Example of a Complete Robot Program

Write a program to enable Bill to do the following:
Bill is currently positioned on the corner of 2^nd street and 3^rd avenue, facing east. Beepers are placed randomly on corners encompassed by 2^nd and 7^th streets, and 3^rd and 7^th avenues respectively. The area is framed by wall sections between the 7^th and 8^th avenues, and the 2^nd and 3^rd avenues. Bill is required to pick up all the beepers (without performing an error shutoff!!). NOTE: There may be more than one beeper on each street corner.

Figure...

BEGINNING-OF-PROGRAM
	DEFINE_NEW-INSTRUCTION turnright AS
	BEGIN
		ITERATE 3 TIMES
			turnleft;
	END

	DEFINE-NEW-INSTRUCTION position-for-next-two AS
	BEGIN
		turnright;
		move;
		turnright;
	END

	DEFINE-NEW-INSTRUCTION go-to-next-row AS
	BEGIN
		turnleft;
		move;
		turnleft;
	END

	DEFINE-NEW-INSTRUCTION clear-corner-of-beepers AS
	BEGIN
       		 WHILE next-to-beeper DO
               		 pickbeeper;
	END

	DEFINE-NEW-INSTRUCTION pick-beeper-if-present AS
	BEGIN
		IF next-to-beeper
		THEN clear-corner-of-beepers;
	END 

	DEFINE-NEW-INSTRUCTION harvest-a-row AS
	BEGIN
		WHILE front-is-clear DO
		BEGIN
			pick-beeper-if-present;	
			move;	
		END
		pickbeeper-if-present;
	END

	DEFINE-NEW-INSTRUCTION harvest-2-rows AS
	BEGIN
		harvest-a-row;
		go-to-next-row;
		harvest-a-row;
	END

	BEGINNING-OF-EXECUTION
		ITERATE 3 TIMES
		BEGIN
			harvest-2-rows;
			position-for-next-two;
		END
		move;
		turnoff;
	END-OF-EXECUTION
END-OF-PROGRAM		 

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