HP 15C User Manual download pdf (Page 109)

Section 10: The Index Register and Loop Control 109

To Labels. If the R

value is positive, t V and G V will

transfer execution to the label which corresponds to the number in the Index

For instance, if the Index register contains 20.00500, then a tV

instruction will transfer program execution to ´b A. See the chart

on page 107.

To Line numbers. If the R

value is negative, tV causes branching

to that line number (using the absolute value of the integer portion of the

value in R

For instance, if R

contains 20.00500, then a tV instruction will

transfer program execution to program line 020.

Indirect Flag Control With V

F V, " V, or ? V will set, clear, or test the flag (0 to 9)

specified in R

(by the magnitude of the integer portion).

Indirect Display Format Control With V

´ • V, ´ i V, and ´ ^ V will format the

display in their customary manner (refer to pages 5859), using the number

in R

(integer part only) for n, which must be from 0 to 9.

Loop Control With Counters: I and e

The I (increment and skip if greater than) and e (decrement and

skip if less than or equal to) functions control loop execution by referencing

and altering a loop control number in a given register. Program execution

(skipping a line or not) then depends on that number.

The key sequence is ´ { I, e } register number. This number is

0 to 9, .0 to .9, V ,or %.

The Loop Control Number. The format of the loop control number is:

nnnnn.xxxyy, where

±nnnnn

is the current counter value,

xxx

is the test (goal) value, and

Is the increment of decrement value

Except when using f (section 14)

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HP 15C User Manual Page 109