HP 30b Professional h3 4/3 sI I=, Programming Example, Enters program mode. The first program is

Programming Example

The following programming example, and all examples in this chapter, were written with Chain or Algebraic set as the operating mode. Since a program executes the keys exactly as if you were manually pressing them, the current operating mode affects how the program executes. If you normally operate in RPN, verify your operating mode is set to either Chain or Algebraic before proceeding so you can follow along with the examples below.

For more information about setting the operating mode, refer to the section titled, The Mode Menu: Setting Preferences in Chapter 1, Basic Features.

The volume of a sphere is represented by the equation, 4π 3 . We will create a program that -- r

3

can calculate the volume of a sphere without having to retype all the keys each time you wish to calculate the volume of a given sphere. Verify your FIX setting is set for three digits to the right of the decimal point. For more information on the FIX setting, refer to the section titled, The Mode Menu: Setting Preferences in Chapter 1, Basic Features.

Table 13-2

Keys	Display	Description
:E		Enters program mode. The first program is
		selected.

I

Starts editing program 0. Note the counter shows your current position in the program.

:h3*

4/3*

:sI

I=

We have entered a program that takes the currently displayed number, raises it to the 3rd power, and multiplies it by 4/3 of PI.

:(HOLD)

The STOP instruction tells the calculator that the program is ending. Note that to enter that special instruction, you need to press and hold the shift key, then press the

Lkey (STOP) before releasing both keys.

Programming 77