HP 25 User Manual

Programming 97
Program Applications
The following two programs are provided as additional ex-
amples to test your programming skills. On ly 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 factoria l of an input value " n"
[n (n-l)(n - 2) . . . 3 x 2 xl]. (For the special case where n = 0,
O! = 1.) Switch to PRGM mode PRGM'-RUN and press D
I PRGM I before keying in the following list of keys.
Keys
Display
EI [ABSJ
1 01
15
03
D ~
102
14 01
E m
103
23 01
EI §l
104
15
71
mm m0
105
13
14
m
1 06
01
D ~
1 07
14
71
mm m[I]
108
13
16
EiD
109
21
m
1 10
01
B
111
41
D 0m
1 12
23 61
01
mm @J[I]
It3
13 06
m
1 14
01
mm @J@J
I 15
13 00
a m
1 16
24 01
Now switch back to RUN mode PRGM ~ RUN and press
I PRGM I so you can try the following examp le.
Example. Calculate the number of ways six people can line up
for a
photograph .
Method:
P6 = 6!
Press
Display
6 lMJ
L.: 17 -= 2 :.::. 0 .:..: .0 c.:: 0 ___ --.J1 (6 x 5 x 4 x 3 x 2 x I)

HP 25 Specifications

General

Brand	HP
Model	25
Category	Calculator
Language	English