HP 48gII Graphing Calculator Uživatelský manuál stáhnout pdf (Strana 708)

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101

Page 21-59

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

command.

The FOR construct

As in the case of the START command, the FOR command has two variations:

the FOR…NEXT construct, for loop index increments of 1, and the FOR…STEP

construct, for loop index increments selected by the user. Unlike the START

command, however, the FOR command does require that we provide a name

for the loop index (e.g., j, k, n). We need not to worry about incrementing

the index ourselves, as done in the examples using START. The value

corresponding to the index is available for calculations.

Commands involved in the FOR construct are available through:

„°@)@BRCH@ @)@FOR

Within the BRCH menu („°@)@BRCH@) the following keystrokes are available

to generate FOR constructs (the symbol  indicates cursor position):

• „ @)@FOR: Starts the FOR…NEXT construct: FOR  NEXT

• ‚ @)@FOR: Starts the FOR…STEP construct: FOR  STEP

The FOR…NEXT construct

The general form of this statement is:

start_value end_value FOR loop_index program_statements

To avoid an infinite loop, make sure that start_value < end_value.

Example – calculate the summation S using a FOR…NEXT construct

The following program calculates the summation

∑

1 2 ... 703 704 705 706 707 708 709 710 711 712 713 ... 863 864

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