Manipulating Data Using Methods - Java Programming: Comprehensive Concepts and Techniques - page 135

Figure 3-5a shows the pseudocode that represents the logic of the program
requirements. The structure of the program will be sequential in nature, mean-
ing that the computer will perform one action after another without skipping
any steps or making any decisions that would affect the flow of the logic.
Figure 3-5b shows an event diagram that illustrates how the click of the
Calculate button in the applet window triggers the calculation and displays the
answer in the applet window.

Calculate Body Mass Index

get height from user

get weight from user

convert height and weight to metric

calculate index

display index

End

(a)

trigger

User clicks Calculate
button

operation

System receives request Answers are stored Answers are stored Answer is stored

Calculate body
mass index

Get height and
weight input
from user

Convert inches
and pounds to
meters and
kilograms

Display
results

event

Calculate button
receives the focus

operation triggers
no subsequent
event

(b)

FIGURE 3-5

VALIDATE DESIGN Once you have designed the program, you can validate
the design by stepping through the requirements document and making sure
that the design addresses each requirement. If possible, you also should step
through the solution with test data to verify that the solution meets the require-
ments. The user also should review the design to confirm that it solves the prob-
lem outlined in the requirements. By comparing the program design with the
original requirements, both the programmer and the user can validate that the
solution is correct and satisfactory.