LOGO Primitives

 

Command

Short Form

Example

Description

Chapter 9

MAKE

MAKE

MAKE X 50

Defines a global variable and assigns an initial value.

LOCAL

LOCAL

LOCAL X

Changes a global variable to a variable that is local to the procedure where this command occurs.

 

 

 

 

Command

Short Form

Example

Description

Chapter 11

PRINTOUT NAMES

PO NAMES

PO NAMES

Prints out all of the global variables.

ERN

ERN

ERN X

ERN removes the variable(s) specified by its input from the Logo workspace

ERASE NAMES

ERASE NAMES

ERASE NAMES

ERASE NAMES removes all user-defined variables from the workspace.

 

 

 

 

Command

Short Form

Example

Description

Chapter 12

REMAINDER

 

REMAINDER 5 2

Result: 1

Reports an integer remainder of the first number divided by the second number.

INT

 

INT 8.9

 

Result: 8

INT reports the integer portion of its input by removing the decimal portion, if any. No rounding occurs.

ROUND

 

ROUND 1.5

 

Result: 2

ROUND reports the input number rounded to the nearest integer.

SQRT

 

SQRT 2

 

Result: 1.41

Outputs the square root of its input. The input number must be a positive number.

ATAN

 

ATAN 0.5

Result: 26.57

Gives the arctangent of its input.

SIN

 

SIN 30

 

 

Result: 0.5

SIN reports the sine of its input, which is the number of degrees in an angle.
Remember that SIN x =opposite/hypotenuse.

COS

 

COS 60

 

 

Result: 0.5

COS reports the cosine of its input, which is the number of degrees in an angle.
Remember that COS x =adjacent/hypotenuse.

RANDOM

 

RANDOM 5

 

This could report a 1, 2, 3, 4, or 5

RANDOM reports a randomly selected number from 1 through its input. The output can only be a positive integer.

ABS

 

ABS 10

Result: 10

ABS reports the absolute value of its input.

PI

 

PI

Result: 3.14

Reports the value of PI