Learning Karel Programming: Writing the Second Karel Program

Introduction to Karel's World

• Parts of Karel's World
  • Walls: Lines that Karel cannot move through, forming the borders and internal barriers of the grid.
  • Position Reference: Karel's position is identified by rows (streets) and columns (avenues).
  • Example: 5th Street (horizontal), 8th Avenue (vertical).

Understanding Karel's Orientation

• Facing Directions:
  • Karel can face north, east, south, or west.
  • Visualize Karel's direction to understand movement commands.
• Example Commands:
  • Turning Left:
    • Facing east, a turnLeft command makes Karel face north.
    • Facing north, a turnLeft makes Karel face west.

Writing the Second Karel Program

• Program Steps:
  1. Put Down a Ball
  2. Move
  3. Turn Left
  4. Repeat the above steps with additional commands:
     • Put down a ball, move, turn left again.
• Command Example: putBall, move, turnLeft, putBall, move, turnLeft

Key Points

• Spaces in the program are ignored by Karel.
• Execution: Run the program slowly to observe Karel's actions.

Conclusion

• Successfully written a second Karel program.
• Encouragement to write more Karel programs to practice skills.