HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 685)

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Example 3

– tagging input and output from function p(V,T)

In this example we modify the program @@@p@@@ so that the output tagged input

values and tagged result. Use ‚@@@p@@@ to recall the contents of the program

to the stack:

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

INPUT OBJ→ → V T n ‘(8.31451_J/(K*mol))*(n*T/V)‘ »

Modify it to read:

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

INPUT OBJ→ → V T n

« V T n

‘(8.31451_J/(K*mol))*(n*T/V)‘ EVAL “p” →TAG » »

Note: Notice that we have placed the calculation and tagging of the function

p(V,T,n), preceded by a recall of the input variables V T n, into a sub-program

[the sequence of instructions contained within the inner set of program

symbols « » ]. This is necessary because without the program symbol

separating the two listings of input variables (V T N « V T n), the program

will assume that the input command

→ V T N V T n

requires six input values, while only three are available. The result would

have been the generation of an error message and the interruption of the

program execution.

To include the subprogram mentioned above in the modified definition of

program @@@p@@@, will require you to use ‚å at the beginning and end of

the sub-program. Because the program symbols occur in pairs, whenever

‚å is invoked, you will need to erase the closing program symbol (») at

the beginning, and the opening program symbol («) at the end, of the sub-

program.

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