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public class ProgramHelper : ICodeChecker { public ProgramHelper( ) // constructor { Console.WriteLine("Creating ProgramHelper"); } public string ConvertToCSharp(string stringToConvert) { Console.WriteLine("Converting the string you passed in to CSharp syntax"); return "This is a C# String."; } public string ConvertToVB(string stringToConvert) { Console.WriteLine("Converting the string you passed in to VB syntax"); return "This is a VB String."; } public bool CheckCodeSyntax(string stringToCheck, string whichLang) { switch (whichLang) { case "CSharp": Console.WriteLine("Checking the string for C# Syntax: {0}", stringToCheck); return true; case "VB": Console.WriteLine("Checking the string for VB Syntax: {0}", stringToCheck); return true; default: return false; } } // end class ProgramHelper

8-1-3 Data Element Descriptions In Sec 8-1-2 we listed traditional and essential characteristics of the attributes describing the data elements Schema entries which complement these essential but programming oriented characteristics will be listed in this section These schema entries provide information beyond the programs needs Recording the characteristics shown here can greatly improve the automatic and manual aspects of the database interface presented to the users

}

7

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Title A descriptive sentence or title may be desired which allows a more detailed identi cation of the data elements than the program language name permits Sometimes the title can also include abbreviations, synonyms, antonyms, or aliases Specialist in a subject area often use abbreviations unique to their eld of discourse when specifying a data element for entry or retrieval When data are shared among a larger audience, a full identi cation or title is required For example, the variable bp dst will have the title: "Diastolic bloodpressure, measured with patient sitting"

class Tester { public void Run( ) { // Create a ProgramHelper object ProgramHelper theProgramHelper = new ProgramHelper( ); // convert a line of CSharp to VB string cSharpString = theProgramHelper.ConvertToCSharp( "This is a VB string to convert."); Console.WriteLine(cSharpString);

Sec 8-1

Example A-36. One solution to Exercise 13-3 (continued)

A code or identi cation of the units of measurement for numeric data elements is often important It might be essential to know whether a pressure is stated in pounds force per square inch, atmospheric fractions, millibars, millimeters or inches of mercury, kilograms per square centimeter, pascals, or football players per quarterback The unit speci cation might be used only for reporting or veri cation of domain matching when les are joined, but could also be used to convert values automatically if the system has the necessary conversion factors available

Console.WriteLine("Checking the string for syntax... Result {0}", theProgramHelper.CheckCodeSyntax( cSharpString, "CSharp")); // convert the converted line back to VB string vbString = theProgramHelper.ConvertToVB(cSharpString); Console.WriteLine(vbString); Console.WriteLine("Checking the string for syntax... Result {0}", theProgramHelper.CheckCodeSyntax( vbString, "VB")); } static void Main( ) { Tester t = new Tester( ); t.Run( ); } } }

Essential Data An indication of whether this data element is essential or optional in the record may have to be maintained We may wish to prevent the creation of records which have critical elements missing An employee le needs to have a social security number and a departmental assignment for every employee Other elds, such as a spouse name or a health certi cation, may be optional

Solution to Exercise 13-4. Demonstrate the use of is and as. Create a new class, ProgramConverter, which implements IConvertible. ProgramConverter should implement the ConvertToCSharp( ) and ConvertToVB( ) methods. Revise ProgramHelper so that it derives from ProgramConverter and implements ICodeChecker. Test your class by creating an array of ProgramConverter objects, some of which are ProgramConverters and some of which are ProgramHelpers. Then call the conversion methods and the code check methods on each item in the array to test which ones implement ICodeChecker and which ones do not. For this exercise, you need to first define the new class ProgramConverter, and give it the ConvertToCSharp( ) and ConvertToVB( ) methods. Then derive ProgramHelper from ProgramConverter, You can remove the ConvertToCSharp( ) and ConvertToVB( ) methods from ProgramHelper, because they ll be inherited from ProgramConverter. In Run( ), you ll need to create the array of ProgramConverter objects, either manually, or randomly as we did in the chapter. Then use the is or as operator to test each element of the array to see which interfaces they implement. Example A-37 shows how we did it.

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If data can be missing or left unde ned, it becomes necessary that programs which operate on the database recognize this fact Unde ned values are due to several causes

Example A-37. Our solution to Exercise 13-4

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