HP 35s User manual

HP 35s Scientific Calculator
Quick Start Guide
Edition 1
HP part number: F2215-90201

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Printing History
Edition 1, version 4, Copyright December 2008

Contents
Table of Contents
Welcome to your HP 35s Scientific Calculator ........................ 1
Turning the Calculator On and Off ........................................ 2
Adjusting Display Contrast.................................................... 2
Keyboard ........................................................................... 3
Alpha Keys ......................................................................... 4
Cursor Keys ........................................................................ 4
Backspacing and Clearing.................................................... 4
Undo key............................................................................ 5
Using Menus....................................................................... 6
Exiting Menus ..................................................................... 8
Controlling the Display Format .............................................. 8
Operating Modes................................................................ 9
RPN Mode.......................................................................... 9
Algebraic Mode ................................................................ 12
Memory and Variables....................................................... 14
Built-in Functions ................................................................ 15
Physics Constants .............................................................. 18
Fractions .......................................................................... 20
Complex Numbers............................................................. 21
Vectors............................................................................. 23
Statistics ........................................................................... 24
Linear Regression............................................................... 26
Equations and HP Solve ..................................................... 28
Evaluating Expressions ....................................................... 29
Finding Roots of Equations.................................................. 31
Integrating Expressions....................................................... 32

Contents
Linear Solver ..................................................................... 34
Programming .................................................................... 37
RPN Programming Example ................................................ 38
ALG Programming Example ................................................ 40
Additional Resources.......................................................... 42
Warranty and Contact Information ...................................... 43
Replacing the Batteries ....................................................... 43
HP Limited Hardware Warranty and Customer Care .............. 43
Limited Hardware Warranty Period...................................... 44
General Terms................................................................... 44
Exclusions......................................................................... 45
Customer Care .................................................................. 45
Product Regulatory & Environment Information....................... 51

Getting Started 1
1GettingStarted
Welcome to your HP 35s Scientific Calculator
This guide is a supplement to the HP 35s Scientific Calculator
User’s Guide, and it is intended to provide the user with basic
operational information about the calculator. For more detailed
information about the many capabilities of the HP 35s Scientific
Calculator outlined in this guide, refer to the complete user’s
guide on the enclosed CD.
Manual Conventions
In this guide, images of the keys are used along with the
descriptions of the tasks to clarify the steps of operations. Many
of these operations involve the use of the yellow and blue shift
keys, zand {respectively. When a task requires the use of
a shift key, the shift key is not pressed and held while pressing
other keys, like the shift key on a computer. To complete an
operation, press and release the desired shift key and then
press other keys as required, unless directed otherwise.
Keys describing complex tasks are displayed in the order in
which they are to be pressed to complete operations. Pictures of
the calculator display appear in various places throughout the
guide to clarify intermediate steps during entry.

2 Getting Started
Turning the Calculator On and Off
To turn the calculator on, press and release the key. “ON” is
printed on the bottom of the key in blue.
To turn the calculator off, press z. Since the calculator has
Continuous Memory, turning it off does not affect any informa-
tion you've stored.
To conserve energy, the calculator turns itself off after 10 min-
utes of inactivity. If you see the low–power indicator (¤)in the
display, replace the batteries with two new CR2032 (or equiva-
lent) batteries as soon as possible. See appendix A of the HP
35s Scientific Calculator User’s Guide for instructions.
Adjusting Display Contrast
The display contrast depends on lighting, viewing angle, and
the contrast setting. To increase or decrease the contrast setting,
press and hold the Åkey while at the same time pressing Ùor
Ãrepeatedly. Each press of these keys very slightly adjusts the
contrast, darker or lighter, respectively.

Getting Started 3
Keyboard
Features of the Keyboard Shifted Keys
Figure 1 Calculator Keyboard
•Cursorkeyshaveonly
a yellow shift function.
• Most keys have three
functions: one printed
in white, a yellow-
shifted-function printed
above the key, and a
blue-shifted function
printed on the angled
face of the key (See
Figure 2).
• Pressing the shift keys
activates the
corresponding shift
key symbol, ßor à,
at the top left of the
display.
•Thesymboldisplay
remains on until
another key is
pressed. Press the shift
key again to cancel a
shift key.

