The next step is to develop a decision table.

The decision table reflects the rules and the graph and shows the effects for all possible combinations of causes.

Columns list each combination of causes, and each column represents a test case.

A decision table will have a row for each cause and each effect.

A decision table for our simple example where

C$1,$ C$2$ represent the causes,

E$1,$ E$2,$ E$3$ the effects,

columns T$1,$ T$2,$ T$3$ the test cases.

Entries in the table can be represented by

a $1$ for a cause or effect that is

present,

a $0$ represents the absence of a cause

or effect,

a $$ indicates a $$don$$t care$$ value

The input conditions or causes are:

C$1$: Positive integer from $1$ to $80$

C$2$: Character to search for in the string

The output conditions or effects are:

E$1$: Integer out of range

E$2$: Position of character in the string

E$3$: Character not found

The rules or relationships can be

described as follows:

If C$1$ and C$2,$ then E$2.$

If C$1$ and not C$2,$ then E$3.$

If not C$1,$ then E$1.$