HP HP-25 User Manual

Program Applications
The following two programs are provided as additional ex-
amples to test your programming skills. Only the purpose of
each program is explained. See if you can figure out how each
program works on your own.
Factorial
This program calculates the factorial of an input value “‘n
[n (n-1)(n-2)...3x2x 1]. (For the special case where n = 0,
0! = 1.) Switch to PRGM mode erem [[[H@~~ and press|
before keying in the following list of keys.
Keys Display
Bl [ass] 01 15 03
B () 02 14 01
BA 1] 03 23 01
T
B0
] 06 01
B =)
&R (](e] 08 13 16
10 01
=]
B
R (0] (6] 13 13 06
[
B8 (0][0]
=) 16 24 01
Now switch back to RUN mode rrew Bl ~ov and press
so you can try the following example.
Example. Calculate the number of ways six people can line up
for a photograph.
Method: P, = 6!
Press Display
6 [R5] 720.00 (6 X5x4x3x2x1)

HP HP-25 Specifications

General

Brand	HP
Model	HP-25
Category	Calculator
Language	English