HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 618)

100

101

FOR k FROM 1 TO n DO

ROLLDIE(sides)+ROLLDIE(sides) ▶ roll;

L2(roll)+1 ▶ L2(roll);

END;

By omitting the EXPORT command when a function is declared, its visibility can be restricted to the program

within which it is

dened. For example, you could dene the ROLLDIE function inside the ROLLMANY

program like this:

ROLLDIE();

EXPORT ROLLMANY(n,sides)

BEGIN

LOCAL k,roll;

// initialize list of frequencies

MAKELIST(0,X,1,2*sides,1) ▶ L2;

FOR k FROM 1 TO n DO

ROLLDIE(sides)+ROLLDIE(sides) ▶ roll;

L2(roll)+1 ▶ L2(roll);

END;

ROLLDIE(n)

BEGIN

RETURN 1+RANDINT(n-1);

END;

In the second version of the ROLLMANY program, there is no ROLLDIE function exported from another

program. Instead, ROLLDIE is visible only to ROLLMANY. The ROLLDIE function must be declared before it is

called. The

rst line of the program above contains the declaration of the ROLLDIE function. The denition

of the ROLLDIE function is located at the end of the program.

Finally, the list of results could be returned as the result of calling ROLLMANY instead of being stored directly

in the global list variable, L2. This way, if the user wanted to store the results elsewhere, it could be done

easily.

ROLLDIE();

EXPORT ROLLMANY(n,sides)

BEGIN

LOCAL k,roll,results;

// initialize list of frequencies

MAKELIST(0,X,1,2*sides,1) ▶ results;

570 Chapter 28 Programming in HP PPL

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