181 lines
6.5 KiB
COBOL
181 lines
6.5 KiB
COBOL
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IDENTIFICATION DIVISION.
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PROGRAM-ID. CENTER.
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SECURITY.
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THIS PROGRAM CENTERS, LEFT ALIGNS, OR RIGHT ALIGNS
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A HEADING WITHIN AN 80 CHARACTER FIELD. IT CAN BE MADE
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INTO A GENERAL-PURPOSE SUBROUTINE BY MOVING THE BLOCK OF
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STORAGE CALLED PARAMETER-AREA INTO THE LINKAGE SECTION,
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ADDING THE CLAUSE, "USING PARAMETER-AREA" TO THE PROCEDURE
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DIVISION HEADER, REPLACING "STOP RUN" WITH "EXIT PROGRAM",
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AND DELETING THE DISPLAY AND ACCEPT STATEMENTS. THE
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PARAMETER-AREA VARIABLES WOULD THEN BE SET UP IN THE
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CALLING PROGRAM.
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*
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ENVIRONMENT DIVISION.
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DATA DIVISION.
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WORKING-STORAGE SECTION.
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01 WORK-FIELDS.
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05 IIX PIC S9(5) VALUE 0 COMP-0.
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05 WS-IN-START PIC S9(5) VALUE 0 COMP-0.
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05 WS-IN-END PIC S9(5) VALUE 0 COMP-0.
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05 WS-IN-LEN PIC S9(5) VALUE 0 COMP-0.
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05 WS-OUT-INDEX PIC S9(5) VALUE 0 COMP-0.
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05 TEN-SPACES PIC X(10) VALUE SPACES.
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01 SWITCHES.
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05 ON-VALUE PIC X VALUE 'Y'.
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05 OFF-VALUE PIC X VALUE 'N'.
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05 FINISHED-SW PIC X VALUE 'N'.
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88 FINISHED VALUE 'Y'.
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01 WS-RULERS.
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05 WS-RULER-1.
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10 FILLER PIC X(40) VALUE
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" 1 2 3 4".
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10 FILLER PIC X(40) VALUE
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" 5 6 7 8".
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05 WS-RULER-2.
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10 FILLER PIC X(40) VALUE
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"1234567890123456789012345678901234567890".
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10 FILLER PIC X(40) VALUE
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"1234567890123456789012345678901234567890".
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01 PARAMETER-AREA.
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05 PA-OPTION PIC X VALUE SPACE.
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88 CENTER-OPTION VALUE 'C', 'c'.
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88 LEFT-ALIGN-OPTION VALUE 'L', 'l'.
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88 RIGHT-ALIGN-OPTION VALUE 'R', 'r'.
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88 VALID-OPTION VALUE 'C', 'c', 'L', 'l',
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'R', 'r'.
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88 END-OPTION VALUE 'E', 'e'.
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05 PA-BUFFER-LEN PIC S9(5) VALUE 80 COMP-0.
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05 PA-IN-TITLE PIC X(80) VALUE SPACES.
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05 FILLER REDEFINES PA-IN-TITLE.
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10 PA-IN-TITLE-CHAR OCCURS 80 TIMES PIC X.
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05 PA-OUT-TITLE PIC X(80) VALUE SPACES.
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05 FILLER REDEFINES PA-OUT-TITLE.
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10 PA-OUT-TITLE-CHAR OCCURS 80 TIMES PIC X.
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PROCEDURE DIVISION.
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P000-MAIN-LINE.
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DISPLAY SPACE.
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DISPLAY SPACE.
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DISPLAY TEN-SPACES,
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" This is program CENTER, one of the MS-COBOL demonstration".
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DISPLAY TEN-SPACES,
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" programs. It will center, left align, or right align".
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DISPLAY TEN-SPACES,
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" a line of text up to 80 characters long. You will be ".
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DISPLAY TEN-SPACES,
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" asked whether you want to center or align your text, ".
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DISPLAY TEN-SPACES,
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" then asked to enter your text, which will be displayed".
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DISPLAY TEN-SPACES,
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" as requested.".
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DISPLAY SPACE.
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DISPLAY TEN-SPACES,
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" This action will be repeated until you enter".
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DISPLAY TEN-SPACES,
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" option E to end the program.".
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DISPLAY SPACE.
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DISPLAY TEN-SPACES,
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" This is a simple program, but it may be made into a".
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DISPLAY TEN-SPACES,
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" subroutine that can be called to center or align report".
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DISPLAY TEN-SPACES,
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" or screen headings.".
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DISPLAY SPACE.
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DISPLAY SPACE.
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PERFORM P010-GET-OPTION
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UNTIL FINISHED.
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STOP RUN.
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P010-GET-OPTION.
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DISPLAY
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" Please type first letter of option desired, then hit",
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" RETURN:".
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DISPLAY
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" Option C: Center text on screen".
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DISPLAY
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" Option L: Left align text on screen".
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DISPLAY
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" Option R: Right align text on screen".
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DISPLAY
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" Option E: End this program".
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DISPLAY SPACE.
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ACCEPT PA-OPTION.
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IF END-OPTION
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MOVE ON-VALUE TO FINISHED-SW
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ELSE IF VALID-OPTION
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PERFORM P020-GET-TITLE.
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P020-GET-TITLE.
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DISPLAY
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" Please enter text (1 to 80 characters) below:".
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DISPLAY SPACE.
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MOVE SPACES TO PA-OUT-TITLE.
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ACCEPT PA-IN-TITLE.
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IF PA-IN-TITLE NOT = SPACES
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PERFORM P030-ADJUST.
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DISPLAY
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"Centered/aligned text:".
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DISPLAY WS-RULER-1.
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DISPLAY WS-RULER-2.
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DISPLAY PA-OUT-TITLE.
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P030-ADJUST.
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PERFORM P035-NOTHING VARYING WS-IN-START
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FROM 1 BY 1
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UNTIL PA-IN-TITLE-CHAR (WS-IN-START) NOT = SPACE
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OR WS-IN-START > PA-BUFFER-LEN.
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PERFORM P035-NOTHING VARYING WS-IN-END
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FROM PA-BUFFER-LEN BY -1
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UNTIL PA-IN-TITLE-CHAR (WS-IN-END) NOT = SPACE
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OR WS-IN-END NOT > 1.
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IF LEFT-ALIGN-OPTION
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MOVE 1 TO WS-OUT-INDEX
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ELSE
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COMPUTE WS-IN-LEN =
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WS-IN-END - WS-IN-START + 1
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IF RIGHT-ALIGN-OPTION
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COMPUTE WS-OUT-INDEX =
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1 + (PA-BUFFER-LEN - WS-IN-LEN)
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ELSE
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* *** MUST BE CENTER OPTION ******
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COMPUTE WS-OUT-INDEX =
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1 + ((PA-BUFFER-LEN - WS-IN-LEN) / 2).
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PERFORM P040-MOVE-TITLE VARYING IIX FROM WS-IN-START
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BY 1 UNTIL IIX > WS-IN-END.
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P035-NOTHING.
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EXIT.
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P040-MOVE-TITLE.
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MOVE PA-IN-TITLE-CHAR (IIX)
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TO PA-OUT-TITLE-CHAR (WS-OUT-INDEX).
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ADD 1 TO WS-OUT-INDEX.
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