HP HP-67 - Page 187

Branching 183
Use the flowchart on the follow-
ing page to create a program that
computes and pauses to display
the future value (FV) of a com-
pound interest savings account in
increments of one year according
to the formula:
FV = PV(l + i)
where FV = future value of the savings account.
PV = present value (or principal) of the account.
i =interest rate (expressed as a decimal
fraction; e.g., 6% is expressed as 0.06).
n = number of compounding periods (usually,
years).
Assume that program execution will begin with i entered into the
Y-register of the stack and with PV keyed into the displayed
X-register.
After you have written and loaded the program, run it for an
initial interest rate i of 6% (keyed in as .06) and an initial deposit
(or present value, PV) of $1000.
(Answer: 1%t year, $1060; 2"¢ year, $1123.60;
3™ year, $1191.02; etc.)
The program will continue running until you press (or any
key), or until the HP-67 overflows. You can see how your
savings would grow from year to year. Try the program for
different interest rates i and values of PV.
Write a program using that will use the factorial function
((NJ) to calculate and pause to display the factorials of succes-
sive integers beginning with the number 1. (Hint: Place 1 in a
Storage register, recall it, then use storage register arithmetic to
increment
the
number
in
the
storage
register,
etc.)