Programming and Problem Solving with Java

CASE STUDY

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Here is a sample output from running the program:

Here is another sample run:

4.7 Testing and Debugging

In Chapter 1, we discussed the problem-solving and implementation phases of computer

programming. Testing is an integral part of both phases. Testing in the problem-solving

phase occurs after the solution is developed but before it is implemented. In the imple-

mentation phase, we test after the algorithm is translated into code, and again after the

code has compiled successfully. The compilation itself constitutes another stage of test-

ing that is performed automatically.

Testing Strategies

When an individual programmer is designing and implementing an application, he or she can

find many software errors with pencil and paper.Desk checkingthe design solution is a very

common method of manually verifying a design or code. The programmer writes

down essential data (variables, input values, parameters of methods, and so on) and

walks through the design, manually simulating the actions of the computer and

recording changes in the data on paper. Portions of the design or code that are

complex or that are a source of concern should be double-checked.

Desk checking Tracing an

execution of a design or code

on paper

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