HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 635)

100

101

Sets variable var to start, and for as long as this variable is more than or equal to nish, executes the

sequence of commands, and then subtracts increment from var.

WHILE

Syntax: WHILE test DO commands END;

Evaluates test. If result is true (not 0), executes the commands, and repeats.

Example: A perfect number is one that is equal to the sum of all its proper divisors. For example, 6 is a perfect

number because 6 = 1+2+3. The example below returns true when its argument is a perfect number.

EXPORT ISPERFECT(n)

BEGIN

LOCAL d, sum;

2 ▶ d;

1 ▶ sum;

WHILE sum <= n AND d < n DO

IF irem(n,d)==0 THEN sum+d ▶ sum;

END;

d+1 ▶ d;

END;

RETURN sum==n;

END;

The following program displays all the perfect numbers up to 1000:

EXPORT PERFECTNUMS()

BEGIN

LOCAL k;

FOR k FROM 2 TO 1000 DO

IF ISPERFECT(k) THEN

MSGBOX(k+" is perfect, press OK");

END;

REPEAT

Syntax: REPEAT commands UNTIL test;

Repeats the sequence of commands until test is true (not 0).

The example below prompts for a positive value for SIDES, modifying an earlier program in this chapter:

EXPORT SIDES;

Program commands 587

1 2 ... 630 631 632 633 634 635 636 637 638 639 640 ... 700 701

Komentarze do niniejszej Instrukcji

Brak uwag

HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Strona 635

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Oprogramowanie HP Prime Graphing Wireless Calculator