Hp 48g Graphing Calculator Manual de usuario descargar pdf (Pagina 416)

100

101

Using Programming Structures

A programming structure allows a program to make a decision about

how it should execute depending on given conditions or the values of

particular arguments. Careful use of these structures make it possible

to create programs of extraordinary flexibility.

Conditional Structures

Conditional structures let a program make a decision based on the

result of one or more tests.

Here is a summary of the conditional structures available on the

HP 48:

IF...THEN...END

Enter this structure into a program by pressing

fPRG) BFlCH IF . Its syntax is:

■s ... IF test-clause THEN true-clause END ... :*■

IF...THEN...END executes the sequence of commands in the

true-clause only if the test-clause evaluates to true. The test-clause

can be a command sequence (for example, fl B fi) or an algebraic (for

example, ' flilB ‘), If the test-clause is an algebraic, it’s automatically

evaluated to a number—you don’t need ^NUM or EVAL.

IF begins the test-clause, which leaves a test result on the stack.

THEN removes the test result from the stack. If the value is nonzero,

the true-clause is executed—otherwise, program execution resumes

following END.

IF...THEN...ELSE...END

Enter this structure into a program by pressing

(PRG) BRCH O IF . Its syntax is:

■ K ... IF test-clause

THEN true-clause ELSE false-clause END’ ... :*■

IF...THEN...ELSE...END executes either the true-clause sequence of

commands if the test-clause is true, or the false-clause sequence of

commands if the test-clause is false. If the test-clause is an algebraic.

29-10 Programming the HP 48

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Hp 48g Graphing Calculator Manual de usuario Pagina 416

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