HP 35s Instruction Manual page 5

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HP 35s Using Calculator Memories to Help Solve Problems
In RPN mode the calculation would be carried out using the following keys:
Calculate the value and store it in V:
As the value is already on the stack, just calculate its arc sine, then multiply by 5:
º
Next, divide by the arc cosine of the expression, which is recalled from V:
º
Now multiply by the square root of three times the expression. In RPN there is no need for brackets:
Answer: In RPN mode the answer is the same, and carrying out the calculation in a suitable order reduces the
number of keystrokes needed.
Practice Example: Exchanging and Viewing Registers
Two more commands that work with memory registers are "exchange" and "view". Pressing ¹
symbol, and any letter from A through Z can be entered. The value in the chosen register is exchanged with the value
shown on the lower line of the calculator screen.
One use for this is to see what value is stored in a register. For example, the engineer from Example 1 might forget
whether the density of concrete is in register C for Concrete or in register D for Density. Pressing ¹
the value from register C to the lower line of the screen so it can be seen, and pressing ¹
values back as they were. The exchange command is rarely used for this, because the VIEW command, described
below, does the job better. Another use for the exchange command is shown in the example below.
Example 3: In the middle of a calculation, the engineer from Example 1 decides that register D should be used to store
the depth of the foundations of a building. Currently the Area, the height, and the depth of the building are
in registers A, B and C. That means the density of concrete should be taken from D and placed in C, while
the number in C must be placed in D, all without losing the value currently in use shown on the lower line of
the display. How can this be done?
Solution: The engineer first exchanges D with the current value. The current value gets stored in D and the density is
in the current value. Then the density, now in the current value, is exchanged with the depth, in register C.
This puts the density of concrete into register C and the depth into the current value. Finally, exchanging
the depth in the current value with the original value now in D completes the exchange. The keys pressed
are:
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º
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Figure 7
HP 35s Using Calculator memories to Help Solve Problems - Version 1.0
displays the A..Z
will bring
again will put the