Hp 49g+ User Manual download pdf (Page 670)

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stack level 7 to give a title to the input string, and leave stack level 6 empty to

facilitate reading the display, we have only stack levels 1 through 5 to define

input variables.

Input string program for two input values

The input string program for two input values, say a and b, looks as follows:

« “Enter a and b: “ {“:a::b: “ {2 0} V } INPUT OBJ→ »

This program can be easily created by modifying the contents of INPTa. Store

this program into variable INPT2.

Application

: evaluating a function of two variables

Consider the ideal gas law,

pV = nRT, where p = gas pressure (Pa), V = gas

volume(m

), n = number of moles (gmol), R = universal gas constant =

8.31451_J/(gmol*K), and T = absolute temperature (K).

We can define the pressure p as a function of two variables, V and T, as

p(V,T) = nRT/V for a given mass of gas since n will also remain constant.

Assume that n = 0.2 gmol, then the function to program is

TVp ⋅=⋅⋅= )_662902.1(2.031451.8),(

We can define the function by typing the following program

« → V T ‘(1.662902_J/K)*(T/V)’ »

and storing it into variable @@@p@@@.

The next step is to add the input string that will prompt the user for the values

of V and T. To create this input stream, modify the program in @@@p@@@ to read:

« “Enter V and T: “ {“ :V: :T: “ {2 0} V }

INPUT OBJ→ → V T ‘(1.662902_J/K)*(T/V)’ »

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Hp 49g+ User Manual Page 670

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