You will find here a list of the functions and variables of Logo. For a more complete description and examples, please consult the user's guide

1.Instructions not returning a value:
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back(distance);

background color(color);

change angle(angle);

change font(name);

change size(size);

change style(number);

change x(number);

change xy(number1,number2);

change y(positiony);

clear screen();

circle(distance x,distance y);

don't wrap();

draw();

fill circle(distance x,distance y);

fill round square(distance x,distance y);

fill square(distance x,distance y);

forward(distance);

full screen();

hide cursor();

hide turtle();

image("name",dimension x,dimension y);

initialize();

mask();

normal screen();

pen color(color);

pen down();

pen up();

print("sentence");

right(angle);

round square(distance x,distance y);

show turtle();

square(distance x,distance y);

unmask();

wait for click(); 

wrap();


2. Instructions returning a value:
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These instructions are useful for calculating numbers.

read character(variable);

variable=absolute(number);

variable=arccosine(value);

variable=arcsine(value);

variable=cosine(angle);

variable=logarithm(number);

variable=sinus(angle);

variable=square root(number);

variable=tangent(angle);


3.Variables:
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There is a certain number of pre-defined variables.  Most of these can have their names and values changed by the user. A few of these, followed by an asterisk *, cannot have their value changed by the user : these variables are read-only variables.

Colors

Color	RGB Number

brown
blue
gray
yellow
purple
black
orange
red
green
cyan
white


character font

character style

character size

random*

randomscale

receive angle*

receive x*

receive y*

return*

x dimension*

x position*

y dimension*

y position*

A special type of function :

read character(variable);