By Gary J Bronson; Marie Lee
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Extra resources for A first book of C++
13 and summarized in the following sections. 13 The development and design steps Step 1: Analyze the Problem The analysis of a problem can consist of up to two parts. The first part is a basic analysis that must be performed on all problems; it consists of extracting the complete input and output information supplied by the problems. For this analysis, you must: 1. Determine and understand the output items the program must produce. 2. Determine the input items. Together, these two items are referred to as the problem’s input/output (I/O).
8The derivation of this term is rather interesting. When a program stopped running on the Mark I at Harvard University in September 1945, Grace Hopper traced the malfunction to a dead insect that had gotten into the electrical circuits. She recorded the incident in her logbook as “Relay #70. . (moth) in relay. 1c 31 1/18/11 10:43 AM 32 Getting Started Because exhaustive testing isn’t feasible for most programs, different philosophies and methods of testing have evolved. At its most basic level, however, testing requires a conscious effort to make sure a program works correctly and produces meaningful results.
If so, an extended analysis might be necessary. An extended analysis simply means you must gather more information about the problem so that you thoroughly understand what’s being asked for and how to achieve the result. In this book, any additional information required to understand the problem is supplied along with the problem statement. Step 2: Develop a Solution Next, you select the exact set of steps, called the algorithm, to use for solving the problem. Typically, you find the solution by a series of refinements, starting with the initial algorithm you find in the analysis step, until you have an acceptable and complete algorithm.