HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 675
Enter a, b and c, 2 0} V }, INPUT OBJ, T, and n, V T n, 31451_J/K*mol*n*T/V
UPC - 829160013183
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Store the new program back into variable @@@p@@@. Press @@@p@@@ to run the program. Enter values of V = 0.01_m^3 and T = 300_K in the input string, then press `. The result is 49887.06_J/m^3. The units of J/m^3 are equivalent to Pascals (Pa), the preferred pressure unit in the S.I. system. Note: because we deliberately included units in the function definition, the input values must have units attach to them in input to produce the proper result. Input string program for three input values The input string program for three input values, say a ,b, and c, looks as follows: « "Enter a, b and c: " {" :a: :b: :c: " {2 0} V } INPUT OBJ→ » This program can be easily created by modifying the contents of INPT2 to make it look like shown immediately above. The resulting program can then be stored in a variable called INPT3. With this program we complete the collection of input string programs that will allow us to enter one, two, or three data values. Keep these programs as a reference and copy and modify them to fulfill the requirements of new programs you write. Application: evaluating a function of three variables Suppose that we want to program the ideal gas law including the number of moles, n, as an additional variable, i.e., we want to define the function p(V ,T , n) = (8.31451_ J ) n ⋅T , KV and modify it to include the three-variable input string. The procedure to put together this function is very similar to that used earlier in defining the function p(V,T). The resulting program will look like this: « "Enter V, T, and n:" {" :V: :T: :n:" {2 0} V } INPUT OBJ→ → V T n '(8.31451_J/(K*mol))*(n*T/V) ' » Store this result back into the variable @@@p@@@.To run the program, press @@@p@@@. Page 21-26
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