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Md ASGAR (Querist)

14 September 2011 if any one know s how to make flowchart n decesion table plz sent u feed back i hav to appear in nov 2011

C A S.S.Agarwal, M.Com.,LL.B,

C A S.S.Agarwal, M.Com.,LL.B, (Expert)

15 September 2011 Decision tables

This expository paper outlines the essential features in decision table development and illustrates
applications in various fields. A comprehensive bibliography is also presented.
There is at present a growing interest in decision tables
among programming and systems professionals. For
the past several years occasional articles and papers have
been appearing in American magazines and journals
pointing out the value of decision table techniques to the
user and discussing translation to a lower level of
program. This body of literature is reviewed and discussed
below. Little work, as yet, seems to have been
done on this subject in the U.K.
The purpose of this paper is to explain the basic ideas
of the decision table approach, to illustrate its wide
applicability by way of examples, and to present a
bibliography. The use of decision tables in the context
of more comprehensive systems is also mentioned.
The basic ideas
A decision table is a useful tool when the rules for
handling a data record are more complex than a single
simple discriminating test. Usual practice is to record
and analyse this type of situation by means of a flowchart.
This is then used for writing a program made up
of a number of branches. Such programs, even though
written in a high level language, are often not readily
comprehensible in the absence of the accompanying
flowchart or without constructing one.
Consider the flowchart of Fig. 1. This describes the
rules for preparing lists of students divided into five
categories on the basis of end of year exam results and
other information in the case of those who have failed
their main subject. The flowchart is drawn more
formally in Fig. 2. We see that it represents a five way
program branch on the outcome of tests on some of four
distinct conditions. The five different actions may be
thought of simply as program routes. MM and MA
are marks obtained in main and accessory subjects
respectively. C is set positive if special consideration is
recommended and R is set positive if the student wishes
to repeat the course. P is the pass mark.
If asked to program on the basis of Fig. 2 the ALGOL
programmer would write something like:
if MM 0 then go to R2>
else if R > 0 then go to R4
else go to R5)
else if (MA 0 THEN GO TO R3;
ELSE IF R > 0
THEN GO TO R4;
ELSE GO TO R5;
ELSE IF MA < P THEN GO TO R2;
ELSE GO TORI;
The programmer with a decision table feature in his
language would draw up a table similar to Table 1.

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