Calculator; Logo - VTech Power Zone 2000 User Manual

CALCULATOR

This is an eight-digit, fully functional calculator for addition, subtraction, multiplication
and division. You can move the pointer to click on the calculator buttons or use
the keys from the keyboard to perform a calculation. The Calculator can be used
to determine the answer to some of the questions in the Mathematics activities
by pressing the Calculator icon. You can return to the activity by clicking the
Return icon. Be sure to press the AC button to clear the Calculator before each
calculation.

LOGO

This activity 'LOGO' lets you experience logo programming. You can learn more
in other reference book.
LOGO is a programming language that can be used to teach your PC to do
some new things. One thing LOGO can teach your PC is how to draw pictures.
This system of drawing is called Turtle Graphics.
commands
Instructions to the Turtle are called commands. Each command begins with a
key word telling the Turtle what to do. For example, "forward" is a command that
tells the Turtle to move forward; "right" is a command that tells the Turtle to turn
to the "right." Often, commands will require additional information such as how
far forward the Turtle should go. For example, "forward 30" tells the Turtle to move
forward 30 steps; "right 90" is a command that tells the Turtle to turn 90 degrees
(a quarter turn) to the right. If additional information is required for a command,
it must appear immediately after the command and separated from the command
by a space.
In the home position, the Turtle, represented by a triangle, sits at the center of
the screen pointing straight up. This location is indicated with the pair of numbers
(0,0). The first number of this pair indicates how far left or right the Turtle is
from the center of the screen; it is also called the x-coordinate. The second number
indicates how far up or down the Turtle is from the center of the screen; it is
also called the y-coordinate. For example, the pair (10, -5) indicates that the Turtle
is 10 steps to the right and 5 steps below the center of the screen.
routines
Additional commands can be created by defining new LOGO routines. For
example, here is a LOGO routine that could create a square:
to square
forward 30
right 90
forward 30
right 90
forward 30
right 90
forward 30
right 90
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