HP HP-67 - Page 213

Subroutines 209
Create, load, and run a program that will display all permuta-
tions of any three integers that you have stored in registers R,
R,, and R;. For example, all permutations of the integers 1, 2,
and 3 might be displayed as:
123
132
213
231
312
321
The following subroutine will cause the digits you recall from
Ri, R,, and R; to be displayed as a permutation in the order you
have recalled them. Use the subroutine and the flowchart on the
following page to help you create and load the program.
o1
1
0
0
8
0 = This subroutine pauses to
1 display numbers recalled into
0 the Z-, Y-, and X-registers of
O the stack as nnn.
0
o
The program should recall the contents of storage registers R,
Ry, and R; into the Z-, Y-, and X-registers of the stack and then
use the “‘display nnn’’ subroutine to show them in the order that
they are recalled.