Question

1. multiple choice 1 point say you want to write a program to have karel put down 300 tennis balls. which control structure would you use? nested while loop if statement for loop while loop clear my selection 22. multiple choice 1 point how can we teach karel new commands? the main function define a new function while loop for loop clear my selection 23. multiple choice 1 point karel starts at row 1 and column 1, facing east. after calling the stairstep function twice, where will karel be and what direction will karel be facing? (assume this is a superkarel program and the world is 10x10 in size) function stairstep() { turnleft(); move(); turnright(); } row 3, column 3, facing east row 3, column 3, facing west row 4, column 4, facing east row 2, column 2, facing north clear my selection 24. multiple choice 1 point why does a programmer indent their code? a key part of good programming style! helps show the structure of the code easier for other people to understand. all of the above clear my selection 25. multiple choice 1 point in the following code from the chomp karel example, what is the purpose of if statement #2? // this code below has karel walk down the // row and clean up all of the tennis balls // on the way. function main() { while (frontisclear()) { // if statement #1 if (ballpresent()) { takeball(); } move(); // if statement #2 if (ballpresent()) { takeball(); } } } main(); to pick up the ball that is in the last spot, if there is one to take the ball from all of the positions that have a ball on them to pick up the ball from the last spot clear my selection

Explanation:

1. A for - loop is ideal for a fixed number of iterations like putting down 300 tennis balls.
2. New commands in Karel can be defined using a function.
3. Analyzing the stairStep function which moves right, turns left, moves up, and turns right. Starting at (1, 1) facing East, after two calls, Karel will be at Row 3, Column 3 facing East.
4. Indenting code helps show structure and makes it easier for others to understand, so all are correct reasons.
5. The if statement #2 in the code checks if a ball is present at the current spot and takes it if so, which is to pick up the ball that is in the last spot if there is one.

Answer:

1. For loop
2. Define a function
3. Row 3, Column 3, Facing East
4. All of the above
5. To pick up the ball that is in the last spot, if there is one