A tHRow Expression in .NET

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6131 A tHRow Expression
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An exception is thrown using a throw expression, which consists of the keyword tHRow followed by an expression A throw expression is usually followed by a semicolon, making it into an expression statement The type of the expression determines what kind of exception is thrown As a simple example, recall the program on page 24 that added two objects of type Sales_item That program checked whether the records it read referred to the same book If not, it printed a message and exited
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Sales_item item1, item2; std::cin >> item1 >> item2; // first check thatitem1 and item2 represent the same book if (item1same_isbn(item2)) { std::cout << item1 + item2 << std::endl;
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return 0; // indicate success } else { std::cerr << "Data must refer to same ISBN" C++ Primer, std::endl; << Fourth Edition By -1; B indicate failure return Stanley//Lippman,Jos e Lajoie, Barbara E Moo }
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Publisher:Addison Wesley Professional In a less simple Pub Date: February 14, 2005 program that used Sales_items, the part that adds the objects might be Print ISBN: 0-201-72148-1 separated from the part that manages the interaction with a user In this case, we might Pages: 912 rewrite the test to throw an exception instead:
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Table of Contents | Index
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// first check that data is for the same item if (!item1same_isbn(item2)) This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help throw runtime_error("Data must refer to same ISBN"); programmers learn the language faster and use it theasame modern, effective wayJust as C++ has evolved since the last // ok, if we're still here the ISBNs are in more edition,std::cout << approach + teaching it They now introduce the C++ standard library from the beginning, giving so has the authors' item1 to item2 << std::endl;
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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 In this code weprevious editions, the the ISBNs differ If so, we discontinue concepts and techniques makes check whether book's authoritative discussion of fundamental C++ execution and transfer it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten control to a handler that will know how to handle this error 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 that expression is an object points, warn about common Athrow takes an expression In this case,learning aids that emphasize important of type runtime_error pitfalls, suggest good programming practices, and provide general usage tips Complete with and is that reinforce skills Theruntime_error type is one of the standard library exception types exercisesdefined in the learned Authoritative and comprehensive in its to say about these for the shortly We examples stdexcept header We'll have more coverageThe source codetypes book's extended create ais available on the Web at the address below runtime_error by giving it a string, which provides additional information about the kind of
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problem that occurred
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6132 The try Block
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The general form of a try block is
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try { program-statements } catch (exception-specifier) { handler-statements } catch (exception-specifier) { handler-statements } //
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ATRy block begins with the keyword try followed by a block enclosed in braces Following the TRy block is a list of one or more catch clauses A catch clause consists of three parts: the keywordcatch, the declaration of a single type or single object within parentheses (referred to as an exception specifier), and a block, which as usual must be enclosed in curly braces If the catch clause is selected to handle an exception, the associated block is executed Once the catch clause finishes, execution continues with the statement immediately following the last catch clause Theprogram-statements inside the TRy constitute the normal logic of the program They can contain any C++ statement, including declarations Like any block, a TRy block introduces a local scope, and variables declared within a try block cannot be referred to outside the try , including within the catch clauses
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