4 Getting Started
Alpha Keys
Keys with a pink letter displayed on the bottom right corner are
alpha keys, used commonly to enter variables or program
labels. When you are prompted for a letter entry, the A..Z sym-
bol appears in the display, and the alpha keys are active. Press-
ing a letter key turns alpha mode off.
Cursor Keys
Each of the four cursor direction keys is marked with an arrow.
In this text, the cursor keys appear as Õ, Ö, ×and Ø.
Backspacing and Clearing
Table 1 explains how the backspace and clear operations
work.
Figure 2 Key Diagram
Left-shifted
function
Right-shifted
function
Letter for
alphabetic
key

Getting Started 5
Undo key
The operation of the Undo key depends on the calculator con-
text, but it serves mainly to recover from the deletion of an entry,
rather than to undo any arbitrary operation. Press z:
immediately after using aor to recover:
• an entry you deleted, as a digit in an expression.
• an equation deleted while in equation mode.
• a program line deleted while in program mode.
Table 1 Backspace and Clear Operations
Key Description
aBackspace and Clear. If an expression is in the
process of being entered, pressing aerases the
character to the left of the entry cursor ( _ ).
Otherwise, with a completed expression or the result
of a calculation in line 2, ~replaces that result with
a zero. ~also clears error messages and exits
menus.
Clear or Cancel. This key (also the ON key) clears the
displayed number to zero or cancels the current
context (menu, message, prompt, or Equation– or
Program–entry).
{b Clear. The Clear menu has options for clearing the
number in the X-register, all direct variables, all
memory, etc.

6 Getting Started
Undo also recovers the values of a register, or registers, just
cleared using the CLEAR menu, if the undo operation immedi-
ately follows the cleared operation.
Using Menus
Sixteen of the keys are menu keys, keys which permit access to
more functions. These functions are displayed in Table 2.
Table 2 Menu Functions
Menu Name Menu Description
L.R. ¹% Linear regression and estimation.
,
¹(Arithmetic mean of statistical x– and
y–values; weighted mean of statistical x–values.
s,σº+Sample and population standard deviation.
CONST ¹Ü Menu of 41 physics constants.
SUMS º.Statistical data summations.
BASE º¶Base conversions (Base 2, 8, 10 and 16).
INTG ¹gSign value, integer division, remainder,
greatest integer, fractional part, integer part.
LOGIC ¹>Logical operators for base-n numbers.
FLAGS ¹·Functions to set, clear, and test flags.
x?y¹¬ Comparison tests of the X–and
Y–registers.
xy

Getting Started 7
To use a menu function:
1. Press a menu key to display a set of menu items.
2. Press Õ, Ö, ×, or Øto move the underline cursor to the
item you want to select.
3. Press Ïwhile the item is underlined to choose that item.
With numbered menu items, you can also enter the number of the
item.
Note: some menus have more than one page. In these menus,
the ©or ªsymbols on the display indicate there are more
x?0ºComparison tests of the X–register and 0.
MEM ¹uMemory status (bytes of memory
available); catalog of variables; catalog of program
labels.
MODE 9Angular modes and operation mode.
DISPLAY ¹ÞFixed, scientific, engineering, full
floating point display; radix symbol options; complex
number display.
R¶R µ<º;Allows review of the 4-level stack in ALG
mode.
CLEAR º¡ Functions to clear different portions of
memory.
Table 2 Menu Functions
Menu Name Menu Description

