Programming Clara Chapter 1

Clara's Commands

• Clara can perform the following commands: move(), turnRight(), putLeaf(), and removeLeaf()
  • move(): Clara moves one step forward in the direction she is currently facing
  • turnRight(): Clara turns 90 degrees to the right
  • putLeaf(): Clara puts one leaf at her current position
  • removeLeaf(): Clara removes a leaf at her current position

New Commands

• Clara has gained new skills and commands, including:
  • turnLeft(): Clara turns 90 degrees to the left
  • treeFront(): Clara checks if there is a tree one cell in front
  • treeRight(): Clara checks if there is a tree on her right
  • onLeaf(): Clara checks if there is a leaf at her current position
  • mushroomFront(): Clara checks if there is a mushroom one cell in front
  • stop():Terminate the execution of the program

Flow of Control and Sensors

• The turnLeft() command has the same functionality as the corresponding method created in Chapter 1
• The four new commands (treeFront(), treeRight(), onLeaf(), and mushroomFront()) are sensors that do not change the state of Clara's World, but help sense some aspects of this state
• These sensor commands return a value in the form of true or false in relation to a particular aspect of Clara's World

The Difference between act() and run()

• Code written inside the run() method is executed once and then the program terminates
• Code written inside the act() method will be executed repeatedly
• The stop() command only works inside the act() method and will not work inside the run() method