Intel® Fortran Compiler XE 13.1 User and Reference Guides

CYCLE

Statement: Interrupts the current execution cycle of the innermost (or named) DO construct.

CYCLE [name]

name

(Optional) Is the name of the DO construct.

Description

When a CYCLE statement is executed, the following occurs:

  1. The current execution cycle of the named (or innermost) DO construct is terminated.

    If a DO construct name is specified, the CYCLE statement must be within the range of that construct.

  2. The iteration count (if any) is decremented by 1.

  3. The DO variable (if any) is incremented by the value of the increment parameter (if any).

  4. A new iteration cycle of the DO construct begins.

Any executable statements following the CYCLE statement (including a labeled terminal statement) are not executed.

A CYCLE statement can be labeled, but it cannot be used to terminate a DO construct.

Execution of a CYCLE statement that belongs to a DO CONCURRENT construct completes execution of that iteration of the construct.

Example

The following example shows a CYCLE statement:

DO I =1, 10
  A(I) = C + D(I)
  IF (D(I) < 0) CYCLE    ! If true, the next statement is omitted
  A(I) = 0               ! from the loop and the loop is tested again.
END DO

The following shows another example:

      sample_loop: do i = 1, 5
           print *,i
             if( i .gt. 3 ) cycle sample_loop
           print *,i
           end do sample_loop
           print *,'done!'
!output:
!     1
!     1
!     2
!     2
!     3
!     3
!     4
!     5
!     done!

See Also


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