SLogo Basic Commands

SUM num1 num2

returns sum of num1 and num2

DIFFERENCE num1 num2

returns difference of num1 and num2

PRODUCT num1 num2

returns product of num1 and num2

QUOTIENT num1 num2

returns integer quotient of num1 and num2

REMAINDER num1 num2

returns integer remainder on dividing num1 by num2. The result is the same sign as num2

MINUS num

returns negative of num

FORWARD dist
FD dist

moves the turtle forward by dist pixels

BACK dist
BK dist

moves the turtle backwards by the amount specified

LEFT degrees
LT degrees

turns the turtle counterclockwise by the specified angle

RIGHT degrees
RT degrees

turns the turtle clockwise by the specified angle

SETXY xcor ycor

moves the turtle to an absolute screen position.

SETX xcor

moves the turtle horizontally to a new absolute horizontal coordinate

SETY ycor

moves the turtle vertically to a new absolute vertical coordinate.

HOME

moves the turtle to the center of the screen (0 0)

XCOR

returns the turtle's X coordinate

YCOR

returns the turtle's Y coordinate

HEADING

returns the turtle's heading in degrees

TOWARDS xcor ycor

returns a heading the turtle should be facing to point from its current position to the given position

SHOWTURTLE
ST

makes the turtle visible

HIDETURTLE
HT

makes the turtle invisible

CLEAN

clears the drawing area (the turtles statistics do not reset)

CLEARSCREEN
CS

erases the drawing area and sends the turtle to the home position (Like CLEAN and HOME)

PENDOWN
PD

sets the pen's position to DOWN

PENUP
PU

sets the pen's position to UP

PENDOWNP
PENDOWN?

returns 1 (:TRUE) if the pen is down, 0 (:FALSE) if it's up.

REPEAT numOrVar [ instructionlist
]

runs instructionlist numOrVar times

IF varOrCommand [ instructionlist
]

if varOrCommand is not 0, run instructionlist

TO subroutine [
instructionlist
]

defines a new subroutine (command) named subr_name. When invoked, the subroutine will execute the body of instructions included in the definition.

LESS? num1 num2

returns 1(:TRUE) if its first input is strictly less than its second, or 0 otherwise (:FALSE)

GREATER? num1 num2

returns 1 if its first input is strictly greater than its second, or 0 otherwise

EQUAL? thing1 thing2

returns 1 if the two inputs are equal, 0 otherwise

NOTEQUAL? thing1 thing2 

returns 1 if the two inputs are not equal, 0 otherwise