HP 40gs, User Manual, Page: 179 / 444

Using mathematical functions 13-25
Program constants
The program constants are numbers that have been
assigned to various calculator settings to enable you to
test for or specify such a setting in a program. For
example, the various display formats are assigned the
following numbers:
1 Standard
2 Fixed
3 Scientific
4 Engineering
5 Fraction
6 Mixed fraction
In a program, you could store the constant number of a
particular format into a variable and then subsequently
test for that particular format.
To access the menu of program constants:
1. Press .
2. Press .
3. Use the arrow keys to navigate through the options.
4. Click and then to display the number
assigned to the option you selected in the previous
step.
The use of program constants is illustrated in more detail
in “Programming” on page 21-1
Physical constants
There are 29 physical constants—from the fields of
chemistry, physics and quantum mechanics—that you
can use in calculations. A list of all these constants can be
found in “Physical Constants” on page R-16.
To access the menu of physical constants:
1. Press .
2. Press .
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