HP 15c - Manual (Page 45)

Section 3: The Memory Stack, LAST X, and Data Storage 45
Example: Keep a running count of your newly blooming crocuses for two
more days.
Keystrokes Display
8 O 0
8.0000
Places the total number of blooms as of
day 2 in R
0
.
4 O + 0
4.0000
Day 3: adds four new blooms to those
already blooming.
3 O + 0
3.0000
Day 4: adds three new blooms.
24 l - 0
9.0000
Subtracts total number of blooms
summed in R
0
(15) from the total
number of plants (24); 9 crocuses have
not bloomed.
l 0 15.0000
(The number in R
0
does not change.)
Overflow and Underflow
If an attempted storage or recall arithmetic operation would result in
overflow in a data storage register, the value in the affected register will be
replaced with ±9.999999999×10
99
and the display will blink. To stop the
blinking (clear the overflow condition), press − or = or | " 9.
In case of underflow, the value in the register will be replaced with zero (no
display blinking). Overflow and underflow are discussed further on page
61.
Problems
1. Calculate the value of x in the following equation.
(2.01) (1.71) 2.75) (3.15 4.3
0.32] 7.46) [(8.33 5.2) (4 8.33
x
 
  

Answer: 4.5728.
A possible keystroke solution is:
4
v 5.2 - 8.33 * | K 7.46 - 0.32 * ÷ 3.15
v 2.75 - 4.3 * 1.71 v 2.01 * - ч ¤