8 Getting Started
pages available. Use the Õand Öcursor keys to move to an
item on the current menu page; use the ×and Økeys to
access the next and previous pages in the menu.
Exiting Menus
Whenever you execute a menu function, the menu automatically
disappears. If you want to leave a menu without executing a
function, you have three options:
•Pressingabacks out of a 2–level menu, one level at a
time.
•Pressingaor Åcancels any other menu.
• Pressing another menu key replaces the old menu with the
new one.
Controlling the Display Format
All numbers are stored with 12–digit precision, however, the
number of digits used in the display is controlled in the Display
menu. Press ¹Þ to access this menu. The first four
options (FIX, SCI, ENG, and ALL) control the number of digits in
the display of numbers. See Figure 3.
Figure 3

Getting Started 9
Operating Modes
The HP 35s has two operating modes: Reverse Polish Notation
(RPN) and Algebraic mode (ALG). RPN is usually more efficient
than Algebraic, requiring fewer key presses to solve most prob-
lems. It is also particularly helpful when working through a prob-
lem one step at a time, as all intermediate answers are
displayed.
Algebraic mode allows an expression to be keyed in the order it
is written. No intermediate answers are displayed, as the final
result is calculated in one step.
RPN Mode
Press 9to set the calculator to RPN mode. When the
calculator is in RPN mode, the RPN annunciator is on. In RPN
mode, the result of any computation, whether simple or com-
plex, can be used as the input for the next calculation. RPN uses
a 4–level stack to hold intermediate or previous results. In RPN
mode, values are entered first and then an operation is per-
formed.
The X and Y–registers are displayed, unless a menu, a message,
an equation line, or a program line is displayed. The X–register
is the bottom number displayed, and the Y–register is the top
number. Several function names include an xor y. These refer to
the X– and Y–registers. For example, z!raises ten to the
power of the number in the X–register. The other two stack regis-

10 Getting Started
ters are labeled Z and T.
The 9(roll down) key reviews the contents of the stack by
"rolling" the contents downward, one register at a time. Sup-
pose the stack is filled with 1, 2, 3, 4
(1Ï2Ï3Ï4). Pressing 9four times
“rolls” the numbers back into their original order. (See Figure 4).
The 8(roll up) key works the same as 9, except it "rolls" the
stack contents upward.
Figure 4 RPN Stacks
The Zkey (x exchange y) switches the contents of the X–
and Y–registers without affecting the rest of the stack. Pressing
Ztwice restores the original order of the X– and Y–register.
The Zfunction is used primarily to swap the order of num-
bers in a calculation. For example, to calculate 9 ÷ (13 x 8),
enter 13Ï8¸9w¯.
The LAST X register is a companion to the stack; it holds the
T14321
Z21432
Y32143
X4<3<2<1<4

Getting Started 11
number that was in the X–register before the last numeric func-
tion was executed. Pressing ºÍ returns this value into the
X–register. Retrieving the "last x" has two primary uses, correct-
ing errors and reusing a number in a calculation. For example,
suppose you wanted to find the square root of a number, but
pressed Tby mistake. You don't have to start over! To find
the correct result, press ºÍ?.
Some numerical operations require a single number for input,
such as º&, and k. In RPN mode, enter the number first
and then the operation to be applied. For example, to square 3,
press 3º=.
Some operations require two numbers, such as Ù,)and
¹x. The Ïkey is used to separate two numbers keyed
in one after the other. For example, suppose the stack is already
filled with 1, 2, 3, and 4 and you wish to evaluate 5+6. Press
5Ï6Ù. When 5is pressed, the contents of the stack
are pushed up one level – the previous value of 1 in the T regis-
ter is lost. Pressing Ïcopies the X register to the Y register,
pushing up the stack contents again but disabling stack lift. This
stack lift disable condition after pressing Ï allows the 6
keyed in next to overwrite the copy of 5 in the X register without
pushing the stack up. The Ùadds the X and Y register contents
together and drops the other stack values down one level.
Therefore, the value of 3 in T is copied down to Z as shown

