Decision Table Languages and Systems by John R. Metzner, Robert L. Ashenhurst, Bruce H. Barnes

By John R. Metzner, Robert L. Ashenhurst, Bruce H. Barnes

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IF BOTH FILES CONTAIN A RECORD HAVING THE SAME KEY VALUE IN POSITIONS 73-80, THEN THE ONE FROM "OLD" IS DISCARDED AND THE ONE FROM "MOD" APPEARS IN THE RESULT FILE, "NEW". ALL OTHER RECORDS ARE MERGED INTO "NEW" IN KEY VALUE ORDER. 2 Update-merge program in PL/I. 30 2. SEMIOTICS major obstacles to wider decision table use: the use of decision tables in programming calls for a different style in program synthesis. At first, decision tables seem to call for a "bottom-up" programming style in which attention is initially upon the details of the determination and treatment of each case.

If this yields any rules having no tests, they are removed, and the resulting table may be processed. This feature preserves both the logical checking desirable for complex tables and the production of no unnecessary condition tests. It is partially implemented in DETAP which uses $ and * for implied true and false, respectively. An implied condition value feature can also be used to improve the efficiency of procedures automatically produced from decision tables. If a condition has been tested and found to hold, then the rules containing an implied or explicit negation of that condition cannot be selected and need not be considered further.

6. 4 AX (,BQ(CZ,£D)RS, ( G O , V,(YRN,APT), )EM)G1# Sample input and corresponding results for FIELD-FINDER. 5 Operation of NEXT-ITEM. 35 36 2. 6 NEXT-ITEM decision table—limited entry form. X X IDENTIFICATION DIVISION. ". PICTURE 999 USAGE COMP. 01 NCH MOVE 1 TO FLAG TOP. MOVE BLANKS TO· TINIT. MOVE 0 TO TLGTH FLAG. MOVE 0 TO NUMBR ERROR. MOVE 1 TO NCH TLEVEL. 7 GO TO NEXT-ITEM MOVE 3 TO STATE MOVE 4 TO STATE MOVE 2 TO STATE MOVE 1 TO STATE ADD 1 TO NCH MOVE 3 TO FLAG MOVE 2 TO FLAG INITIALIZE.

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