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Another fundamental requirement is that of repetition. If the
number of cycles is known in advance then the DO statement
should be used. This also controls a block of statements known as
the DO-loop. A CONTINUE statement usually marks the end of
a DO-loop.
Fortran has no direct equivalent of the ``do while" and ``repeat
until" forms available in some program languages for loops of an
indefinite number of iterations, but they can be constructed using
simple GO TO and IF statements.
Helen Rowlands
8/27/1998