The document discusses the case logic structure, which contains sets of instructions that will be executed based on the value of a variable. It includes: 1) The structure uses a CASE statement to check the value of a variable against constants, and execute the corresponding instructions for that constant. 2) A flowchart shows the logic flow from the CASE statement to checking the variable against each constant. 3) Additional details are provided on representing the constants in the structure with codes.

1. Data Structures and Algorithms
The Case Logic
Structure
@ The case logic structure is made up of several or
many sets of instructions, only one of which will
be selected by the user and executed by the
programmer.
@ The form of the case logic structure is the
following:
CASE OF VARIABLE
= constant 1:
actions for VARIABLE = constant 1
= constant 2:
actions for VARIABLE = constant 2
= constant 3:
actions for VARIABLE = constant 3
.
.
OTHERWISE
actions for VARIABLE = anything
else
END-OF-CASE
Problem Solving with the Case Logic Structure *Property of STI
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2. Data Structures and Algorithms
The Case Logic
Structure
Flowchart Diagram for the Case Logic Structure
A
CASE OF
VARIABLE
= Constant 1 = Constant 2 = Constant 3 OTHERWISE
INSTRUCTIONS INSTRUCTIONS INSTRUCTIONS INSTRUCTIONS
B
Problem Solving with the Case Logic Structure *Property of STI
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3. Data Structures and Algorithms
The Case Logic
Structure
A
C1 = Constant 1
F T
C2 = Constant 2 IF V = C1
C3 = Constant 3
F T
IF V = C2
C4 = Constant 4 INSTRUCTIONS
FOR v = C1
F T
IF V = C3
INSTRUCTIONS
FOR v = C2
F T
IF V = C4
INSTRUCTIONS
FOR v = C3
INSTRUCTIONS INSTRUCTIONS
FOR v = C4 FOR v = C4
Codes B
@ Codes are characters, character strings, numbers, or
some combination of these types of data that a
programmer uses to name the options, the constants
in a case structure.
Problem Solving with the Case Logic Structure *Property of STI
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