switch Expression and Case Labels in .NET

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664 switch Expression and Case Labels
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The expression evaluated by a switch can be arbitrarily complex In particular, the expression can define and intialize a variable:
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switch(int ival = get_response())
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In this case, ival is initialized, and the value of ival is compared with each case label The variableival exists throughout the entire switch statement but not outside it Case labels must be constant integral expressions (Section 27, p 62) For example, the following labels result in compile-time errors:
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// illegal case label values case 314: // noninteger case ival: // nonconstant
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It is also an error for any two case labels to have the same value
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665 Variable Definitions inside a switch
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Variables can be defined following only the last case or default label:
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Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 The reason for this rule is to prevent code that might jump over the definition and Pages: 912
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case true: // error: declaration precedes a case label C++ Primer, Fourth Edition string file_name = get_file_name(); By Stanley B Lippman,Jos e Lajoie, break; Barbara E Moo case false: //
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initialization of a variable
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Table of Contents | Index
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Recall that a variable can be used from its point of definition until the end of the block in which it is defined Now, consider what would happen if we could define a variable between two case labelsintroduction to standard C++continue to exist updated, reorganized, the rewritten to help That variable would has been completely until the end of and enclosing block It This popular tutorial could be used by code in case and use it in a more modern, effective wayJust was defined If since switch labels following the one in which it as C++ has evolved the the last programmers learn the language faster begins so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving executing in one of these subsequent case labels, then the variable might be used edition, even though it to write useful programs without first having to master every language detail Highlighting today's best had not been defined readers the means If we need to define a variable for a particular case, we can do so by defining the variable Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the inside a block, thereby ensuring that the variable can be used only where it is guaranteed to language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes have been defined and initialized:
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it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common case true: pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills { learned Authoritative and comprehensive statement within asource code for the book's extended examples is available on // ok: declaration in its coverageThe statement block the Web at the address below file_name = get_file_name(); string practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance
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// } break; case false: //
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C++ Primer, Fourth Edition By Stanley Lippman,Jos e Lajoie, 67 The whileBStatement Barbara E Moo Publisher:Addison Wesley Awhile statement repeatedly executes a target statement as long as a condition is true Its syntactic form isProfessional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 while (condition) Pages: 912
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statement Table of Contents | Index
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means to write useful programs without first having to master every language detail Highlighting today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Exercise There is one problem standard library Updated to teach the most current Classic Restructured for quicker learning, using the C++with our vowel-counting program as programming 67: styles and program design we've implemented it: It doesn't count capital letters as techniques Filled with new learning aids that emphasize important points, warn about common vowels Write and provide general counts Complete with and pitfalls, suggest good programming practices, a program that usage tipsboth lower- exercises that reinforce skills uppercase in its coverageThe source code for the book's extended examples is available on learned Authoritative and comprehensive letters as the appropriate vowelthat is, your program should count both 'a' and 'A' as part of aCnt, and the Web at the address below
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