fortran - 程序内 SUBROUTINE 声明中的不可分类语句

Question

所以我用 Fortran 90 编写了一个基本的 Vigenere Cypher，但是当我尝试编译它时，由于我的内部子程序，我遇到了无法分类的语句错误。

我已经在'(' ')' 中列出了每个子程序中使用的变量，但我仍然收到错误。我认为这是一个非常简单的修复，但我似乎找不到解决方案。

这是我的代码:

PROGRAM Assign_8

IMPLICIT NONE


CHARACTER*750 :: Input
CHARACTER*10 :: Key
CHARACTER*750 :: RepeatedKey
CHARACTER*750 :: Encrypted, Decrypted
LOGICAL :: Path
CHARACTER*10 :: Validation
INTEGER :: Reps, Encrypt, Decrypt, KeyInt, InputInt, MergeInt, UnmergeInt

WRITE(*,*) 'Do you wish to Encrypt or Decrypt a file?'

CALL Validation_Sub

SUBROUTINE Validation_Sub(Path, Validation)

IMPLICIT NONE

    READ(*,*) Validation

        SELECT CASE (Validation)

            CASE ('Encrypt' , 'encrypt')
                WRITE(*,*) 'You have selected to Encrypt a file.'
                Path = .TRUE.

            CASE ('Decrypt' , 'decrypt')
                WRITE(*,*) 'You have selected to Decrypt a file.'
                Path = .FALSE.

            CASE DEFAULT
                WRITE(*,*) 'Selection not valid please select to either Encrypt or Decrypt a file.'

                IF (Path .EQV. .TRUE.) THEN

                CALL Encrypt_Sub

                ELSE IF (Path .EQV. .FALSE.) THEN   

                CALL Decrypt_Sub

                END IF
            END SELECT
END SUBROUTINE

SUBROUTINE Encrypt_Sub(Input, Key, RepeatedKey, Encrypt, InputInt, KeyInt, MergeInt, Encrypted)

    IMPLICIT NONE

        OPEN(1,FILE='plaintext.txt')
        READ(1,'(A)') Input

        WRITE(*,*) 'Please Enter a Key Phrase of 10 Characters (Including Spaces and Punctuation)'
        READ(*,*) Key
        RepeatedKey = REPEAT(Key(1:10),75)

        DO Encrypt = 1, LEN_TRIM(Input)
            InputInt = IACHAR(Input(Encrypt:Encrypt))
            KeyInt = IACHAR(RepeatedKey(Encrypt:Encrypt))
            MergeInt = InputInt + (KeyInt - 32)

            IF (MergeInt > 126) THEN
                MergeInt = MergeInt - 94
            END IF

            Encrypted(Encrypt:Encrypt) = ACHAR(MergeInt)

        END DO

        OPEN(2,FILE='EncryptionTest.txt')
        WRITE(2,'(A)') Encrypted
        CLOSE(2)

END SUBROUTINE

SUBROUTINE Decrypt_Sub(Encrypted, Key, RepeatedKey, Decrypt, MergeInt, KeyInt, UnmergeInt, Decrypted)

    IMPLICIT NONE

        OPEN(1,FILE='EncryptionTest.txt')
        READ(1,'(A)') Encrypted
        CLOSE(1)

        WRITE(*,*) 'Please Enter Your Key Phrase'
        READ(*,'(A)') Key
        RepeatedKey = REPEAT(Key(1:10),75)

        DO Decrypt = 1, 750, 1
            MergeInt = IACHAR(Encrypted(Decrypt:Decrypt))
            KeyInt = IACHAR(RepeatedKey(Decrypt:Decrypt))
            UnmergeInt = MergeInt - (KeyInt - 32)

            IF (UnmergeInt < 32) THEN
                UnmergeInt = UnmergeInt + 94
            END IF

            Decrypted(Decrypt:Decrypt) = ACHAR(UnmergeInt)

    END DO      

    OPEN(2,FILE='DecryptionTest.txt')
    WRITE(2,'(A)') Decrypted
    CLOSE(2)

END SUBROUTINE

END PROGRAM Assign_8

我得到的具体错误是:

SUBROUTINE Validation_Sub(Path, Validation)
1

>Unclassifiable Statement at (1)

(间隔)

IMPLICIT NONE
             1

>Unexpected IMPLICIT NONE statement at (1)

我怀疑 IMPLICIT NONE 错误是由于未正确定义 SUBROUTINE 造成的。

END SUBROUTINE
   1

>Expecting END Program statement at (1)

和之前一样，我怀疑这是因为SUBROUTINE没有被定义。

这些错误会重复出现:

SUBROUTINE Encrypt_Sub

&

SUBROUTINE Decrypt_Sub

任何帮助将不胜感激，如果有人发现我的 Vigenere Cypher 代码本身存在任何即时错误，如果您能指出这些错误(如果没有问题的话)，我们将不胜感激。

Answer 1

您在子例程之前缺少 CONTAINS。

将来学习模块，但现在使用 CONTAINS 使这些子例程正确地包含在主程序内部。

应该是这样的

PROGRAM Assign_8
  ...

  CALL Validation_Sub

CONTAINS

  SUBROUTINE Validation_Sub(Path, Validation)
  END SUBROUTINE

  ...

END PROGRAM Assign_8