HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 179

hp40g+.book Page 25 Friday, December 9, 2005 1:03 AM 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 . Using mathematical functions 13-25