106
Section 10
The Index Register
and Loop Control
The Index register (R
I
) is a powerful tool in advanced programming of the
HP-15C. In addition to storage and recall of data the Index register can use
an index number to:
Count and control loops.
Indirectly address storage registers, including those beyond R.
9
(R
19
).
Indirectly branch to program line
numbers,
as well as to labels.
Indirectly control the display format.
Indirectly control flag operations.
The
V
and
%
Keys
Direct Versus Indirect Data Storage With the Index Register
The Index register is a data storage register that can be used directly, with
V
, or indirectly, with
%
.
*
The difference is important to note:
V
%
The
V
function uses the
number itself
in the Index
register.
The
%
function uses the absolute
value of the integer portion of the
number in the Index register to
address
another
data
storage
register. This is called
indirect
addressing.
*
Note that the matrix functions and complex functions use the
V
and
%
keys also, but for different
purposes. Refer to sections 11 and 12 for their usage.
Summary of Contents for HP-15C
Page 1: ...HP 15C Owner s Handbook HP Part Number 00015 90001 Edition 2 4 Sep 2011 ...
Page 17: ...Part l HP 15C Fundamentals ...
Page 64: ......
Page 65: ...Part ll HP 15C Programming ...
Page 118: ...118 ...
