HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 710)

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• Check out that the program call 0.5 ` 2.5 ` 0.5 ` @GLIS2

produces the list {0.5 1. 1.5 2. 2.5}.

• To see step-by-step operation use the program DBUG for a short list, for

example:

J1 # 1.5 # 0.5 ` Enter parameters 1 1.5 0.5

[‘] @GLIS2 ` Enter the program name in level 1

„°LL @)@RUN@ @@DBG@ Start the debugger.

Use @SST↓@ to step into the program and see the detailed operation of each

command.

The DO construct

The general structure of this command is:

DO program_statements UNTIL logical_statement END

The DO command starts an indefinite loop executing the program_statements

until the logical_statement returns FALSE (0). The logical_statement must

contain the value of an index whose value is changed in the

program_statements.

Example 1

- This program produces a counter in the upper left corner of the

screen that adds 1 in an indefinite loop until a keystroke (press any key) stops

the counter:

« 0 DO DUP 1 DISP 1 + UNTIL KEY END DROP »

Command KEY evaluates to TRUE when a keystroke occurs.

Example 2

– calculate the summation S using a DO…UNTIL…END construct

The following program calculates the summation

∑

Using a DO…UNTIL…END loop:

« 0. → n S « DO n SQ S + ‘S‘ STO n 1 – ‘n‘ STO UNTIL

‘n<0‘ END S “S” →TAG » »

1 2 ... 705 706 707 708 709 710 711 712 713 714 715 ... 863 864

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