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REBOL for COBOL programmers |
| Table of contents Generalities Introduction Reserved words What you may/must say Right-to-left evaluation Programming by side effects Code is data The Global Context Coding REBOL like COBOL IDENTIFICATION DIVISION ENVIRONMENT DIVISION FILE SECTION WORKING-STORAGE SECTION SCREEN SECTION PROCEDURE DIVISION COPY statement Printing Your own mezzanine Module testers Module documentation idea Program structure suggestion List of all code samples Some useful equivalencies ACCEPT ADD COMPUTE DISPLAY DIVIDE EXIT INSPECT MOVE MULTIPLY IF OCCURS PERFORM READ REMAINDER ROUNDED SEARCH SET TODAYS-DATE TIME VALUE What's in your head, Boy? Introduction Similar but not the same Colon is not assignment Be careful defining A shorter letter On punctuation Why so dense? Doing COBOLish things Fixed-format file Sample applications Introduction Source code as corporate asset NACHA list Introduction Global services modules Start writing |
DISPLAY
Date written: March 20, 2013 This page explains some REBOL equivalents of DISPLAY. COBOL DISPLAYThe DISPLAY verb is for low-volume output to some sort of operator display terminal. When COBOL was invented, this probably would have been a typewrite-like device in a sealed computer room. ACCEPT { identifier-1 }
{ literal-1 } ...
Notice the three dots. That means that you can display several
items and they will be strung together. For example,
77 TEST-VAL PIC X(10) VALUE "OFF-LINE" ... DISPLAY "THE VALUE OF TEST-VAL IS " TEST-VAL The REBOL equivalentThe closest REBOL command to DISPLAY is "print." For example: print { identifier-1 }
{ literal-1 }
The identifier-1 can be any word in your program. The literal-1 can
be a literal just like COBOL. If you want to print several things
strung together, the identified-1 can refer to a block.
For example:
TEST-VAL: "OFF-LINE" print ["THE VALUE OF TEST-VAL IS" TEST-VAL] There are other ways to display stuff in REBOL. The "print" function is just the way that is closest to the DISPLAY verb. Other output methods will be shown when appropriate in other examples elsewhere. |