Programmer 7500/MAX_PROGRAMMERS.iso/INFO/MISC/SPE.ZIP/STRUCTUR.PRT

Text File | 1987-06-14 | 14.0 KB | 151 lines

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!                                                                           !

! This is the file >>structur.spe<< from the public domain                  !

! version of »SPE«.                                                         !

!                                                                           !

! This is a structogram for showing the elements of a structogram.          !

!                                                                           !

! There are only a few structuring elements which build a structogram:      !

!                                                                           !

!    Sequence                                                               !

!    Inclusion                                                              !

!    Branch                                                                 !

!    Case                                                                   !

!    Loop                                                                   !

!                                                                           !

! Each of these elements is build of blocks. Each block is a block          !

! or a pseudoblock. A block can be divided with the five basic              !

! elements into smaller blocks. A pseudoblock cannot be further             !

! divided. Look at the following part which shows the blocktypes.           !

! They are explained with words afterwards.                                 !

!                                                                           !
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!                                                                           !

! Sequence                                                                  !
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!                        Statement                                          !

!                        Statement                                          !

!                        Statement                                          !

!                        Statement                                          !
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!                                                                           !

! Loop                                                                      !
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!                        Condition                                          !

!                      (Pseudoblock)                                        !
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!  !                                                                        !

!  !                     Block                                              !

!  !                                                                        !
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!                                                                           !

! Inclusion                                                                 !
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! Upper block                                                               !

!                      (Pseudoblock)                                        !
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!  !                                                                        !

!  !                     Lower block                                        !

!  !                                                                        !
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!                                                                           !
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!                                                                           !

! Branch                                                                    !
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!                        Condition                                          !

!                      (Pseudoblock)                                        !
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!                             !                                             !

!           Yes Block         !            No Block                         !

!                             !                                             !
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!                                                                           !

! Case                                                                      !
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!                Common Part of the Condition                               !

!                      (Pseudoblock)                                        !
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! Case part     ! Case part     !      ! Case part     !                    !

! of the        ! of the        ! .... ! of the        !                    !

! Condition     ! Condition     !      ! Condition     ! Else Block         !

! (Pseudoblock) ! (Pseudoblock) !      ! (Pseudoblock) !                    !
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!               !               !      !               !                    !

! Block         ! Block         ! .... ! Block         !                    !

!               !               !      !               !                    !
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!                                                                           !

! Compound                                                                  !
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!                                                                           !

!                        Block                                              !

!                                                                           !
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!                                                                           !

!                        Block                                              !

!                                                                           !
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!                                                                           !

!                        Block                                              !

!                                                                           !
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!                                                                           !

!                        Block                                              !

!                                                                           !
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!                                                                           !

!                                                                           !

! Compound:                                                                 !

!                                                                           !

! The edges of the great block which surround the whole structogram is      !

! an example for a compound. The compound is the most simple                !

! structure element. A compound is a block containing blocks.               !

! The blocks are worked through from the first to the last element          !

! in the block.                                                             !

!                                                                           !

! Sequence:                                                                 !

!                                                                           !

! A sequence is a sequence of statements. A compound is a sequence          !

! of blocks.                                                                !

!                                                                           !

!                                                                           !

! Now an inclusion is following.                                            !

!                                                                           !
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!                                                                           !

! The inclusion consists of a great block and a smaller block in it         !

! with a common edge on the right side. We take all the other               !

! elements into the smaller block of the inclusion.                         !

!                                                                           !
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!  !                                                                        !

!  ! The inclusion can be used for the declaration of procedures,           !

!  ! variables, constants ... in Pascal                                     !

!  ! and for writing subroutines in Basic.                                  !

!  ! The usage of an inclusion varies from language to language.            !

!  !                                                                        !

!  ! Now a branch is following.                                             !

!  !                                                                        !
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!  !                                                                        !

!  ! A branch consists of three blocks. Two blocks side by side and         !

!  ! the third on top of the two others. We are now in the block on         !

!  ! top.                                                                   !

!  !                                                                        !

!  ! The branch is used for formulating control statements like             !

!  ! the if-statement.                                                      !

!  ! The condition of an if has to be written into this block.              !

!  ! The left of the two lower blocks will be executed if                   !

!  ! the condition is true. The lower right block will be                   !

!  ! executed if the condition is false.                                    !

!  !                                                                        !

!  ! We take all the following elements into the right lower block.         !

!  !                                                                        !
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!  !            !                                                           !

!  ! This block ! This block will be executed if the condition is false.    !

!  ! will be    !                                                           !

!  ! executed   ! A case is now following.                                  !

!  ! if the     !                                                           !
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!  ! condition  !                                                           !

!  ! is true.   ! A case is build upon a branch. You can extend a branch    !

!  !            ! to a case. Put the cursor into one of the lower blocks    !

!  !            ! of a branch and choose the command case. There will       !

!  !            ! be build some other blocks. Please look at the            !

!  !            ! examples how the case is used and the blocks are          !

!  !            ! filled with text.                                         !

!  !            !                                                           !

!  !            ! The lower right block of a case is the else-block.        !

!  !            ! We take a loop in it.                                     !

!  !            !                                                           !
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!  !            !  !  !  !                                                  !
                __________

!  !            !  !  !  !  A loop consists of two blocks with two common   !

!  !            !  !  !  !  edges: the lower and the right egde are common. !

!  !            !  !  !  !                                                  !

!  !            !  !  !  !  The condition for executing the lower block     !

!  !            !  !  !  !  will be placed in this block.                   !

!  !            !  !  !  !                                                  !

!  !            !  !  !  !  You can also formulate a for-statement here.    !

!  !            !  !  !  !                                                  !
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!  !            !  !  !  !  !                                               !

!  !            !  !  !  !  ! This block will be executed as long as the    !

!  !            !  !  !  !  ! condition is true or the for-statement is     !

!  !            !  !  !  !  ! active.                                       !

!  !            !  !  !  !  !                                               !
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!                                                                           !
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01.07.1987    01.07.1987   0001000F