condition is true. (refresher)

Name the shapes that ShapeMaker draws. To do this, students will

1. create a list of shape names;

2. double check user input, using repeat until, so that the user does not enter a value larger than the list length.

Demonstrate or show video of lesson ( scratch2). Students use student site and student handout to complete project.

TEACHER GUIDANCE:

Close-Out (5 minutes)

• 1. Discuss the following questions:

     • What is the advantage of creating a procedure block with an input parameter? eg MakeShape(number of sides)

     • What other possible parameters could MakeShape have? lengthOfSide, shape, color, fill (boolean toogle with 0 = no fill, 1 fill), ....etc.