18 multiple choice 1 point how can we improve the following program? function main() { move(); move()…

18 multiple choice 1 point how can we improve the following program? function main() { move(); move(); move(); move(); move(); move(); move(); move(); } main(); use a while loop to repeat the move command fix the indentation of this program use a for loop to repeat the move command break down this program into more functions clear my selection 19 multiple choice 1 point which of the following is not a valid condition to go in an if statement for karel? ballspresent() beepersblocked() turnleft() frontisclear() clear my selection 20 multiple choice 1 point what is the purpose of using a for loop in code? to do something while a condition is true to make programs run faster to repeat something a fixed number of times to do something if a condition is true clear my selection 21 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 world that is 10x10 in size) function stairstep() { move(); turnleft(); move(); turnright(); }

18 multiple choice 1 point how can we improve the following program? function main() { move(); move(); move(); move(); move(); move(); move(); move(); } main(); use a while loop to repeat the move command fix the indentation of this program use a for loop to repeat the move command break down this program into more functions clear my selection 19 multiple choice 1 point which of the following is not a valid condition to go in an if statement for karel? ballspresent() beepersblocked() turnleft() frontisclear() clear my selection 20 multiple choice 1 point what is the purpose of using a for loop in code? to do something while a condition is true to make programs run faster to repeat something a fixed number of times to do something if a condition is true clear my selection 21 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 world that is 10x10 in size) function stairstep() { move(); turnleft(); move(); turnright(); }

Answer

Brief Explanations:

  1. The code has multiple repeated move() calls. Using a loop (either while or for) can make the code more concise. A for loop is better when you know the exact number of repetitions, which seems to be the case here.
  2. fromToClear() is not a typical valid condition for an if statement in Karel programming. The others are common sensor - related conditions.
  3. The purpose of a for loop is to repeat something a fixed number of times. A while loop is used to do something while a condition is true.
  4. To have Karel put down 300 tennis balls, since we know the exact number of times the action needs to be repeated, a for loop is the appropriate choice.
  5. Defining a new function is how we can teach Karel new commands. The main function is the entry - point of the program, and loops are for control flow, not for defining new commands.
  6. Analyzing the stairStep function: The first move moves Karel forward, the turnLeft turns it left, the second move moves it up (assuming a grid - based world), and the turnRight turns it back to face East. After calling the function twice, Karel will be at Row 3, Column 1, facing East.

Answer:

  1. C. Use a for loop to repeat the move command
  2. D. fromToClear()
  3. C. To repeat something a fixed number of times
  4. C. For loop
  5. B. Define a new function
  6. Karel will be at Row 3, Column 1, facing East.