Conditional Exit Loops

Can set up a non-incremental DO loop which is terminated by simply jumping out of it,

    DO 
     DO
      ...
      IF (a.GT.b) EXIT
      ...
     END DO
     ! if a.GT.b control jumps here
     IF (c.GT.d) EXIT
    END DO
    ! if c.GT.d control jumps here

The EXIT statement tells control to jump out of the current DO loop.

It is not possible to jump into a loop.

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