HP 15C User Manual download pdf (Page 106)

106

Section 10

The Index Register

and Loop Control

The Index register (R

) 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.

 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:

The V function uses the

number itself in the Index

The % function uses the absolute

value of the integer portion of the

number in the Index register to

address another data storage

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.

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HP 15C User Manual Page 106