HP 12c Owners Manual

  Appendix A: The Automatic Memory Stack  171 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 171 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Now let’s see what happens in the stack during a chain calculation: 
7) 6 5 ( ) 4 3 (
×+×=
=
See how the intermediate results are not only displayed when they are calculated, 
but also automatically stored and available in the stack at just the right time!=
That

172  Appendix A: The Automatic Memory Stack 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 172 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Termination of Digit Entry 
The first digit keyed in after digit entry has been terminated replaces the number 
already in the displayed X-register. Digit entry is automatically terminated when 
any key is pressed (except for digit entry keys — digit keys,.
, Þ
, and É 
— 
and prefix keys — f
, g
,?
, :
, and i
). 
Stack Lift...

  Appendix A: The Automatic Memory Stack  173 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 173 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Pressing d
 four times successively displays the numbers in the Y-, Z-, and 
T-registers and returns the numbers to their original registers. 
 
One-Number Functions and the Stack 
One-number mathematics and number-alteration functions — y
, r
, °
, >
, 
e
, B
, Ñ
, and T
 — use only the number in the displayed X-register. 
When...

174  Appendix A: The Automatic Memory Stack 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 174 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
 
When an arithmetic operation or q
 is performed, the answer is placed in the 
X-register, the number formerly in the X-register is copied into the LAST X register, 
and the stack drops. When the stack drops, the number in the Z-register is copied 
into the Y-register, and the number in the T-register is copied into the...

  Appendix A: The Automatic Memory Stack  175 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 175 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Calendar and Financial Functions 
The following table shows what quantity is in each stack register after the indicated 
calendar or financial function key is pressed. The symbols x, y, z, and t represent 
the number that was in the corresponding register (X, Y, Z, or T, respectively) at 
the time the function key was pressed....

176  Appendix A: The Automatic Memory Stack 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 176 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
The LAST X Register and the  Key 
The number in the displayed X-register is copied into the LAST X
 register 
whenever any of the following function keys is pressed: 
+
 -
 §  z
 y
 
q
 >
 ¿
 r
 B
 
T
 Ñ  _
 ^
 Q
 
R
 e
 b
 à
 Z
 
D
 Ò
    
Pressing gF
 lifts the stack (unless \
, O
, _
, ^
, A
, or C
 was the 
last key pressed,...

  Appendix A: The Automatic Memory Stack  177 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 177 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
The diagram on page 171 illustrates how the automatic stack lift and stack drop 
make chain calculations quick and error-free. 
Virtually every chain calculation you are likely to encounter can be done using 
only the four stack registers. However, to avoid having to store an intermediate 
result in a storage register, you...

178  Appendix A: The Automatic Memory Stack 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 178 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Keystrokes Display  
84000 
84,000. Enters base amount into displayed 
X-register. 
§ 
168,000.00 Annual sales after first year. 
§ 
336,000.00 Annual sales after second year. 
§ 
672,000.00 Annual sales after third year. 
In the example above, the constant was repeatedly multiplied by the result of the 
previous operation,...

 
179 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 179 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
  Appendix B 
More About L 
Given a sequence of positive and negative cash flows, we hope that there is 
enough information to determine whether an IRR answer exists, and what that 
answer is. For the vast majority of cases, your hp 12c will find the unique IRR 
answer if it exists. But the IRR computation is so complex that if the cash flow 
sequence does not meet...

180  Appendix B: More About L 
 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 180 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Your guess will aid the calculator in its search, and if it finds an IRR answer near 
your guess, that answer will be displayed. Since the calculator cannot tell you the 
number of solutions that exist when there is more than one mathematically correct 
answer, you can continue to make guesses, pressing :gt
 after each one, 
to search for IRR...