+,-,*,/

Example15:
# using some arithmetic in expressions

forward(2+3)
if(3*4 < 13){
    x = 3
    left(x-2)
}
backward(-(3+4)/2)

x = ...

Example16:
# store a number
x = 42

# store another number, based on x
y = x / 2

# store a logical expression
clear = leftIsClear & frontIsClear & rightIsClear

# store the actual number of steps taken
# until you bumped (returned by "forward")
actual = forward(100)

if(clear){
     right(2)
     forward(actual) # go back
}
left(y)

End

Example17:
# stop after 5 steps, or earlier when you encounter a beacon on the right
repeat(5)
{
	forward(1)
	if(rightIsBeacon)
	{
		end # stops execution of the program
	}
}
# normal end of the program

# Go to the start of the line

right
forward(8)


# Keep on track step by step

repeat
{
    if(frontIsWhite){
        forward(1)
    }
    else if(rightIsWhite){
        right
    }
    else if(leftIsWhite){
        left
    }
    else if(frontIsObstacle){
        end
    }

right
forward(8)

    if(frontIsWhite){
        forward(1)
    }

   else if(rightIsWhite){
        right
    }

  else if(leftIsWhite){
        left
    }

else if(frontIsObstacle){
        end
    }

# Go to the start of the line

right
forward(8)


# Start tracking

follow


# Recursive definition for tracking
procedure follow{
    if(frontIsWhite){
        forward(1)
        follow
    }
    else if(rightIsWhite){
        right
        follow
    }
    else if(leftIsWhite){
        left
        follow
    }
    else if(frontIsObstacle){
        # Finish the current procedure call
        # (because there is nothing to after 
        # this return, all calls will be finished
        # and the program stops)
        return
    }
}

# Pass beacons script
# map: passBeacons.map

right
repeatWhile(frontIsClear){
    forward(1)
}

repeatWhile(frontIsBeacon){
    pickUp
    turn
    putDown
    turn
    forward(1)
}

forward(2)

procedure turn{
    right
    right
}