ここで、iterator-id 段落 GetEven を使用して、m-FibonacciArray に偶数を戻します。
class-id Fibonacci.Class1 static. data division. working-storage section. 01 m-FibonacciArray binary-long occurs any static. method-id FibEvens static. procedure division. set content of m-FibonacciArray to (1 2 3 5 8 13 21 34 55 89 144) display "Even numbers in the Fibonacci sequence:" perform varying evenNumber as binary-long through self::GetEven display evenNumber end-perform goback. end method. iterator-id GetEven yielding res as binary-long static. perform varying i as binary-long through m-FibonacciArray if i b-and 1 = 0 set res to i goback end-if end-perform stop iterator *> stops the iterator explicitly end iterator. *> end of method stops the iterator implicitly end class.
以下は同様の例ですが、self 構文を使用して現在のクラス (反復子があるクラス) から直接反復できるようにしたものです。
class-id Fibonacci.Class2.
method-id main static (args as string occurs any).
try
declare max as binary-long = binary-long::Parse(args[0])
declare fibs = new Fibonacci(max)
perform varying i as binary-long through fibs
display i
end-perform
catch
display "Bad command line"
end-try
end method.
end class.
class-id Fibonacci.
01 MaxNumber binary-long.
method-id new (#max as binary-long).
set MaxNumber to #max
end method.
iterator-id self yielding res as binary-long.
set res to 1
exit iterator
declare frst as binary-long = 0
declare second as binary-long = 1
perform until exit
compute res = frst + second
if res > MaxNumber
stop iterator
end-if
move second to frst
move res to second
exit iterator
end-perform
end iterator.
end class.
反復子のサンプルも参照してください。このサンプルは、Start > All Programs > Micro Focus Enterprise Developer > Samples > Visual COBOL Samples の [COBOL for .NET]. に用意されています。