Learning Outcome

At the end of this lesson, you will be able to:

• make a flowchart
• use and understand what a constant is

Movie Watching

• watch "Play Value, The Fall of Atari"

Review

• review getting input from the user

Lesson

• go over "Constants"
  • in python, you can actually change the value, but it is a BAD IDEA
    • they are actually called “constant variables”, I know very odd!
  • most languages will not let you change a value of a constant
    • ex. Swift: let spriteImage = 14
• go over "Flow-charts", Chapter 2
  • Computer Based Problem Solving
• go over "Constants", Chapter 2
  • Computer Based Problem Solving
• work through "Circumference" program to create:
  • top-down design
  • flow-chart

Activity

• do Top-Down Design, Flow-chart and test cases for the problem below
• use the Grafio 3 app
• show how to do circumference of a circle using τ (tau)
  • it is even implemented in Python!
  • C = τr, τ ~= 6.28

Daily Assignment

• make your own "Circumference" program (let a user enter in the radius of a circle and then show them the circumference)
  • do the Top-down and Flow-chart BEFORE coding
• ensure you declare constants correctly
  • PI = 3.14;
  • GOODS_AND_SERVICES_TAX = 0.06;
• ensure they go above variables

Extra

• use a constant in a second language
  • in many languages, once you declare a constant you actually can never change it

Code Links

• Circumference

Homework!

• read "Pseudo-code", Chapter 2
  • Computer Based Problem Solving