Hp 49g+ User Manual download pdf (Page 693)

100

101

Page 21-48

and save it under the name ‘f1’. Press J and verify that variable @@@f1@@@ is

indeed available in your variable menu. Verify the following results:

0 @@@f1@@@ Result: 0 1.2 @@@f1@@@ Result: 1.44

3.5 @@@f1@@@ Result: no action 10 @@@f1@@@ Result: no action

These results confirm the correct operation of the IF…THEN…END construct.

The program, as written, calculates the function f

(x) = x

, if x < 3 (and not

output otherwise).

The IF…THEN…ELSE…END construct

The IF…THEN…ELSE…END construct permits two alternative program flow

paths based on the truth value of the logical_statement. The general format of

this construct is:

IF logical_statement THEN program_statements_if_true

ELSE program_statements_if_false END.

The operation of this construct is as follows:

1. Evaluate logical_statement.

2. If logical_statement is true, perform program statements_if_true and

continue program flow after the END statement.

3. If logical_statement is false, perform program statements_if_false and

continue program flow after the END statement.

To produce an IF…THEN…ELSE…END construct directly on the stack, use:

„°@)@BRCH@ ‚ @)@IF@@

This will create the following input in the stack:

Example

: Type in the following program:

1 2 ... 688 689 690 691 692 693 694 695 696 697 698 ... 861 862

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Hp 49g+ User Manual Page 693

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