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Karel the Robot Library

Karel Language Reference

Primitives

  • void step() - Moves Karel one intersection forward
  • void turn_left() - Pivots Karel 90 degrees left
  • void pick_beeper() - Takes a beeper from the current intersection and puts it in the beeper bag
  • void put_beeper() - Takes a beeper from the beeper bag and puts it at the current intersection
  • void turn_on(char* path) - Turns Karel on
  • void turn_off() - Turns Karel off

Sensors

  • bool front_is_clear() - Returns true if there is no wall directly in front of Karel. Returns false if there is a wall.
  • bool beepers_present() - Returns true if Karel is standing at an intersection that has a beeper, false otherwise
  • bool facing_north() - Returns true if Karel is facing north, false otherwise
  • bool beepers_in_bag() - Returns true if there is at least one beeper in Karel's beeper bag, false if the beeper bag is empty

Misc

  • void set_step_delay(int) - Sets delay of one Karel's step in miliseconds

Super Karel Language Reference

Super Karel is an extension to the basic Karel the Robot library. Super Karel is "equipped" with additional sensors.

Sensors

  • bool front_is_blocked() - Returns true if there is a wall directly in front of Karel, false otherwise.
  • bool left_is_clear() - Returns true if there is no wall immediately to Karel's left, false if there is
  • bool left_is_blocked() - Returns true if there is a wall immediately to Karel's left, false otherwise
  • bool right_is_clear() - Returns true if there is no wall immediately to Karel's right, false if there is
  • bool right_is_blocked() - Returns true if there is a wall immediately to Karel's right, false otherwise
  • bool no_beepers_present() - Returns true if there is not beeper at the current intersection, false if there is a beeper at the current intersection
  • bool not_facing_north() - Returns true if Karel is not facing north, false if he is facing north
  • bool facing_south() - Returns true if Karel is facing south, false otherwise
  • bool not_facing_south() - Returns true if Karel is not facing south, false if he is facing south
  • bool facing_east() - Returns true if Karel is facing east, false otherwise
  • bool not_facing_east() - Returns true if Karel is not facing east, false if he is facing east
  • bool facing_west() - Returns true if Karel is facing west, false otherwise
  • bool not_facing_west() - Returns true if Karel is not facing west, false if he is facing west
  • bool no_beepers_in_bag() - Returns true if Karel's beeper bag is empty, false if there is at least one beeper in the beeper bag

Library

Here you can find the original library of Karel the Robot, including the library installation instructions.

Karel's World

  • Text file with .kw extension
  • Example of the first line: 7 3 1 2 E 5
    • 7 3 - World dimensions (first horizontal, second vertical)
    • 1 2 - Position of Karel the Robot in the beginning of your program (first horizontal, second vertical)
    • E - Direction of Karel the Robot in the beginning of your program
    • 5 - Number of beepers in Karel's bag in the beginning of your program
  • Any other line starting with B represents beeper(s) placed in the world, example: B 5 1 2
    • B - This is beeper data
    • 5 1 - Position in the world (first horizontal, second vertical)
    • 2 - Number of beepers placed in this position
  • Any other line starting with W represents wall, example: W 5 1 E
    • W - This is wall data
    • 5 1 - Position in the world (first horizontal, second vertical)
    • E - Direction to which the wall is placed from the given position (because walls are placed between particular positions)