HP 15C Uživatelský manuál stáhnout pdf (Strana 110)

110 Section 10: The Index Register and Loop Control

For example, the number 0.05002 in a storage register represents:

nnnnn x x x y y

0.0 5 0 0 2

Start count at zero. Count by twos.

Count up to 50.

I and e Operation. Each time a program encounters I or

e it increments or decrements nnnnn (the integer portion of the loop

control number), thereby keeping count of the loop iterations. It compares

nnnnn to xxx, the prescribed test value, and exits the loop by skipping the

next line if the loop counter (nnnnn) is either greater than (I) or less

than or equal to (e) the test value (xxx). The amount that nnnnn is

incremented or decremented is specified by yy.

With these functions (as opposed to the other conditional tests), the rule is



False (nnnnn  xxx)

True (nnnnn > xxx)

instruction

´IV

loop

t. 1

instruction

exit loop

For I: given nnnnn.xxxyy, increment nnnnn to nnnnn + yy, compare

it to xxx, and skip the next program line if the new value satisfies nnnnn >

xxx. This allows you to exit a loop at this point when nnnnn becomes

greater than xxx.

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HP 15C Uživatelský manuál Strana 110