Skill 1 - Making and Modifying Programs

you will learn:

• understand program statements
• send messages to objects
• understand arguments
• using athlete objects
• adding comments

A First Simple Program

• Sending messages
• one statement per line
• athletes
• arguments
• nice and neat comments

Sequence

What did you learn?

Things to remember

When using objects:

• object name, a dot, the function, parentheses: Sal.up()
• use only the functions the objects understand: Sal.down() -> NO NO!
• meaning of values inside parentheses depends on the function: Sal.up(1); Tracer.mark(2); etc.
• objects must be declared before they can be used

Other things:

• computer obeys instructions one after the other