12 G e t t i n g S ta r t e d
below. The LAST X register would hold the value of 6 in this
example.
Figure 5
1 is lost 2 is lost
The stack allows longer problems to be evaluated easily. For
example, to solve , press
10Ï5Ã17Ï12Ã4¸¯.
Algebraic Mode
In Algebraic mode (ALG), arithmetic operations are preformed
using the standard order of operations. Press 9to set
the calculator to ALG mode. When the calculator is in ALG
mode, the ALG annunciator is on.
In ALG mode, numerical operations requiring a single number
for input, such as &and k, are evaluated by keying the
T12 333
Z23 443
Y34 554
X455611
10 5–()17 12–()4×[]÷

Getting Started 13
operation first, then the number, followed by Ï. To
square the number 3, press º=3Ï.
For operations requiring two numbers, such as Ù, Ã,
¸, ¯, and ), key the first argument, followed by the
operation to be performed, then key the second argument
and press Ïto evaluate the operation. For example,
to evaluate 3+4, press 3Ù4Ï. To compute 34,
press 3)4Ï.
For other operations requiring two arguments, such as ¹',
¹p, and ¹x, key the operation first. The opera-
tion is prompted with open and close parentheses with a
comma separating the arguments. The cursor is positioned
just inside the open parenthesis. Key the first argument,
press Õto move across the supplied comma, and then
key the second argument followed byÏ.For example,
to compute the number of combinations of 69 items taken
2 at a time, press ¹x69Õ2Ï.
Figure 6
Once an expression has been evaluated, by pressing Ö

14 G e t t i n g S ta r t e d
and placing the cursor at the end of that expression, the
expression can be changed and reevaluated. For example,
if after computing the number of combinations of 69 items
taken 2 at a time, you then decide to determine the num-
ber of combinations of 69 items taken 3 at a time, rather
than entering the expression all over again, press
ÖÖ~3Ï. For longer, more complicated expres-
sions, this is often much easier than entering an entire
expression again.
In ALG mode, operations are carried out in order of alge-
braic precedence, where certain functions are evaluated
before others. For example, 1Ù2¸3Ï would
evaluate to 7, since multiplication is done before the addi-
tion. To change this, use parentheses to alter the expres-
sion: 41Ù2Õ¸3Ï. In this instance, the
parentheses are evaluated first, resulting in a value of 9
rather than 7.
Memory and Variables
The HP 35s has 30KB of memory for storing numbers, equa-
tions and programs. Numbers are stored in locations called
variables or registers. Variables are named with a letter from A
to Z, giving 26 directly addressable memory registers. There are
also six registers that contain information for statistical calcula-

Getting Started 15
tions. These variables are always available for use. For exam-
ple, in ALG mode, to save the currently displayed value into
register Q, press ºeQÏ. To recall the value to use it
again, press hQÏ. The stack registers X, Y, Z, and T
are not the same as the memory registers with the same letter.
For example, ºeT stores a number into variable T, not
stack register T. The wfunction does not swap the values of
the data registers X and Y but swaps stack registers X and Y.
Memory is allocated to registers indirectly addressed. Reference
these indirect registers by storing the numeric address desired
into variable I or J and use the special functions ºe7or
ºeAto store a value indirectly. For example, in ALG
mode, to store a future result into indirect register 3 using regis-
ter J, first store 3 into J by pressing 3ºeJÏ, com-
pute the value to store and press ºeAÏ. If J still
holds 3, pressing hAÏrecalls the value later for use.
Built-in Functions
Some of the many built-in functions are listed in Table 3.

16 G e t t i n g S ta r t e d
Table 3 Built-in Functions
Keys Functions
z"Numeric integration of an
equation
ºÛ Numeric evaluation and roots of
an expression
º&z$º#
¹!
Natural and common logarithm,
and
)¹',?º= , , reciprocal, , and
ºm¹p Percent and percentage change
knq Sine, cosine, tangent, and
inverses
¹:knq Hyperbolic trigonometric
functions and inverses
º¶ (Menu) Conversion of numbers in bases
2, 8, 10 and 16
¹> (Menu) AND, XOR, OR, NOT, NAND
and NOR operations
ex10x
yxy
xx
x2