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1994-02-12
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Misty 1.0A Expression Evaluator p 1.
copyright 1994 by Peter Neuendorffer
pg.
I. INTRODUCTION 1
- What it does
- Shareware
- Installation
II. CALCULATION 2
- Expressions
- Operators and Variables
III. FEATURES
- Evaluate
- Store
- Retrieve
- History
- Log
- Info
I. INTRODCUTION
What it does.
This software functions much like a pocket calculator. You
can do arithmetic and store formulas as numerical expressions.
Numerical expressions can be arithmetic or a combination of
variables. The expression could be 2+2, or a+b, or it could
be the formula for the hypotenuse of a triangle (sqrt(b^2+h^2)).
You can store these expressions on disk with the Store feature.
You can save your answers on disk with the Log feature. You
can call up previous answers and variables from the current
session with the History feature. You can recall stored
expressions and edit them again with the Retrieve feature.
A crib sheet of information is provided in the Info feature.
Say your expression is "a+b" (without the quotations). You
could evaluate this by entering in "a+b" (without the quotations)
in the Evaluate option. Then fill in the variable values for
a, and b. Then press enter. The answer is given. More on what
you can do in the section below entitled CALCUALATION.
This software handles addition, subtraction, multiplication,
division, exponents (including fractional exponents), sine,
cosine and tangent. You can use decimal or "real" numbers.
Scientific notation is supported, such as "2E+5".
Shareware.
This program is Shareware. It is not free.
You may distribute it freely, and use it yourself for a period
of up to three weeks. Then, you are asked, on the honor system,
to pay for it by sending $15.00 registration fee to:
Peter Neuendorffer
1399 Commonwealth Ave #11
Allston MA 02134
Telephone 617-254-2213 voice (7-11PM EST)
Installation.
Copy all the files to an empty sub directory on your hard drive.
A hard drive is recommended but not mandatory.
Run the software from the drive and directory that it is located.
From DOS run MISTY. This is NOT a Windows program.
II. CALCULATION p 2.
-Expressions.
In the English, or other word language, an expression is a
collection of symbols that takes on one agreed upon meaning.
Much as in word languages, an arithmetic expression is a collection
of numbers or variables (operands) combined with arithmetic symbols
-such as "-" or "+"- (operators). These symbols are combined according
to certain rules, or the "math". If this sounds like gobbledygook,
here are some examples of expressions that this software excepts,
and evaluates:
expression ....operator..... means
5 constant the number five.
5+2 + addition five plus two.
5-2 - subtration five minus two.
5*2 * multiplication five times two.
5/2 / division five divided by
two giving a decimal answer.
sin(2) sin sine the sine of two.
cos(2) cos cosine the cosine of two.
tan(2) tan tangent the tangent of two.
a+b + addition The value of a plus
the value of b
4^2 ^ exponent 4 squared (4*4)
4^(1/2) ^ exponent the square root of 4
sqrt(8) sqrt square root square root of 8
2E+1 E scientific 2 times 10 (once)
2E-1 E " 2 times .1 (once)
-----------------------------------------------------
Actual expressions can be quite long: (a*b/c)+0.5^(3.1)-2/4
In addition the trigometric constant "pi" is supported as pi.
-----------------------------------------------------
You may enclose parts of the expression in parentheses ()
For example, (4+b)*6 is allowed, and is different
from 4+b*6 in the order that the numbers are combined.
The first example adds 4 to b first, while the second
multiplies b times 6.
------------------------------------------------------
You may use the single letter variables a through z in
your expressions, excepting the letter e which is reserved
for scientific notation.
------------------------------------------------------
- Operators and Variables.
In the order that they are evaluated by the software:
+ - "unary" a negative number such as -10
E scientific
^ exponent
sin cos tan trigometric functions taken on angles
that are given in radians.
multiply divide
add subtract
--------------------------------------------------------
Variables always have a given value at the time you evaluate your
expression. The variable letters you use "stand in" for the
value, which you fill in. Thus is your expression is a+b-c, then
you need to fill in the values of the variables, such as a=1, b=2, c=3.
This software does not use formulas with the equals sign. If you
enter in a formula for an expression, such as a=b+c, then everything
to the left of the equals sign, including the equals sign, is ignored.
----------------------------------------------------------
Positive and negative numbers from -10^36 to 10^36 are supported.
The accuracy of fractional exponents less than one varies. 2^(1/3)
is quite accurate to four places. 2^(1/3.1) is not so accurate.
Numbers are generally significant to 10 places. Such as 1234567890
III. FEATURES p 3.
-Evaluate.
This is where you get your answers and evaluate expressions.
From the main menu, select Evaluate with the up and down arrow
keys, and press Enter.
Now enter in an expression. When you press Enter any time you
enter an expression, the expression is "remembered" for the
next time you enter in an expression.
You are taken to a black screen where you see your expression.
If there were no letter variables in the expression, your answer
is given. Press Escape to exit back to the main menu.
If there are letter variables in your expression, such as in the
expression s*b^3/4, you may fill in the values for the variables.
Use the up, down, left and right arrow keys to select the variable,
and type in the value. Don't press Enter till you are done.
After you press enter, your answer is given.
Repeat the process, or press Escape to exit. The F10 key will allow
you to take the last answer anytime, and use it for a variable value.
When entering in variables, you may use an expresssion, even one
involving other variable letters. If you use a letter that is
not in the expression, the value of the letter is zero.
Some errors may occur. They could be "divide by zero" because
the calculation involved dividing by zero. Error in expression
ususally indicates that the expression is written incorrectly.
A circular reference means you have variables that depend on each
other. Too many terms means the expression is too complicated.
If the expression involves a fracional root of any kind of a
negative number than the error "attempt to take root of negative
number" is displayd.
-----------------------------------------------------------
You will find this process repeated in the Features "Retrieve"
and "History Display" with variations.
-Store.
You may wish to store an expression (not the answer) for a rainy
day. To do this, choose Store from the main menu. Then enter
in an expression. Then give it a title in words such as
"Area of a circle". Then you can add any notes you wish to include.
The expression is now stored on disk.
-Retrieve
You retrieve an expression that is stored on disk. Choose Retrieve
from the main menu. Then you have two choices:
Use stored expression:
You will see a menu of your stored expressions. If it is
longer than a page, use the page up and page down keys.
Use the up and down arrow keys to select an expression,
and press Enter. You are now brought to the same screen
as in Evaluate, and you can Evaluate the expression, or
press Escape to exit.
Edit stored expression:
You can edit the expression, title, and notes, but you
will not be using the expresssion directly to get an answer.
(III. FEATURES continued) p 4.
-History Display.
Whenever you evaluate an expression, a revolving "snapshot" is
taken of the screen. The last 20 answers are saved in this
history list. From the main menu, select History Display.
Use the page up key to go back in the list. Forward with page down.
If you want to re-avaluate a previous answer, press F3 on the
screen you wish to evaluate. You are brought once again to
the same screen as in Evaluate.
Otherwise press Escape to exit.
-Log.
You can store your current session on disk with a "Log" file. Note
this is different from the stored expressions, which do not contain
answers; and it is different from the History list, which only
exists while you run the program.
Turn on the log file by choosing Log from the main menu. Enter a
file name such as save.doc. Press Escape. Now any time you
get an answer, the screen will be saved in the file save.doc on
disk. Turn off the log file by selecting Log again from the
main menu. If you use a log file name that already exists, the
log is added on to the previous file on disk.
-Info: A screen of notes on this software. Select Info from the main
menu. Press Escape to exit.
-------------------------------------
This version 1.0A is corrected from 1.0. The main difference is that
a better approximation for fractional roots was added.