HP 15c Collector's Edition User Manual

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 itsel
f 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.

HP 15c Collector's Edition Specifications

General

Brand	HP
Model	15c Collector's Edition
Category	Calculator
Language	English