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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() {
move();
turnLeft();
move();
turnRight();
}
JavaScript

Row 2, Column 2, Facing North

Row 3, Column 3, Facing East

Row 3, Column 3, Facing West

Row 4, Column 4, Facing East

1 answer

Let's break down what the stairStep function does step-by-step. The function contains the following instructions:

  1. move(); - Move one space forward in the current direction.
  2. turnLeft(); - Turn left 90 degrees from the current direction.
  3. move(); - Move one space forward in the new direction after turning left.
  4. turnRight(); - Turn right 90 degrees from the current direction.

Now, let's analyze how Karel moves when the stairStep function is called.

First Call to stairStep()

  1. Starting position: Row 1, Column 1, Facing East.
  2. move(); - Karel moves to Row 1, Column 2, still facing East.
  3. turnLeft(); - Karel turns left to face North.
  4. move(); - Karel moves to Row 2, Column 2, now facing North.
  5. turnRight(); - Karel turns right to face East.

After the first call:

  • Position: Row 2, Column 2
  • Facing: East

Second Call to stairStep()

  1. Starting position: Row 2, Column 2, Facing East.
  2. move(); - Karel moves to Row 2, Column 3, still facing East.
  3. turnLeft(); - Karel turns left to face North.
  4. move(); - Karel moves to Row 3, Column 3, now facing North.
  5. turnRight(); - Karel turns right to face East.

After the second call:

  • Position: Row 3, Column 3
  • Facing: East

Conclusion

After calling the stairStep function twice, Karel will be at Row 3, Column 3, facing East.

The correct answer is: Row 3, Column 3, Facing East.