HP 35s HP 35s scientific calculator - User Guide - Page 194

Ø (hold) (release) Ø (hold) (release) Ø (hold) (release) Value of π. 25π. End of program. Result is correct. Entering and Displaying Data The calculator's variables are used to store data input, intermediate results, and final results. (Variables, as explained in chapter 3, are identified by a letter from A through Z, but the variable names have nothing to do with program labels.) In a program, you can get data in these ways: From an INPUT instruction, which prompts for the value of a variable. (This is the most handy technique.) From the stack. (You can use STO to store the value in a variable for later use.) From variables that already have values stored. From automatic equation prompting (if enabled by flag 11 set). (This is also handy if you're using equations.) In a program, you can display information in these ways: With a VIEW instruction, which shows the name and value of a variable. (This is the most handy technique.) On the stack - only the values in the X and Y registers are visible. (You can use PSE for a 1-second look at the X and Y registers.) In a displayed equation (if enabled by flag 10 set). (The "equation" is usually a message, not a true equation.) Some of these input and output techniques are described in the following topics. 13-12 Simple Programming