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1990-03-04
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IRA Calculator
by Joel Swank
September 27 1989
The IRA calculator allows easy calculation of future values of
investment. It opens a Workbench window with 5 gadgets. You enter
four values into the four string gadgets. "Balance" is the beginning
investment value. "Interest" is the annual percentage rate earned by
the investment. "Deposit" is the ammount of new capital added to the
investment each year. "Years" is the number of years to accumulate
the investment. When all data is correct, click the "Calculate" gadget.
The new balance will be put back into the "Balance" gadget. You can
do many years in one calculation, or just do 1 year at a time, changing
the data each time.
The Menu provides save and load items to store the data in a file.
There is also a help screen item and an item to print the current data.
IRA may be run from the workbench icon or from the CLI. It accepts
parameters from the command line or from the tooltypes array of the icon.
CLI calling format:
>ira -w -bnnnnn.nn -ann.nnn -dnnnn.nn -ynn filename
The PARAMETERS:
WB: BALANCE=nnnnn.nn
CLI: -bnnnnn.nn
The beginning balance of the investment.
WB: INTEREST=nnn.nnn
CLI: -ann.nnn
The annual interest rate in percent.
WB: DEPOSIT=nnnnn.nn
CLI: -dnnnn.nn
The ammount of new capital added to the investment each year.
WB: YEARS=nn
CLI: -ynn
The duration of the investment in whole years.
WB: FILE=filename
CLI: filename
A file containing the above data. Created by the SAVE menu item.
FILE Format:
The data file created by IRA contains one line of ASCII characters.
It contains the four data items separated by commas. The order of the
data is BALANCE, INTEREST, DEPOSIT, YEARS. The first 3 are floating
point numbers and may contain a decimal point. The last must be an
integer.
LIMITS:
BALANCE must be greater than 0.
INTEREST must be less than 99.0 and greater than 0.
DEPOSIT must be posative.
YEARS must be greater than 0.