Complete these notes from the Code structures video
What are the 4 kinds of code structures?
| Ask Questions | Repeat Code |
|---|---|
|
Describe the pre and post conditions for the Cleanup program.
pre:
post:
Why is a while loop used for this program?
Why is an extra if statement needed after the while loop?
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How can you change this program to work if there are an unknown number of balls in each stack?
Did you consider the edge cases?
// This program has karel walk down the
// row and clean up all of the tennis balls
// on the way.
function start(){
while(frontIsClear()){
if(ballsPresent()){
takeBall();
}
move();
}
if(ballsPresent()){
takeBall();
}
}