The CKOPEN procedure requires two parameters: one is a table that identifies the file and specifies the type of access; the other is a two-byte item to which the status of the call is returned. When calling this procedure from a FORTRAN program, the filetable parameter must be defined as an eight-word array containing both integer and character values.
Any item that is defined as COMPUTATIONAL or COMP in a COBOL program is declared as an INTEGER in a FORTRAN program when it contains four bytes or less. Thus, the following are equivalent:
02 FILENUM PIC S9(4) COMP. <---------------------- COBOL description
INTEGER FILENUM <--------------------------------- FORTRAN description
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Any data items defined with a picture of X in COBOL would be declared as CHARACTER items in FORTRAN. Thus, the following are equivalent:
02 FILENAME PIC X(8). <------------------------- COBOL description
CHARACTER *8 FILENAME <---------------------- FORTRAN description
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Assuming that file FEXAMFIL has been created by the >BUILD command, the FORTRAN statements in Figure 5-2 “Opening KSAM File with CKOPEN” open that file for output only and sequential access.
Figure 5-2 Opening KSAM File with CKOPEN
INTEGER FILETABLE(8)
CHARACTER FILETABLC(16)
INTEGER FILENUM
CHARACTER*8 FILENAME
CHARACTER*2 FSTAT
INTEGER IOTYPE
INTEGER AMODE
INTEGER PREVOP
EQUIVALENCE (IFSTAT,FSTAT)
EQUIVALENCE (FILETABLE,FILETABLC,FILENUM)
EQUIVALENCE (FILETABLC(3),FILENAME)
EQUIVALENCE (FILETABLE(6),IOTYPE)
EQUIVALENCE (FILETABLE(7),AMODE)
EQUIVALENCE (FILETABLE(8),PREVOP)
DATA FILENAME/"FEXAMFIL"/,PREVOP/0/
C**********************************************************************
C OPEN KSAM FILE FOR SEQUENTIAL INPUT *
C**********************************************************************
IOTYPE=1 I/O type is output only
AMODE=0 access mode is sequential
CALL CKOPEN(FILETABLE,IFSTAT)
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