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In glass-box testing, the advantages of modular program design become evident. Let us consider a typical example of a project involving 50 functions, each of which can involve 5 different cases or alternatives. If we were to test the whole program as one, we would need 550 test cases to be sure that each alternative was tested. Each module separately requires only 5 (easier) test cases, for a total of 5 × 50 = 250. Hence a problem of impossible size has been reduced to one that, for a large program, is of quite modest size.
Do not start to optimize code until it is complete and correct. Most programs spend 90 percent of their time doing 10 percent of their instructions. Find this 10 percent, and concentrate your efforts for efficiency there. Ramana Murthy Khammam 38 Chapter 1 • Programming Principles Another reason to think carefully before commencing optimization of a program is that optimizations often produce more complicated code. This code will then be harder to debug and to modify when necessary. Programming Precept Keep your algorithms as simple as you can.
Print( ); Both methods can be tested by running this driver and making sure that the configuration printed is the same as that given as input. 7 Program Tracing group discussion print statements for debugging After the functions have been assembled into a complete program, it is time to check out the completed whole. One of the most effective ways to uncover hidden defects is called a structured walkthrough. In this the programmer shows the completed program to another programmer or a small group of programmers and explains exactly what happens, beginning with an explanation of the main program followed by the functions, one by one.