morilib Logo

Fundermental

Commands

if expr [command...]

executes the commands if expr is true, otherwise do nothing.

repeat expr [command...]

repeats the commands expr times.

"word

quotes the text string.

:symbol

refers the value which is bounded by symbol.

forword distance
fd distance

forword the turtle distance pixels.

backword distance
back distance
bk distance

backword the turtle distance pixels.

left angle
lt angle

rotate angle degrees counterclockwise.

right angle
rt angle

rotate angle degrees clockwise.

left angle
lt angle

rotate angle degrees counterclockwise.

clearscreen
cs

clear the screen and the turtle is set to home position.

penup
pu

The turtle do not draw a line when the turtle moves.

pendown
pd

The turtle draw a line when the turtle moves.

hideturtle
ht

hides the turtle.

showturtle
st

shows the turtle.

home

moves the turtle to home position.

label thing

draws the thing to position of the turtle.

make word thing

binds thing to word

sum val1 val2

Compute val1 + val2.

difference val1 val2

Compute val1 - val2.

product val1 val2

Compute val1 * val2.

quotient val1 val2

Compute val1 / val2.

modulo val1 val2

Compute val1 % val2.

power val1 val2

Compute val1 to the val2.

and val1 val2

returns 1 if both of val1 and val2 is not 0, otherwise 0.

or val1 val2

returns 1 if one of val1 and val2 is not 0, otherwise 0.

not val1

returns 1 if val1 is 0, otherwise 0.

word? thing

returns 1 if thing is a word, otherwise 0.

number? thing

returns 1 if thing is a number, otherwise 0.

equal? thing1 thing2

returns 1 if thing1 is equal to thing2, otherwise 0.

notequal? thing1 thing2

returns 1 if thing1 is not equal to thing2, otherwise 0.

greater? thing1 thing2
greaterequal? thing1 thing2
less? thing1 thing2
lessequal? thing1 thing2

returns 1 if thing1 and thing2 satisfies the relation, otherwise 0.

window
fence

do nothing, these commands are reserved.

to procname :argument... command... end

defines the procedure named procname.
The body of the procedure is given by command..., and the arguments are given :argument. The arguments are optional.

procname argument...

calls the procedure procname

Expressions