Pressing Dperforms a swap. A swap operation exchanges the numbers on Levels 1 and 2

of the stack. The Dkey has a small symbol to the right of the parenthesis symbol to indicate the swap feature. With the numbers entered into the stack shown in the left column in Figure 7,

pressing Dperforms a swap to the stack as shown in the right column.

-15

12

41

23

-15

-15

23

41

Figure 7 The RPN Stack and the Swap Operation

NOTE: when no menu is selected, the <key performs the same function as the (key. The >key performs the inverse operation called, roll up.

One-Number Functions and the Math Menu

The key presses for the one-number mathematical functions listed in Table 2-4 below apply to all modes, Chain, Algebraic, and RPN. To execute one-number functions, with a number displayed, press the key or key combination corresponding to the operation you wish to execute. The result is displayed on the bottom line.

For example, to calculate 6 , press 6:n. The result of 2.45 is calculated

immediately and displayed on the bottom line. Note the square root symbol appears on the top line.

NOTE: before doing any trigonometric calculations in the Math menu, check whether the angle mode is set for degrees (Degree) or radians (Radian). You will need to change the setting if the active mode is not what your problem requires. For more information on the Mode menu and calculator settings, refer to the section titled, The Mode Menu: Setting Preferences in Chapter 1. Table 2-4lists one-number functions along with their corresponding keys.

18 Mathematical Calculations

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HP 20b Consultant Financial, 30b Professional One-Number Functions and the Math Menu, RPN Stack and the Swap Operation
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30b Professional, 20b Consultant Financial specifications

The HP 30b Professional calculator is a versatile tool designed specifically for business professionals, engineers, and educators. This reliable calculator merges advanced technologies with user-friendly features, enabling users to perform complex calculations with ease. The HP 30b is appreciated for its robust design and functionality, making it a top choice among those who require a dependable calculating device for various applications.

One of the standout features of the HP 30b is its capability to handle both RPN (Reverse Polish Notation) and algebraic entry modes. This flexibility allows users to choose the input method that best suits their preferences, enhancing productivity and minimizing calculation errors. The calculator also boasts a large, high-resolution display that ensures clarity when navigating through calculations and results.

The HP 30b comes equipped with essential business functions that include financial calculations, cash flow analysis, and statistical functions, all of which are invaluable in professional settings. Users can seamlessly compute interest rates, perform amortization schedules, and evaluate loan payments, making it an indispensable asset for finance-oriented individuals.

Another key characteristic is its programmable functionality. The HP 30b allows users to create custom programs tailored to specific tasks, which can save time and reduce manual entry errors. This programmable capability is especially beneficial for repetitive calculations, providing a significant efficiency boost in ambiguous or multi-step operations.

The durable construction of the HP 30b ensures longevity while the compact design makes it portable and convenient for on-the-go calculations. Additionally, the calculator features an energy-efficient design, which includes a long-lasting battery life, reducing the need for frequent replacements.

With a straightforward key layout and intuitive interface, the HP 30b is designed with user experience in mind. Whether in a classroom, office, or fieldwork scenario, users can easily navigate functions and access the features they need quickly. The HP 30b Professional calculator is truly an impressive blend of technology and practicality, making it an essential tool for anyone needing reliable performance in their daily calculations.
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