HP HP-65 - Page 56

Sample Case: Repeating and Stopping
Assume that you get a 15% discount (i.e., you pay 85%) on the
following purchases:
Quantity Price of Each
5 $2.00
7 4.00
8 5.00
22 6.00
Create a program at the top of memory to display the cumulative
cost.
Only two unfamiliar operations ([&ifg) and [&})
are needed. They are summarized in Figure 4-3.
Method. After clearing the stack once at the start, let the pro-
gram stop to accept data and to display any previous accumu-
lation (zero, at first). Then key in:
Quantity [ENTER% Price
Have the program then calculate the discounted cost (5 X 2 X
.85, the first time), adding the cost to the previously accumulated
total. Repeat this for the second, third, and fourth pairs which
are to be entered after the respective stops. The flowchart (p. 55),
shows the process.
Writing the Program
1. To key in the program set the mode switch to W/PRGM.
2. Press [f to clear program memory.
3. Key in the program.
Again, for now, if you make a mistake, clear memory and start
over.
Press Comment
B
Clear the stack.
] Identify place to start repetition.
) Stop the calculator.
R/S } During the stop, key in a pair of
values and press to restart
the program.